Hi All,
I'm getting a classCastException when I'm casting a ejb Proxy to a home.
Please help me out, I'm stuck badly. The details are given below:
I am using the following versions of the softwares
JDK : j2sdk1.4.2_04
JBOSS: jboss-4.0.2
Eclipse: 3.0.1
JBossIDE eclipse Plugin: 1.4.1.e30
I was trying with the SimpleCalc Application of Getting started document of
JBoss-IDE.
I have created a .ear file of my application and deployed it to jboss server.
I have an ejb named Calculator
>From the servlet I have found the ejb with the JNDI name.
The code for the same is :
Object ref = context.lookup("ejb/Calculator");
printed the proxy class
System.out.println("Info: Proxy Class is =====> "+ref.getClass());
and the proxy classes name printed in console is : $Proxy50
But when I'm trying to cast the proxy to the Calculator EJB's Home, by:
home = (CalculatorHome) PortableRemoteObject.narrow(ref,CalculatorHome.class);
it is giving the following error:
12:39:36,064 INFO [STDOUT] java.lang.ClassCastException
12:39:36,080 INFO [STDOUT] at
com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:293)
12:39:36,080 INFO [STDOUT] at
javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
12:39:36,080 INFO [STDOUT] at
edu.coned.uah.web.CalculatorServlet.init(CalculatorServlet.java:55)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:750)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:130)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
12:39:36,080 INFO [STDOUT] at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
12:39:36,080 INFO [STDOUT] at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
12:39:36,080 INFO [STDOUT] at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
12:39:36,080 INFO [STDOUT] at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
12:39:36,095 INFO [STDOUT] at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
12:39:36,095 INFO [STDOUT] at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
12:39:36,095 INFO [STDOUT] at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
12:39:36,095 INFO [STDOUT] at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
12:39:36,095 INFO [STDOUT] at java.lang.Thread.run(Thread.java:534)
When I'm going through the JMX MBean JNDI View and Listing it, it shows:
Ejb Module: CalculatorEJB.jar
java:comp namespace of the Calculator bean:
+- env (class: org.jnp.interfaces.NamingContext)
java: Namespace
+- XAConnectionFactory (class: org.jboss.mq.SpyXAConnectionFactory)
+- DefaultDS (class: javax.sql.DataSource)
+- SecurityProxyFactory (class:
org.jboss.security.SubjectSecurityProxyFactory)
+- DefaultJMSProvider (class: org.jboss.jms.jndi.JNDIProviderAdapter)
+- comp (class: javax.naming.Context)
+- JmsXA (class: org.jboss.resource.adapter.jms.JmsConnectionFactoryImpl)
+- ConnectionFactory (class: org.jboss.mq.SpyConnectionFactory)
+- jaas (class: javax.naming.Context)
| +- JmsXARealm (class: org.jboss.security.plugins.SecurityDomainContext)
| +- jbossmq (class: org.jboss.security.plugins.SecurityDomainContext)
| +- HsqlDbRealm (class: org.jboss.security.plugins.SecurityDomainContext)
+- timedCacheFactory (class: javax.naming.Context)
Failed to lookup: timedCacheFactory, errmsg=null
+- TransactionPropagationContextExporter (class:
org.jboss.tm.TransactionPropagationContextFactory)
+- StdJMSPool (class: org.jboss.jms.asf.StdServerSessionPoolFactory)
+- Mail (class: javax.mail.Session)
+- TransactionPropagationContextImporter (class:
org.jboss.tm.TransactionPropagationContextImporter)
+- TransactionManager (class: org.jboss.tm.TxManager)
Global JNDI Namespace
+- XAConnectionFactory (class: org.jboss.mq.SpyXAConnectionFactory)
+- UIL2ConnectionFactory[link -> ConnectionFactory] (class:
javax.naming.LinkRef)
+- UserTransactionSessionFactory (proxy: $Proxy11 implements interface
org.jboss.tm.usertx.interfaces.UserTransactionSessionFactory)
+- HTTPConnectionFactory (class: org.jboss.mq.SpyConnectionFactory)
+- console (class: org.jnp.interfaces.NamingContext)
| +- PluginManager (proxy: $Proxy37 implements interface
org.jboss.console.manager.PluginManagerMBean)
+- UIL2XAConnectionFactory[link -> XAConnectionFactory] (class:
javax.naming.LinkRef)
+- UUIDKeyGeneratorFactory (class:
org.jboss.ejb.plugins.keygenerator.uuid.UUIDKeyGeneratorFactory)
+- HTTPXAConnectionFactory (class: org.jboss.mq.SpyXAConnectionFactory)
+- topic (class: org.jnp.interfaces.NamingContext)
| +- testDurableTopic (class: org.jboss.mq.SpyTopic)
| +- testTopic (class: org.jboss.mq.SpyTopic)
| +- securedTopic (class: org.jboss.mq.SpyTopic)
+- queue (class: org.jnp.interfaces.NamingContext)
| +- A (class: org.jboss.mq.SpyQueue)
| +- testQueue (class: org.jboss.mq.SpyQueue)
| +- ex (class: org.jboss.mq.SpyQueue)
| +- DLQ (class: org.jboss.mq.SpyQueue)
| +- D (class: org.jboss.mq.SpyQueue)
| +- C (class: org.jboss.mq.SpyQueue)
| +- B (class: org.jboss.mq.SpyQueue)
+- ConnectionFactory (class: org.jboss.mq.SpyConnectionFactory)
+- UserTransaction (class: org.jboss.tm.usertx.client.ClientUserTransaction)
+- ejb (class: org.jnp.interfaces.NamingContext)
| +- Calculator (proxy: $Proxy50 implements interface
edu.coned.uah.interfaces.CalculatorHome,interface javax.ejb.Handle)
+- jmx (class: org.jnp.interfaces.NamingContext)
| +- invoker (class: org.jnp.interfaces.NamingContext)
| | +- RMIAdaptor (proxy: $Proxy36 implements interface
org.jboss.jmx.adaptor.rmi.RMIAdaptor,interface
org.jboss.jmx.adaptor.rmi.RMIAdaptorExt)
| +- rmi (class: org.jnp.interfaces.NamingContext)
| | +- RMIAdaptor[link -> jmx/invoker/RMIAdaptor] (class:
javax.naming.LinkRef)
+- HiLoKeyGeneratorFactory (class:
org.jboss.ejb.plugins.keygenerator.hilo.HiLoKeyGeneratorFactory)
+- UILXAConnectionFactory[link -> XAConnectionFactory] (class:
javax.naming.LinkRef)
+- UILConnectionFactory[link -> ConnectionFactory] (class:
javax.naming.LinkRef)
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