6 Replies Latest reply on Jan 18, 2012 10:48 PM by jaikiran

Remote EJB

jbossadmin_007 Jan 11, 2012 10:47 PM

Hello,

I am currently attempting to learn EJBs (with JBoss 5.1), however I am having some trouble with classpath (I guess). I have a simple EJB client and server jar (From the EJB 3 in Action book code samples [1]). I deploy the server jar to JBoss and call it from the client outside JBoss (remote) via the following command:

java -jar myEjbClient.jar -classpath /home/jdoe/Desktop/jboss-5.1.0.GA/lib/*.jar /home/jdoe/Desktop/jboss-5.1.0.GA/common/lib/*.jar /home/jdoe/Desktop/jboss-5.1.0.GA/server/default/deployers/ejb3.deployer/*.jar /home/jdoe/Desktop/jboss-5.1.0.GA/server/default/deployers/jboss-aop-jboss5.deployer/*.jar /home/jdoe/Desktop/jboss-5.1.0.GA/client/*.jar

As you can see, I place pretty much everthing on the classpath, but I keep running into:

javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]

at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:674)

at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:305)

at javax.naming.InitialContext.init(InitialContext.java:240)

at javax.naming.InitialContext.<init>(InitialContext.java:214)

at com.ejb3inaction.actionbazaar.client.HelloUserClient.main(HelloUserClient.java:20)

Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory

at java.net.URLClassLoader$1.run(URLClassLoader.java:217)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:205)

at java.lang.ClassLoader.loadClass(ClassLoader.java:321)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)

at java.lang.ClassLoader.loadClass(ClassLoader.java:266)

at java.lang.Class.forName0(Native Method)

at java.lang.Class.forName(Class.java:264)

at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:63)

at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:671)

... 4 more

How am I getting "java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory" when jnpserver.jar (which contains this class) is on the classpath (common/lib directory)

*FYI, I didnt use jndi.properties (in client jar), I used the following instead:

Hashtable<String,String> env = new Hashtable<String,String>();

env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");

env.put(Context.URL_PKG_PREFIXES,"jboss.naming:org.jnp.interfaces");

env.put(Context.PROVIDER_URL, "localhost:1099");

InitialContext context = new InitialContext(env);

*FYI, I have also specified an entry point in MANIFEST.MF in the client jar.

I attached both server and client jar; they also contain the source (from the book).

Thanks for your help

-jbossadmin_007

[1]http://www.manning.com/panda/

EJBQuestion.zip 3.6 KB

1. Re: Remote EJB

jaikiran Jan 11, 2012 11:35 PM (in response to jbossadmin_007)

The *.jar syntax won't work. All you need is to add the JBOSS_HOME/client/jbossall-client.jar to the client classpath.
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2. Re: Remote EJB

jbossadmin_007 Jan 12, 2012 9:19 PM (in response to jaikiran)

Hello jaikiran,

I tried the following:

java -jar myEjbClient.jar -cp /home/jdoe/Desktop/JBoss/jboss-5.1.0.GA/client/jbossall-client.jar

and

java -jar myEjbClient.jar -classpath /home/jdoe/Desktop/JBoss/jboss-5.1.0.GA/client/jbossall-client.jar

Im still getting

javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory]
          at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:674)
          at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:305)
          at javax.naming.InitialContext.init(InitialContext.java:240)
          at javax.naming.InitialContext.<init>(InitialContext.java:214)
          at com.ejb3inaction.actionbazaar.client.HelloUserClient.main(HelloUserClient.java:20)
Caused by: java.lang.ClassNotFoundException: org.jnp.interfaces.NamingContextFactory
          at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
          at java.security.AccessController.doPrivileged(Native Method)
          at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
          at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
          at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
          at java.lang.Class.forName0(Native Method)
          at java.lang.Class.forName(Class.java:264)
          at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:63)
          at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:671)
          ... 4 more
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3. Re: Remote EJB

jaikiran Jan 12, 2012 9:38 PM (in response to jbossadmin_007)

java -jar myEjbClient.jar ...
The moment you use java -jar, it won't use the classpath specified via the -cp parameter. It will look for the Class-Path attribute in the myEjbClient.jar/META-INF/MANIFEST.MF to setup the classpath. Sorry hadn't paid attention that from your first post. You can try running it as:

java -cp <classpath containing your client class and JBoss jars> <your client classname>
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4. Re: Remote EJB

jbossadmin_007 Jan 13, 2012 11:36 PM (in response to jaikiran)

Hello,

Thanks so much for your help. I feel as if I'm making some progress; however, now I have a different exception:

From the command line, I run the following:
java -cp /home/jdoe/Desktop/JBoss/jboss-5.1.0.GA/client/jbossall-client.jar:myEjbClient.jar com.ejb3inaction.actionbazaar.client.HelloUserClient

I now recieve a different output:

log4j:WARN No appenders could be found for logger (org.jnp.interfaces.TimedSocketFactory).
log4j:WARN Please initialize the log4j system properly.
javax.naming.NamingException: Could not dereference object [Root exception is java.lang.reflect.UndeclaredThrowableException]
          at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1504)
          at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:822)
          at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686)
          at javax.naming.InitialContext.lookup(InitialContext.java:409)
          at com.ejb3inaction.actionbazaar.client.HelloUserClient.main(HelloUserClient.java:21)
Caused by: java.lang.reflect.UndeclaredThrowableException
          at $Proxy0.createProxyBusiness(Unknown Source)
          at org.jboss.ejb3.proxy.impl.objectfactory.session.SessionProxyObjectFactory.createProxy(SessionProxyObjectFactory.java:129)
          at org.jboss.ejb3.proxy.impl.objectfactory.session.stateless.StatelessSessionProxyObjectFactory.getProxy(StatelessSessionProxyObjectFactory.java:79)
          at org.jboss.ejb3.proxy.impl.objectfactory.ProxyObjectFactory.getObjectInstance(ProxyObjectFactory.java:158)
          at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
          at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1479)
          at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1496)
          ... 4 more
Caused by: java.lang.ClassNotFoundException: com.ejb3inaction.actionbazaar.buslogic.HelloUser
          at org.jboss.remoting.serialization.ClassLoaderUtility.loadClass(ClassLoaderUtility.java:103)
          at org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClassLoader.java:86)
          at java.lang.Class.forName0(Native Method)
          at java.lang.Class.forName(Class.java:264)
          at org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveProxyClass(ObjectInputStreamWithClassLoader.java:253)
          at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1548)
          at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1510)
          at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
          at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
          at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
          at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:119)
          at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1809)
          at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1768)
          at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
          at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1963)
          at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1887)
          at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1770)
          at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
          at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
          at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObjectVersion2_2(JavaSerializationManager.java:238)
          at org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:138)
          at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:123)
          at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.versionedRead(MicroSocketClientInvoker.java:1220)
          at org.jboss.remoting.transport.socket.MicroSocketClientInvoker.transport(MicroSocketClientInvoker.java:850)
          at org.jboss.remoting.MicroRemoteClientInvoker.invoke(MicroRemoteClientInvoker.java:165)
          at org.jboss.remoting.Client.invoke(Client.java:1724)
          at org.jboss.remoting.Client.invoke(Client.java:629)
          at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:60)
          at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
          at org.jboss.ejb3.proxy.impl.remoting.IsLocalProxyFactoryInterceptor.invoke(IsLocalProxyFactoryInterceptor.java:72)
          at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
          at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
          at $Proxy0.createProxyBusiness(Unknown Source)
          at org.jboss.ejb3.proxy.impl.objectfactory.session.SessionProxyObjectFactory.createProxy(SessionProxyObjectFactory.java:129)
          at org.jboss.ejb3.proxy.impl.objectfactory.session.stateless.StatelessSessionProxyObjectFactory.getProxy(StatelessSessionProxyObjectFactory.java:79)
          at org.jboss.ejb3.proxy.impl.objectfactory.ProxyObjectFactory.getObjectInstance(ProxyObjectFactory.java:158)
          at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)
          at org.jnp.interfaces.NamingContext.getObjectInstance(NamingContext.java:1479)
          at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingContext.java:1496)
          at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:822)
          at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:686)
          at javax.naming.InitialContext.lookup(InitialContext.java:409)
          at com.ejb3inaction.actionbazaar.client.HelloUserClient.main(HelloUserClient.java:21)
          at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:72)
          at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
          at org.jboss.ejb3.proxy.impl.remoting.IsLocalProxyFactoryInterceptor.invoke(IsLocalProxyFactoryInterceptor.java:72)
          at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
          at org.jboss.aspects.remoting.PojiProxy.invoke(PojiProxy.java:62)
          ... 11 more
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5. Re: Remote EJB

jbossadmin_007 Jan 18, 2012 10:37 PM (in response to jbossadmin_007)

I finally figured it out. With the standalone remote EJB client, you have to also include the my server ejb jars on the classpath as well.
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6. Re: Remote EJB

jaikiran Jan 18, 2012 10:48 PM (in response to jbossadmin_007)

Sorry did not notice the earlier reply.

Johnathan B. wrote:

I finally figured it out. With the standalone remote EJB client, you have to also include the my server ejb jars on the classpath as well.
You'll only need the EJB's interfaces (business interfaces, home interfaces if any) and ofcourse whatever class types are being passed and returned from and to the bean. You do not need the EJB implementation class on the client classpath.
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