I have an EAR file set up as follows:
- jar with entity and session beans, annotated with Seam/EJB3. Also has
WsServlet class, which is a regular "Hello World" servlet, but looks up an SLSB.
- war file that uses Seam/JSF
- another war file that just has a web.xml that defines WsServlet
When I make a request to WsServlet, I get the following stacktrace:
| 16:58:38,180 ERROR [[WsServlet]] Servlet.service() for servlet WsServlet
threw exception
| javax.ejb.EJBException: java.lang.NullPointerException
| at
org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.java:69)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:83)
| at
org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:192)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:54)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.ejb3.stateless.StatelessContainer.localInvoke(StatelessContainer.java:178)
| at
org.jboss.ejb3.stateless.StatelessLocalProxy.invoke(StatelessLocalProxy.java:74)
| at $Proxy187.find(Unknown Source)
| at com.inertiabev.ws.WsServlet.doPost(WsServlet.java:45)
| at com.inertiabev.ws.WsServlet.doGet(WsServlet.java:32)
| at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
| at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
| at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
| at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
| at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
| at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
| at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
| at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
| at
org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:54)
| at
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:174)
| at
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
| at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
| at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
| at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
| at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
| at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:868)
| at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:663)
| at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
| at
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
| at java.lang.Thread.run(Thread.java:595)
| Caused by: java.lang.NullPointerException
| at org.jboss.seam.Component.forName(Component.java:1011)
| at
org.jboss.seam.ejb.SeamInterceptor.getSeamComponent(SeamInterceptor.java:61)
| at
org.jboss.seam.ejb.SeamInterceptor.aroundInvoke(SeamInterceptor.java:34)
| at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
| at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
| at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
| at java.lang.reflect.Method.invoke(Method.java:585)
| at
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:120)
| at
org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:62)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
| at
org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
| at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
| ... 38 more
|
The servlet code is as follows:
| public void doPost (HttpServletRequest request, HttpServletResponse
response)
| throws ServletException,
| IOException
| {
| try {
| PrintWriter out = response.getWriter () ;
| out.println ("Hello World!") ;
|
| InitialContext ctx = new InitialContext () ;
| BaseDao baseDao = (BaseDao) ctx.lookup ("biggie/BaseDaoBean/local") ;
| State state = baseDao.find (State.class, "NY") ;
| out.println (state.toString()) ;
|
| out.close () ;
| return;
| }
| catch (NamingException e) {
| e.printStackTrace();
| throw new ServletException (e) ;
| }
| }
|
BaseDao is an SLSB that is also a Seam component (uses the @Interceptors
annotation). State is an @Entity bean.
I'm somewhat new to EJBs, so I might be doing something wrong with the EJB3
context lookup. However, the SeamInterceptor comes up in the stack trace, so I
just wanted to make sure that there wasn't anything in Seam that would prevent
me from looking up a Seam component as a regular EJB.
I suppose the fallback is to lookup the BaseDaoBean from the Seam context?
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