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Sandro Germani · Guest

I have the following problems with JBuilder 2006 (and also 2005) and
JBoss 4.0.2.

I developed a simple enterprise application including a stateless
session bean and
a servlet. The stateless session bean has only 1 method (hello) that
accept a String parameter
(the name) and return the String "Hello " + name.

The servlet accept a parameter (the name) with am HTML form and call the
stateless session bean
hello method and display the result on a new html page.

These are the steps I followed (I used mainly the JBuilder wizards
without changing the names
proposed in the wizard).

I created the Hello Project setting the Jdk 1.4 and setting as
Enterprise Server JBoss 4.0.2 (JBuilder
2006 support this release).
I created an ejb module, then I created a stateless session bean with a
single method (hello method).
At this point, to test the stateless session bean, I created the test
application (with the wizard) and I deployed
the ejb in the server. I run the test client application and all worked
fine. At this point I undeployed
the ejb module.

In the same project I created a web application, then a standard servlet
with the doPost method and an html
form with one parameter. In the doPost method I created the reference to
the ejb with the following
statements:

try {
Context context = new InitialContext();
Object ref = context.lookup("java:comp/env/ejb/hello");
enterprise1Home =
(Enterprise1Home)PortableRemoteObject.narrow(ref,
Enterprise1Home.class);
enterprise1 = enterprise1Home.create();
} catch (Exception ex) {
ex.printStackTrace();
}

So in the web.xml file I created the reference to the ejb. All these
steps are veri simple in JBuilder and I did that
a lot of time.

At this point I created with the wizard a EAR application. Also in this
case all is very simple.

I deployed the EAR application in the JBoss AS, I opened my browser and
I connected to html page, I inserted
a name in the form and I cliked the Submit button. At this point I have
the following error message displayed
in the JBoss window.

I didn't understand this error because I have developed in the past a
lot of similar applications using minor
release of JBoss and all worked fine. In fact I deployed the same EAR
without recompilation in the JBoss 4.0.1SP1
Server, I repeated the same operations and now all has worked fine
without problems.

Please, I am trying to solve this problems since several days without
success. Is there someone who wants to try?
I can also send the complete project.

Thank you very much and bye,
Sandro

Here is the JBoss error message:

11:35:57,515 INFO [STDOUT] java.lang.ClassCastException
11:35:57,515 INFO [STDOUT] at
com.sun.corba.se.impl.javax.rmi.PortableRemot
eObject.narrow(PortableRemoteObject.java:229)
11:35:57,515 INFO [STDOUT] at
javax.rmi.PortableRemoteObject.narrow(Portabl
eRemoteObject.java:137)
11:35:57,515 INFO [STDOUT] at
helloproject.HelloServlet.doGet(HelloServlet.
java:32)
11:35:57,515 INFO [STDOUT] at
helloproject.HelloServlet.doPost(HelloServlet
..java:57)
11:35:57,515 INFO [STDOUT] at
javax.servlet.http.HttpServlet.service(HttpSe
rvlet.java:717)
11:35:57,515 INFO [STDOUT] at
javax.servlet.http.HttpServlet.service(HttpSe
rvlet.java:810)
11:35:57,515 INFO [STDOUT] at
org.apache.catalina.core.ApplicationFilterCha
in.internalDoFilter(ApplicationFilterChain.java:252)
11:35:57,515 INFO [STDOUT] at
org.apache.catalina.core.ApplicationFilterCha
in.doFilter(ApplicationFilterChain.java:173)
11:35:57,515 INFO [STDOUT] at
org.jboss.web.tomcat.filters.ReplyHeaderFilte
r.doFilter(ReplyHeaderFilter.java:81)
11:35:57,515 INFO [STDOUT] at
org.apache.catalina.core.ApplicationFilterCha
in.internalDoFilter(ApplicationFilterChain.java:202)
11:35:57,515 INFO [STDOUT] at
org.apache.catalina.core.ApplicationFilterCha
in.doFilter(ApplicationFilterChain.java:173)
11:35:57,531 INFO [STDOUT] at
org.apache.catalina.core.StandardWrapperValve
..invoke(StandardWrapperValve.java:213)
11:35:57,531 INFO [STDOUT] at
org.apache.catalina.core.StandardContextValve
..invoke(StandardContextValve.java:178)
11:35:57,531 INFO [STDOUT] at
org.jboss.web.tomcat.security.CustomPrincipal
Valve.invoke(CustomPrincipalValve.java:39)
11:35:57,531 INFO [STDOUT] at
org.jboss.web.tomcat.security.SecurityAssocia
tionValve.invoke(SecurityAssociationValve.java:153)
11:35:57,531 INFO [STDOUT] at
org.jboss.web.tomcat.security.JaccContextValv
e.invoke(JaccContextValve.java:59)
11:35:57,531 INFO [STDOUT] at
org.apache.catalina.core.StandardHostValve.in
voke(StandardHostValve.java:126)
11:35:57,531 INFO [STDOUT] at
org.apache.catalina.valves.ErrorReportValve.i
nvoke(ErrorReportValve.java:105)
11:35:57,531 INFO [STDOUT] at
org.apache.catalina.core.StandardEngineValve.
invoke(StandardEngineValve.java:107)
11:35:57,531 INFO [STDOUT] at
org.apache.catalina.connector.CoyoteAdapter.s
ervice(CoyoteAdapter.java:148)
11:35:57,531 INFO [STDOUT] at
org.apache.coyote.http11.Http11Processor.proc
ess(Http11Processor.java:856)
11:35:57,531 INFO [STDOUT] at
org.apache.coyote.http11.Http11Protocol$Http1
1ConnectionHandler.processConnection(Http11Protocol.java:744)
11:35:57,531 INFO [STDOUT] at
org.apache.tomcat.util.net.PoolTcpEndpoint.pr
ocessSocket(PoolTcpEndpoint.java:527)
11:35:57,531 INFO [STDOUT] at
org.apache.tomcat.util.net.MasterSlaveWorkerT
hread.run(MasterSlaveWorkerThread.java:112)
11:35:57,531 INFO [STDOUT] at java.lang.Thread.run(Thread.java:595)

11:35:57,531 INFO [STDOUT] Caused by: java.lang.ClassCastException:
$Proxy55
11:35:57,531 INFO [STDOUT] at
com.sun.corba.se.impl.javax.rmi.PortableRemot
eObject.narrow(PortableRemoteObject.java:212)
11:35:57,531 INFO [STDOUT] ... 24 more
11:35:57,531 ERROR [[helloservlet]] Servlet.service() for servlet
helloservlet t
hrew exception
java.lang.NullPointerException
at helloproject.HelloServlet.doGet(HelloServlet.java:3 Cool

at helloproject.HelloServlet.doPost(HelloServlet.java:57)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
lter.java:81)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:202)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:178)
at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrinc
ipalValve.java:39)
at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
yAssociationValve.java:153)
at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
e.java:59)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:126)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
a:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:856)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:744)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpo
int.java:527)
at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWor
kerThread.java:112)
at java.lang.Thread.run(Thread.java:595)