JavaHelp.info http://www.javahelp.info tips & tricks for java and more Mon, 14 Feb 2011 10:05:36 +0000 en hourly 1 http://wordpress.org/?v=3.3 Quick-Start: SEAM-Framework and Maven without seam-gen http://www.javahelp.info/2011/02/14/quick-start-seam-framework-and-maven-without-seam-gen/ http://www.javahelp.info/2011/02/14/quick-start-seam-framework-and-maven-without-seam-gen/#comments Mon, 14 Feb 2011 09:54:01 +0000 Frank http://www.javahelp.info/?p=226 This short tutorial gives you the needed steps to integrate SEAM into an existing WAR-project or to build such a WAR from the beginning.

1. Including Dependencies

First of all you need to add the SEAM dependencies and of course JSF, if not already present:

		<dependency>
			<groupId>javax.faces</groupId>
			<artifactId>jsf-api</artifactId>
			<version>1.2_15</version>
		</dependency>
		<dependency>
			<groupId>javax.faces</groupId>
			<artifactId>jsf-impl</artifactId>
			<version>1.2_15</version>
		</dependency>
		<dependency>
			<groupId>com.sun.facelets</groupId>
			<artifactId>jsf-facelets</artifactId>
			<version>1.1.15.B1</version>
		</dependency>
		<dependency>
			<groupId>org.jboss.seam</groupId>
			<artifactId>jboss-seam</artifactId>
			<version>2.2.1.Final</version>
			<exclusions>
				<exclusion>
					<groupId>javax.el</groupId>
					<artifactId>el-api</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<dependency>
			<groupId>org.jboss.seam</groupId>
			<artifactId>jboss-seam-ui</artifactId>
			<version>2.2.1.Final</version>
		</dependency>

2. Modify web.xml

Here you have to add the FacesServlet for JSF, the Seam-Filter for SEAM and a Listener for SEAM. Additionally you can define some CONTEXT-variables for JSF / SEAM.

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	version="2.5">
	<!-- Context Variables -->
	<context-param>
		<param-name>facelets.SKIP_COMMENTS</param-name>
		<param-value>true</param-value>
	</context-param>
	<!-- Seam Listener -->
	<listener>
		<listener-class>org.jboss.seam.servlet.SeamListener</listener-class>
	</listener>
	<!-- Seam Filter -->
	<filter>
		<filter-name>Seam Filter</filter-name>
		<filter-class>org.jboss.seam.servlet.SeamFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>Seam Filter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- JSF Servlet -->
	<servlet>
		<servlet-name>Faces Servlet</servlet-name>
		<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>Faces Servlet</servlet-name>
		<url-pattern>*.html</url-pattern>
	</servlet-mapping>
	<!-- Seam Resource Servlet -->
	<servlet>
		<servlet-name>Seam Resource Servlet</servlet-name>
		<servlet-class>org.jboss.seam.servlet.SeamResourceServlet</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>Seam Resource Servlet</servlet-name>
		<url-pattern>/seam/resource/*</url-pattern>
	</servlet-mapping>
</web-app>

3. Configure JSF

Then you have to add an faces-config.xml to the WEB-INF directory.

<?xml version="1.0" encoding="UTF-8"?>
<faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xi="http://www.w3.org/2001/XInclude"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">
</faces-config>

4. Configure SEAM
Just add some empty configuration files to enable seam for your WAR.

<?xml version="1.0" encoding="UTF-8"?>
<components xmlns="http://jboss.com/products/seam/components"
	xmlns:core="http://jboss.com/products/seam/core" xmlns:transaction="http://jboss.com/products/seam/transaction"
	xmlns:web="http://jboss.com/products/seam/web" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<core:init debug="false" />
</components>

And also put an empty seam.properties to your classpath (in directory src/main/resources).

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]]> http://www.javahelp.info/2011/02/14/quick-start-seam-framework-and-maven-without-seam-gen/feed/ 2 Using MDB-Topic as cluster-wide event listener http://www.javahelp.info/2011/02/07/using-mdb-topic-as-cluster-wide-event-listener/ http://www.javahelp.info/2011/02/07/using-mdb-topic-as-cluster-wide-event-listener/#comments Mon, 07 Feb 2011 14:30:34 +0000 Frank http://www.javahelp.info/?p=213 Yesterday I had the problem that I need to send a broadcast message in an application which should be processed by every running node. This message should be the initiator to clear a local cache on each node. So I had the idea to use JMS as API using a topic and every node will listen on that topic. I am using this on JBoss 5.1.0.GA.

First of all the need to define an Topic. This could be done in an own service.xml, which is located directly in the deploy directory or (my preferred way) in the ear.

?Download topic-service.xml
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< ?xml version="1.0" encoding="UTF-8"?>
<server>
	<mbean code="org.jboss.jms.server.destination.TopicService"
		name="jboss.messaging.destination:service=Topic,name=MyEvents"
		xmbean-dd="xmdesc/Topic-xmbean.xml">
		<depends optional-attribute-name="ServerPeer">
			jboss.messaging:service=ServerPeer
		 </depends>
		<depends>
			jboss.messaging:service=PostOffice</depends>
		<attribute name="Clustered">true</attribute>
	</mbean>
 
</server>

Especially the attribute “Clustered” is important. Otherwise you would only have a local topic and not a cluster-wide.

Next we have to define our listener:

?Download ClusterEventsListener.java
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@MessageDriven(activationConfig = {
		@ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Topic"),
		@ActivationConfigProperty(propertyName = "destination", propertyValue = "topic/MyEvents") }, messageListenerInterface = MessageListener.class)
@Depends(value = { "jboss.messaging:service=PostOffice",
		"jboss.messaging.destination:name=MyEvents,service=Topic" })
public class ClusterEventsListener implements MessageListener {
 
	public void onMessage(Message message) {
              //do some stuff
              System.out.println("received an event");
	}
}

That’s all, now you can easily send some events using standard JMS commands, for example:

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@Stateless
public class SendEventImpl implements SendEvent {
 
	@Resource(mappedName = "topic/MyEvents")
	private Topic eventTopic;
 
	@Resource(mappedName = "ConnectionFactory")
	private TopicConnectionFactory eventQueueFactory;
 
	public void sendEvent() {
		try {
			TopicConnection cnn = null;
			TopicSession sess = null;
			TopicPublisher publisher = null;
			try {
				cnn = eventQueueFactory.createTopicConnection();
				sess = cnn.createTopicSession(false,
						TopicSession.AUTO_ACKNOWLEDGE);
 
				publisher = sess.createPublisher(eventTopic);
				TextMessage message = sess.createTextMessage("hello world");
				publisher.send(message);
			} finally {
				try {
					if (publisher != null)
						publisher.close();
				} catch (Throwable e) {
					log.error("closing sender", e);
				}
				try {
					if (sess != null)
						sess.close();
				} catch (Throwable e) {
					log.error("closing session", e);
				}
				try {
					if (cnn != null)
						cnn.close();
				} catch (Throwable e) {
					log.error("closing connection", e);
				}
			}
		} catch (JMSException e) {
			throw new RuntimeException(e);
		}
	}
}

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]]> http://www.javahelp.info/2011/02/07/using-mdb-topic-as-cluster-wide-event-listener/feed/ 0 @OneToOne reversemapping and lazy loading http://www.javahelp.info/2011/01/24/onetoone-reversemapping-and-lazy-loading/ http://www.javahelp.info/2011/01/24/onetoone-reversemapping-and-lazy-loading/#comments Mon, 24 Jan 2011 12:29:20 +0000 Frank http://www.javahelp.info/?p=205 Using JPA or especially Hibernate for mapping database tables to POJOs is quite comfortable. An essential feature here is lazy loading of constraints between objects. Unfortunately this didn’t work out of the box for reversed @OntToOne relations.
For example you have two classes:

?View Code JAVA
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public class A {
   @OneToOne(fetch=FetchType.LAZY)
   private B foo;
}
 
public class B {
    @OneToOne(mappedBy = "foo", fetch = FetchType.LAZY)
    private A bar;
 
    public A getBar() {
        return bar;
    }
}

If you now load B from the database Hibernate needs to look if A also exists, because Hibernate needs to know if “bar” is null or not. In this case the parameter “fetch” has no effect. There are two known possible solutions to solve this problem:

  1. Implement the “bar” relation as @OneToMany with a collection and implement getBar as you needed. But if you need this relation in complex queries you could have problems to define the correct HQL.
  2. You use Bytecode instrumentation to realize a real lazy loading behaviour. In this case you have to add the following annotation to the property “bar”: @LazyToOne(LazyToOneOption.NO_PROXY)

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]]> http://www.javahelp.info/2011/01/24/onetoone-reversemapping-and-lazy-loading/feed/ 0 Using JAXB for configuration-files http://www.javahelp.info/2010/12/07/using-jaxb-for-configuration-files/ http://www.javahelp.info/2010/12/07/using-jaxb-for-configuration-files/#comments Tue, 07 Dec 2010 16:07:55 +0000 Frank http://www.javahelp.info/?p=198 After a long break, I write again some tips and hints about Java programming.
Today I had again the problem that I need some configurable parameteres in an application. One way could be the usage of the Properties-API. But this only give us a very flat model.
In my eyes a better solution is to use XML. But this is very komplex to parse using DOM or SAX. So we can use some Binding-APIs to bind Java-Code to XML and vise versa.
One solution is XMLBeans, which I used in past. But from Java 6 on JAXB is included and so no extra library is needed.

So we start writing our Model in Java (I named it “Config”):

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@XmlRootElement(name = "config", namespace = Config.NAMESPACE)
public class Config {
 
	public static final String NAMESPACE = "http://www.javahelp.info/test/config";
 
	private String host;
 
	@XmlElement(namespace = NAMESPACE)
	public String getHost() {
		return host;
	}
 
	public void setHost(String host) {
		this.host = host;
	}
}

That’s all. From now an you can read the config from a file with the following code:

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JAXBContext context = JAXBContext.newInstance(Config.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
//skip validation
unmarshaller.setSchema(null);
Config config = (Config) unmarshaller.unmarshal(new File("config.xml"));

And you also can write a in-memory-config:

?View Code JAVA
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Config config = new Config();
config.setHost("localhost");
 
JAXBContext context = JAXBContext.newInstance(Config.class);
Marshaller marshaller = context.createMarshaller();
marshaller.marshal(config, new File("config.xml"));

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]]> http://www.javahelp.info/2010/12/07/using-jaxb-for-configuration-files/feed/ 0 Get the right dependencies for JBoss 5 Client and Maven http://www.javahelp.info/2010/01/27/get-the-right-dependencies-for-jboss-5-client-and-maven/ http://www.javahelp.info/2010/01/27/get-the-right-dependencies-for-jboss-5-client-and-maven/#comments Wed, 27 Jan 2010 16:34:33 +0000 Frank http://www.javahelp.info/?p=188 The last days my task was to port a very complex JBoss-Application from JBoss 4.2 to 5.1.0 GA. The Application has a couple of EJBs and many logic (Stateless-Beans, Stateful-Beans, Service-MBeans, etc.), a complex Web-Application built on top of Seam 2.1 and some simple Java-Clients accessing the provided businesslogic as a JBoss Client.

The whole application is built with maven.

In the past I imported the jbossall-client.jar directly into my Maven Repository. But I thought JBoss.org provides the used JARs via the repository http://repository.jboss.org/maven2/. The right package would be:

?View Code XML
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<dependency>
    <groupid>org.jboss.jbossas</groupid>
    <artifactid>jboss-as-client</artifactid>
    <version>5.1.0.GA</version>
</dependency>

But this sounds better as it really is. Because of the transitive dependencies of some used packages, nearly the whole JBoss-Server is included. The developers of the JBoss-Servers sometimes using classifiers instead of splitting a mega-jar into several sub-jars. For example the org.jboss.jbossas:jboss-as-server artifact.
One solution would be to repackage all needed JARs to one JAR.
For me the solution was to build my own jboss-as-client, using a self-made pom with all needed dependencies. Because this is more the maven-way. But what is needed? This is quite easy. I tried to find the correct artifacts of the jar-files which are referenced by the jbossall-client.jar, delivered with the JBoss 5.1.0 release.

All transitive dependencies are excluded, to avoid the described problem.

If you have any suggestions how to optimize it or if I have something missed, please let me know.

And here is the result:

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	<version>5.0.1.GA</version>
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			<artifactid>hibernate-commons-annotations</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.hibernate</groupid>
			<artifactid>hibernate-core</artifactid>
		</exclusion>
		<exclusion>
			<groupid>dom4j</groupid>
			<artifactid>dom4j</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.naming</groupid>
	<artifactid>jnp-client</artifactid>
	<version>5.0.3.GA</version>
</dependency>
<dependency>
	<groupid>oswego-concurrent</groupid>
	<artifactid>concurrent</artifactid>
	<version>1.3.4-jboss-update1</version>
</dependency>
<dependency>
	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-proxy-clustered</artifactid>
	<version>1.0.1</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-proxy-impl</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-proxy-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-api</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-proxy-spi</artifactid>
	<version>1.0.0</version>
	<classifier>client</classifier>
</dependency>
<dependency>
 	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-proxy-impl</artifactid>
	<version>1.0.2</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.aspects</groupid>
			<artifactid>jboss-remoting-aspects</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-common</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-proxy-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-interceptors</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.naming</groupid>
			<artifactid>jnpserver</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
 	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-core</artifactid>
	<version>1.1.5</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>javassist</groupid>
			<artifactid>javassist</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.hibernate</groupid>
			<artifactid>hibernate</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.hibernate</groupid>
			<artifactid>hibernate-entitymanager</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-jca-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jboss-vfs</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.aop</groupid>
			<artifactid>jboss-aop</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.aop</groupid>
			<artifactid>jboss-aop-aspects</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cache</groupid>
			<artifactid>jbosscache-core</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-cache</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-endpoint</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-security</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-timerservice-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-ext-api-impl</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-proxy-clustered</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-transactions</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-ejb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jacc-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jca-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jms-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jpa</groupid>
			<artifactid>jboss-jpa-deployers</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.microcontainer</groupid>
			<artifactid>jboss-kernel</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.security</groupid>
			<artifactid>jbosssx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ws</groupid>
			<artifactid>jbossws-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>quartz</groupid>
			<artifactid>quartz</artifactid>
		</exclusion>
		<exclusion>
			<groupid>sun-jaxws</groupid>
			<artifactid>jaxws-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>sun-jaxws</groupid>
			<artifactid>jsr181-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>trove</groupid>
			<artifactid>trove</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.aspects</groupid>
			<artifactid>jboss-remoting-aspects</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-common</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-interceptors</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-proxy-impl</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-proxy-spi</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.remoting</groupid>
	<artifactid>jboss-remoting</artifactid>
	<version>2.5.1</version>
</dependency>
<dependency>
	<groupid>org.jboss.deployers</groupid>
	<artifactid>jboss-deployers-core-spi</artifactid>
	<version>2.0.7.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.deployers</groupid>
	<artifactid>jboss-deployers-core</artifactid>
	<version>2.0.7.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-main</artifactid>
	<version>5.1.0.GA</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.bootstrap</groupid>
			<artifactid>jboss-bootstrap</artifactid>
		</exclusion>
		<exclusion>
			<groupid>gnu-getopt</groupid>
			<artifactid>getopt</artifactid>
		</exclusion>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.logbridge</groupid>
			<artifactid>jboss-logbridge</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-j2se</artifactid>
	<version>5.1.0.GA</version>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-classloading-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>apache-xerces</groupid>
			<artifactid>xml-apis</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-ext-api</artifactid>
	<version>1.0.0</version>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-ejb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-server</artifactid>
	<version>5.1.0.GA</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>sun-jaxb</groupid>
			<artifactid>jaxb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-deployment</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.bootstrap</groupid>
			<artifactid>jboss-bootstrap</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-deployment-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jpa</groupid>
			<artifactid>jboss-jpa-deployers</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.security</groupid>
			<artifactid>jbosssx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-security</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-transaction-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jacc-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jms-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ws.native</groupid>
			<artifactid>jbossws-native-saaj</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ws.native</groupid>
			<artifactid>jbossws-native-jaxws</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javax.security</groupid>
			<artifactid>jaas</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jca-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>bcel</groupid>
			<artifactid>bcel</artifactid>
		</exclusion>
		<exclusion>
			<groupid>jpl-util</groupid>
			<artifactid>jpl-util</artifactid>
		</exclusion>
		<exclusion>
			<groupid>jpl-pattern</groupid>
			<artifactid>jpl-pattern</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jbossxb</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.naming</groupid>
			<artifactid>jnp-server</artifactid>
		</exclusion>
		<exclusion>
			<groupid>gnu-getopt</groupid>
			<artifactid>getopt</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-ejb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.naming</groupid>
			<artifactid>jnpserver</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-security</artifactid>
	<version>1.0.0</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.aspects</groupid>
			<artifactid>jboss-current-invocation-aspects</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-interceptors</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.security</groupid>
			<artifactid>jbosssx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jacc-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-ext-api-impl</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.aop</groupid>
			<artifactid>jboss-aop</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ejb3</groupid>
			<artifactid>jboss-ejb3-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.security</groupid>
	<artifactid>jbosssx-client</artifactid>
	<version>2.0.3.SP1</version>
</dependency>
<dependency>
	<groupid>org.jboss.deployers</groupid>
	<artifactid>jboss-deployers-client</artifactid>
	<version>2.0.7.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.deployers</groupid>
	<artifactid>jboss-deployers-client-spi</artifactid>
	<version>2.0.7.GA</version>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.man</groupid>
			<artifactid>jboss-managed</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-system-jmx</artifactid>
	<version>5.1.0.GA</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>apache-xerces</groupid>
			<artifactid>xml-apis</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jboss-vfs</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jbossxb</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.deployers</groupid>
			<artifactid>jboss-deployers-impl</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.deployers</groupid>
			<artifactid>jboss-deployers-structure-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.deployers</groupid>
			<artifactid>jboss-deployers-vfs</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.deployers</groupid>
			<artifactid>jboss-deployers-vfs-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.bootstrap</groupid>
			<artifactid>jboss-bootstrap</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.microcontainer</groupid>
			<artifactid>jboss-dependency</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.microcontainer</groupid>
			<artifactid>jboss-kernel</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.slf4j</groupid>
	<artifactid>slf4j-jboss-logging</artifactid>
	<version>1.0.2.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.logging</groupid>
	<artifactid>jboss-logging-jdk</artifactid>
	<version>2.1.0.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.logging</groupid>
	<artifactid>jboss-logging-log4j</artifactid>
	<version>2.1.0.GA</version>
	<exclusions>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.logging</groupid>
	<artifactid>jboss-logging-spi</artifactid>
	<version>2.1.0.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.ejb3</groupid>
	<artifactid>jboss-ejb3-common</artifactid>
	<version>1.0.0</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.microcontainer</groupid>
			<artifactid>jboss-kernel</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.deployers</groupid>
			<artifactid>jboss-deployers-spi</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-server</artifactid>
	<version>5.1.0.GA</version>
	<classifier>jmx-invoker-adaptor-client</classifier>
	<exclusions>
		<exclusion>
			<groupid>sun-jaxb</groupid>
			<artifactid>jabx-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-deployment</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.bootstrap</groupid>
			<artifactid>jboss-bootstrap</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-deployment-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jpa</groupid>
			<artifactid>jbopss-jpa-deployers</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.security</groupid>
			<artifactid>jbosssx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-ejb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-security</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-transaction-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jacc-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-jms-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ws.native</groupid>
			<artifactid>jbossws-native-saaj</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.ws.native</groupid>
			<artifactid>jbossws-native-jaxws</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javax.security</groupid>
			<artifactid>jaas</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jca-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>bcel</groupid>
			<artifactid>bcel</artifactid>
		</exclusion>
		<exclusion>
			<groupid>jpl-util</groupid>
			<artifactid>jpl-util</artifactid>
		</exclusion>
		<exclusion>
			<groupid>jpl-pattern</groupid>
			<artifactid>jpl-pattern</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jbossxb</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.naming</groupid>
			<artifactid>jnpserver</artifactid>
		</exclusion>
		<exclusion>
			<groupid>gnu-getopt</groupid>
			<artifactid>getopt</artifactid>
		</exclusion>
		<exclusion>
			<groupid>sun-jaxb</groupid>
			<artifactid>jaxb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jpa</groupid>
			<artifactid>jboss-jpa-deployers</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-jms-api</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-management</artifactid>
	<version>5.1.0.GA</version>
	<classifier>jsr77-client</classifier>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.deployers</groupid>
			<artifactid>jboss-deployers-vfs</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.microcontainer</groupid>
			<artifactid>jboss-kernel</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cl</groupid>
			<artifactid>jboss-classloading-vfs</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-server</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.bootstrap</groupid>
			<artifactid>jboss-bootstrap</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-connector</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-cluster</artifactid>
		</exclusion>
		<exclusion>
			<groupid>apache-xerces</groupid>
			<artifactid>xml-apis</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-iiop</artifactid>
	<version>5.1.0.GA</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>apache-avalon</groupid>
			<artifactid>avalon-framework</artifactid>
		</exclusion>
		<exclusion>
			<groupid>apache-xerces</groupid>
			<artifactid>xml-apis</artifactid>
		</exclusion>
		<exclusion>
			<groupid>jacorb</groupid>
			<artifactid>jacorb</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javax.security</groupid>
			<artifactid>jaas</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javax.transcation</groupid>
			<artifactid>jta</artifactid>
		</exclusion>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-classloading-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-corba-ots-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.integration</groupid>
			<artifactid>jboss-transaction-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.javaee</groupid>
			<artifactid>jboss-ejb-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-main</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-server</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-security</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.metadata</groupid>
			<artifactid>jboss-metadata</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javax.transaction</groupid>
			<artifactid>jta</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.cluster</groupid>
	<artifactid>jboss-ha-client</artifactid>
	<version>1.1.1.GA</version>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.aspects</groupid>
			<artifactid>jboss-remoting-aspects</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.jbossas</groupid>
	<artifactid>jboss-as-cluster</artifactid>
	<version>5.1.0.GA</version>
	<classifier>jboss-ha-legacy-client</classifier>
	<exclusions>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-server</artifactid>
		</exclusion>
		<exclusion>
			<groupid>jgroups</groupid>
			<artifactid>jgroups</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-api</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-cache-spi</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-jbc</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.cluster</groupid>
			<artifactid>jboss-ha-server-cache-jbc</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system-jmx</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.jbossas</groupid>
			<artifactid>jboss-as-system</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.bootstrap</groupid>
			<artifactid>jboss-bootstrap</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javax.transaction</groupid>
			<artifactid>jta</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.slf4j</groupid>
	<artifactid>slf4j-api</artifactid>
	<version>1.5.6</version>
</dependency>
<dependency>
	<groupid>org.jboss.aop</groupid>
	<artifactid>jboss-aop</artifactid>
	<version>2.1.1.GA</version>
	<classifier>client</classifier>
	<exclusions>
		<exclusion>
			<groupid>apache-xerces</groupid>
			<artifactid>xml-apis</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.apache.ant</groupid>
			<artifactid>ant</artifactid>
		</exclusion>
		<exclusion>
			<groupid>javassist</groupid>
			<artifactid>javassist</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jboss-reflect</artifactid>
		</exclusion>
		<exclusion>
			<groupid>qdox</groupid>
			<artifactid>qdox</artifactid>
		</exclusion>
		<exclusion>
			<groupid>trove</groupid>
			<artifactid>trove</artifactid>
		</exclusion>
		<exclusion>
			<groupid>log4j</groupid>
			<artifactid>log4j</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss</groupid>
	<artifactid>jboss-common-core</artifactid>
	<version>2.2.14.GA</version>
</dependency>
<dependency>
	<groupid>org.jboss.security</groupid>
	<artifactid>jboss-security-spi</artifactid>
	<version>2.0.3.SP1</version>
</dependency>
<dependency>
	<groupid>org.jboss</groupid>
	<artifactid>jboss-mdr</artifactid>
	<version>2.0.1.GA</version>
	<exclusions>
		<exclusion>
			<groupid>org.jboss</groupid>
			<artifactid>jboss-reflect</artifactid>
		</exclusion>
	</exclusions>
</dependency>
<dependency>
	<groupid>org.jboss.client</groupid>
	<artifactid>jboss-client</artifactid>
	<version>5.1.0.CR1</version>
</dependency>
<dependency>
	<groupid>org.apache</groupid>
	<artifactid>xmlsec</artifactid>
	<version>1.4.2</version>
</dependency>
<dependency>
	<groupid>commons-logging</groupid>
	<artifactid>commons-logging</artifactid>
	<version>1.1.0.jboss</version>
</dependency>
<dependency>
	<groupid>org.jboss.integration</groupid>
	<artifactid>jboss-integration</artifactid>
	<version>5.1.0.GA</version>
</dependency>
<dependency>
	<groupid>jboss</groupid>
	<artifactid>jboss-serialization</artifactid>
	<version>1.0.3.GA</version>
</dependency>
<dependency>
	<groupid>org.hibernate</groupid>
	<artifactid>ejb3-persistence</artifactid>
	<version>1.0.2.GA</version>
</dependency>
<!-- andere libs -->
<dependency>
	<groupid>org.jboss.aspects</groupid>
	<artifactid>jboss-remoting-aspects</artifactid>
	<version>1.0.2</version>
	<exclusions>
		<exclusion>
			<groupid>org.jboss.aop</groupid>
			<artifactid>jboss-aop</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.microcontainer</groupid>
			<artifactid>jboss-kernel</artifactid>
		</exclusion>
		<exclusion>
			<groupid>org.jboss.security</groupid>
			<artifactid>jbosssx</artifactid>
		</exclusion>
	</exclusions>
</dependency>	
<dependency>
	<groupid>javassist</groupid>
	<artifactid>javassist</artifactid>
	<version>3.10.0.GA</version>
</dependency>

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]]> http://www.javahelp.info/2010/01/27/get-the-right-dependencies-for-jboss-5-client-and-maven/feed/ 3 Maven: “Error installing metadata” http://www.javahelp.info/2009/12/10/maven-error-installing-metadata/ http://www.javahelp.info/2009/12/10/maven-error-installing-metadata/#comments Thu, 10 Dec 2009 17:02:14 +0000 Frank http://www.javahelp.info/?p=186 Today I had a problem compiling and installing a simple maven project.
Every time I ran “mvn install” I received the following error:

Error installing artifact's metadata: Error installing metadata:
Error updating group repository metadata
input contained no data

The problem here was an empty maven-metadata-local.xml in my local repository of the artifact I wanted to install. After completely removing this artifact from my repository an install was possible.

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]]> http://www.javahelp.info/2009/12/10/maven-error-installing-metadata/feed/ 13 Using reflection with arrays and primitive types http://www.javahelp.info/2009/11/30/using-reflection-with-arrays-and-primitive-types/ http://www.javahelp.info/2009/11/30/using-reflection-with-arrays-and-primitive-types/#comments Mon, 30 Nov 2009 20:10:18 +0000 Frank http://www.javahelp.info/?p=162 Sometimes it is necessary to handle a parameter of type object different for the real type. So you have to use instanceof to determine the type of an object. If you are need to check if it is an array, you can use the Reflection-API provided by the JRE. The Reflection API is a comfortable and rich functional API to inspect and manipulate Objects at runtime. One example could be to access private fields at runtime.

I had the problem to serialize some variables to JavaScript, so I wrote me a simple function:

?View Code JAVA
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public void objectToJavaScript(Object object, StringBuffer buf);

If the given object is primitive I would simple add it to the provided StringBuffer, but if it is an array I need to output ‘[' and ']‘ with the given parameters. So I have to check if the object is an array:

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public void objectToJavaScript(Object object, StringBuffer buf) {
    if (object == null) {
        buf.append("null");
        return;
    }
    ... //other types
    if (object.getClass().isArray()) {
        buf.append('[');
        //TODO output array content
        buf.append(']');
        return;
    }
    ...
}

But how to access each entry of the array? One way could be to cast the object to Object[]. Unfortunately
if the array is an array of primtive types this would throw a ClassCastException. So we have to use the functions, provided by java.lang.reflect.Array. The full code looks like:

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public void objectToJavaScript(Object object, StringBuffer buf) {
    if (object == null) {
        buf.append("null");
        return;
    }
    ... //other types
    if (object.getClass().isArray()) {
        buf.append('[');
        int len = java.lang.reflect.Array.getLength(object);
        for(int i = 0; i &lt; len; i++) {
            if (i &gt; 0) buf.append(',');
            objectToJavaScript(java.lang.reflect.Array.get(object, i), buf);
        }
        buf.append(']');
        return;
    }
    ...
}

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]]> http://www.javahelp.info/2009/11/30/using-reflection-with-arrays-and-primitive-types/feed/ 0 JavaScript – events with parameters http://www.javahelp.info/2009/11/28/javascript-events-with-parameters/ http://www.javahelp.info/2009/11/28/javascript-events-with-parameters/#comments Sat, 28 Nov 2009 16:57:15 +0000 Frank http://www.javahelp.info/?p=158 If you use JavaScript to put some dynamic to your websites you often have the problem to pass parameters to the event-function. One solution is to use closures. With the element of closures you can access outer variables from inner inline functions.

One example would be:

?View Code JAVASCRIPT
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var ps = document.getElementyByTagName("p");
for(var i = 0; i &lt; ps .length; i++) {
    ps[i].onclick = function (event) {
        window.alert("you clicked the element with index "+i);
    }
}

You would assume that the first Element would say “…element with index 0″ and the second “…element with index 1″. Unfortunaly all p-tags will say “…element with index 10″ if you have 10 tags on the site. The reason is that i is modified later and is directly referenced to the inner-function. So you have to modify the code as follows:

?View Code JAVASCRIPT
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var ps = document.getElementyByTagName("p");
for(var i = 0; i &lt; ps .length; i++) {
    ps[i].onclick = function(param) { 
            return function (event) {
                window.alert("you clicked the element with index "+param);
            }
        }(i);
    }
}

Here I wrapped the event with a outer function which provides the parameter (i) as a new reference. So the first p-tag will say “…element with index 0″, the second “…element with index 1″ and so on.

But there exists one unfortunately trap. You will reference the “ps”-Variable with your event-function and this parameter could not be removed by the garbage collector. So we have to modify the code:

?View Code JAVASCRIPT
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function generateevent(param) {
    return function (event) {
        window.alert("you clicked the element with index "+param);
    }
}
var ps = document.getElementyByTagName("p");
for(var i = 0; i &lt; ps .length; i++) {
    ps[i].onclick = generateevent(param);
}

A also perfect other solution is provided by some JavaScript-frameworks like JQuery. Here you can use the event method “bind” or the data method “data” to bind specific data to an function:

?View Code JAVASCRIPT
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function event(param) {
        window.alert("you clicked the element with index "+param.data);
}
 
var ps = $("p");
for(var i = 0; i &lt; ps .length; i++) {
    $(ps[i]).bind("click", i, event);
}

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]]> http://www.javahelp.info/2009/11/28/javascript-events-with-parameters/feed/ 0 comfortable thread pools using java.util.concurrent http://www.javahelp.info/2009/11/12/comfortable-thread-pools-using-java-util-concurrent/ http://www.javahelp.info/2009/11/12/comfortable-thread-pools-using-java-util-concurrent/#comments Thu, 12 Nov 2009 12:14:34 +0000 Frank http://www.javahelp.info/?p=146 Today I had another time the problem to execute many short tasks in a thread pooled environment. One way could be to write the pooling itselfs (like the other times in history ;) ). But I thought: Why to reinvent the wheel every time and not using standardized libraries like the java.util.concurrent.*?

What I want:

  • A self enlarging and shrinking ThreadPool depending on the queued tasks. (Because sometimes it is nothing to do and sometimes it could be to get many hundreds of tasks in a short time)
  • A definable Limit of maximum running Threads (Because we cannot create hundreds of threads just for this task. Keep in mind: the tasks have a short run time)
  • Queuing the Tasks to run later, if the ThreadPool has reached the given limits

So I looked at the given Examples and the Executors-Class, which provides fast and simple methods:

  1. newCachedThreadPool : This looks good, but unfortunately you can’t define a maximum limit of threads.
  2. newFixedThreadPool : This handles the wanted limitation, but not the automatic enlarging and shrinking.

So we cannot use the predefined methods and need to instantiate ThreadPoolExecutor directly.

The simple Constructor is:
public ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue workQueue)

Here we can define the minimum pool size (would be zero) and the maximum pool size (for example 5). The keepAliveTime and unit would be the time a idle thread will wait for new jobs, until it will be terminated. The given WorkQueue handles all jobs, which cannot executed directly. So the best Java provided BlockingQueue would be LinkedBlockingQueue. This queue holds up to a given count (for us unlimited) jobs. Unfortunately the result is not the wanted. The ThreadPoolExecutor only uses the threads in the core pool and ignores the maximumPoolSize.

If a new task should be executed, the ThreadPoolExecutor will try the following:

  1. If the ThreadPoolExecutor is not running, the job will be rejected
  2. If the current pool size is under the core pool size a new thread is created
  3. The job will be queued in the work queue (using BlockingQueue.offer)
  4. If not possible a new thread is created up to max pool size
  5. otherwise the job will be rejected

The problem here is that step 3 and 4 are unfortunately changed as I expected. (We wanted result would be use as many threads as possible up to the limit and otherwise queue it).But it is correct, because the running threads uses the work queue to get the following jobs they should do. Because we want to give the job to idle threads first and create new otherwise.

So one solution could be a SynchronousQueue which only accept a job if a idle thread is waiting. But if all threads are busy the ThreadPoolExecutor will reject the Job. So I had to implement an own BlockQueue.

To implement the right way and honour the ThreadPoolExecutor-Implementation, we Queue should only accept a new job, if an idle thread is waiting. But instead of rejecting the the job, the job should be queued. The result is the following implementation of my BufferedBlockingQueue and the associated BufferedBlockingQueueRejectedExecutionHandler.

?View Code JAVA
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public class BufferedBlockingQueue< E > implements BlockingQueue< E > {
 
    private Queue< E > queue = new LinkedList< E >();
 
    private int inWait = 0;
 
    public synchronized boolean add(E o) {
        boolean result = queue.add(o);
        if (result && inWait > 0)
            notify();
        return result;
    }
 
    public int drainTo(Collection< ? super E > c) {
        return drainTo(c, Integer.MAX_VALUE);
    }
 
    public synchronized int drainTo(Collection< ? super E > c, int maxElements) {
        int n = 0;
        while (!queue.isEmpty() && maxElements > 0) {
            c.add(queue.poll());
            n++;
        }
        return n;
    }
 
    public synchronized boolean offer(E o) {
        if (inWait == 0)
            return false;
        return add(o);
    }
 
    public boolean offer(E o, long timeout, TimeUnit unit)
            throws InterruptedException {
        if (inWait == 0)
            return false;
        return add(o);
    }
 
    public synchronized E poll(long timeout, TimeUnit unit)
            throws InterruptedException {
        if (queue.isEmpty()) {
            inWait++;
            try {
                wait(unit.toMillis(timeout));
            } finally {
                inWait--;
            }
        }
        return queue.poll();
    }
 
    public synchronized void put(E o) throws InterruptedException {
        queue.add(o);
        notify();
    }
 
    public int remainingCapacity() {
        return Integer.MAX_VALUE;
    }
 
    public synchronized E take() throws InterruptedException {
        return poll(0, TimeUnit.MILLISECONDS);
    }
 
    public synchronized E element() {
        return queue.element();
    }
 
    public synchronized E peek() {
        return queue.peek();
    }
 
    public synchronized E poll() {
        return queue.poll();
    }
 
    public synchronized E remove() {
        return queue.remove();
    }
 
    public synchronized boolean addAll(Collection< ? extends E > c) {
        notify();
        return addAll(c);
    }
 
    public synchronized void clear() {
        queue.clear();
    }
 
    public synchronized boolean contains(Object o) {
        return queue.contains(o);
    }
 
    public synchronized boolean containsAll(Collection< ? > c) {
        return queue.containsAll(c);
    }
 
    public synchronized boolean isEmpty() {
        return queue.isEmpty();
    }
 
    public synchronized Iterator< E > iterator() {
        return queue.iterator();
    }
 
    public synchronized boolean remove(Object o) {
        return queue.remove(o);
    }
 
    public synchronized boolean removeAll(Collection< ? > c) {
        return queue.removeAll(c);
    }
 
    public synchronized boolean retainAll(Collection< ? > c) {
        return queue.retainAll(c);
    }
 
    public synchronized int size() {
        return queue.size();
    }
 
    public synchronized Object[] toArray() {
        return queue.toArray();
    }
 
    public synchronized < T > T[] toArray(T[] a) {
        return queue.toArray(a);
    }
 
}
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public class BufferedBlockingQueueRejectedExecutionHandler implements
        RejectedExecutionHandler {
 
    @SuppressWarnings("unchecked")
    public void rejectedExecution(Runnable r, ThreadPoolExecutor executor) {
        if (executor.isShutdown())
            throw new RejectedExecutionException();
        BlockingQueue< Runnable > blockingQueue = executor.getQueue();
        if (!(blockingQueue instanceof BufferedBlockingQueue)) {
            throw new RejectedExecutionException();
        }
        BufferedBlockingQueue< Runnable > queue = (BufferedBlockingQueue< Runnable >) blockingQueue;
        queue.add(r);
    }
 
}

The final constructor for the thread pool is:

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Executor pool = new ThreadPoolExecutor(0, 5, 60, TimeUnit.SECONDS, 
                       new BufferedBlockingQueue< Runnable >(), 
                       new BufferedBlockingQueueRejectedExecutionHandler());

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]]> http://www.javahelp.info/2009/11/12/comfortable-thread-pools-using-java-util-concurrent/feed/ 0 Preloading Images with JavaScript http://www.javahelp.info/2009/11/06/preloading-images-with-javascript/ http://www.javahelp.info/2009/11/06/preloading-images-with-javascript/#comments Fri, 06 Nov 2009 16:50:40 +0000 Frank http://www.javahelp.info/?p=140 Sometimes in a complex javascript-application you want to display an image when it is fully loaded. Until then you want to show for example a common loading-imageAjax Loading Image. In this case the best solution is to load the image in background, and then show it to the use. For that you can use the Image-Class provided by the browsers.

This class is the used Class at img-Tags. So you have all known properties, like “src”. With the onload-Event you can then check, if the image was fully loaded or not. An example would be:

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var image = new Image();
$(image).load(function () { alert("picture is fully loaded."); });
image.src="http://www.javahelp.info/wp-content/uploads/2009/11/Bild-80-300x64.png";

In the example I use JQuery for event-handling, because this is more comfortable as the normal event-method of JavaScript.

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