Jboss+Myeclipse初学者常见问题

使用MyEclipse+JBOSS开发EJB问题:

1.要在Eclipse中JRE类库中加入%JBOSS_HOME%/client/jbossall-client.jar 不然会抛出异常：

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1. Exception in thread "main" javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
2. at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:657)
3. at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
4. at javax.naming.InitialContext.init(InitialContext.java:223)
5. at javax.naming.InitialContext.(InitialContext.java:175)
6. at org.wind.unit.TestCalculator.main(TestCalculator.java:18)
7. Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory
8. at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
9. at java.security.AccessController.doPrivileged(Native Method)
10. at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
11. at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
12. at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
13. at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
14. at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
15. at java.lang.Class.forName0(Native Method)
16. at java.lang.Class.forName(Class.java:247)
17. at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:46)
18. at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:654)
19. ... 4 more

2.在MyEclipse建立EJB客户端项目时,须要手动建立jndi.properties也能够在将%JBOSS_HOME%\server\all\conf\jndi.properties复制到项目中，也能够在CODE中使用Properties类或者Hashtable类建立一个jndi，不然找不到JNDI而抛出异常：

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1. Exception in thread "main" javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file:  java.naming.factory.initial
2. at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:645)
3. at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
4. at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:325)
5. at javax.naming.InitialContext.lookup(InitialContext.java:392)
6. at org.wind.unit.TestCalculator.main(TestCalculator.java:30)

3.将jndi.properties复制到项目中以后，要在jndi.properties中加入java.naming.provider.url=localhost:1099 （不必定是localhost:1099根据开发须要可能会更改）不然会抛出异常：

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1. Exception in thread "main" javax.naming.CommunicationException: Receive timed out [Root exception is java.net.SocketTimeoutException: Receive timed out]
2. at org.jnp.interfaces.NamingContext.discoverServer(NamingContext.java:1465)
3. at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:1594)
4. at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:634)
5. at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:627)
6. at javax.naming.InitialContext.lookup(InitialContext.java:392)
7. at org.wind.unit.TestCalculator.main(TestCalculator.java:30)
8. Caused by: java.net.SocketTimeoutException: Receive timed out
9. at java.net.PlainDatagramSocketImpl.receive0(Native Method)
10. at java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
11. at java.net.DatagramSocket.receive(DatagramSocket.java:712)
12. at org.jnp.interfaces.NamingContext.discoverServer(NamingContext.java:1435)
13. ... 5 more

使用Propertie类：

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1. Properties props = new Properties();
2. props.setProperty("java.naming.factory.initial",     "org.jnp.interfaces.NamingContextFactory");
3. props.setProperty("java.naming.provider.url", "localhost:1099");
4. InitialContext ict=new InitialContext(props);

使用Hashtable：

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1. Hashtable prop=new Hashtable();
2. prop.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
3. prop.put(Context.PROVIDER_URL, "localhost:1099");
4. InitialContext ict=new InitialContext(prop);

4.JNDI命名规则是 EAR包名/Bean名称/remote(local) 若没有EAR包则直接是Bean名称/remote(local)。

5.当使用local时 要注意测试的时候必定要保证都在一个JVM中。

6.建立Session Bean时要注意本身使用的是有状态(@Stateful)仍是无状态(@Stateless)

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