[jboss-user] [EJB 3.0] - two beans within single transaction problem

[beep_beep]

Hi!
I have very strange exception. I'm quite new in ejbs, so , please, be patient.
My bean (SfSB) called by servlet and invoked method on bean has attribute
TransactionAttributeType.REQUIRED.
Then my bean calls other SfSB bean(injected) and called method is also has
TransactionAttributeType.REQUIRED
On second call I have this annoying exception:

What is wrong here? I have no clue.
Please, help!!

anonymous wrote : javax.ejb.EJBException: java.lang.RuntimeException: cannot import a transaction
  | context when a transaction is already associated with the thread
  |         at org.jboss.ejb3.tx.Ejb3TxPolicy.handleExceptionInOurTx(Ejb3TxPolicy.ja
  | va: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(TxPropagationInt
  | erceptor.java:76)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulIn
  | stanceInterceptor.java:81)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.aspects.security.AuthenticationInterceptor.invoke(Authentic
  | ationInterceptor.java:78)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterce
  | ptor.java:47)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(Asynchrono
  | usInterceptor.java:106)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulConta
  | iner.java:308)
  |         at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:104)
  |         at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRem
  | otingInvocationHandler.java:82)
  |         at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:828)
  |         at org.jboss.remoting.transport.local.LocalClientInvoker.invoke(LocalCli
  | entInvoker.java:72)
  |         at org.jboss.remoting.Client.invoke(Client.java:525)
  |         at org.jboss.remoting.Client.invoke(Client.java:488)
  |         at org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemot
  | eInterceptor.java:55)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPr
  | opagationInterceptor.java:61)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityC
  | lientInterceptor.java:55)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.
  | java:65)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.stateful.StatefulRemoteProxy.invoke(StatefulRemoteProx
  | y.java:133)
  |         at $Proxy87.create(Unknown Source)
  |         at com.sap.xtp.client.simple.ClientServlet.doPost(ClientServlet.java:74)
  | 
  |         at com.sap.xtp.client.simple.ClientServlet.doGet(ClientServlet.java:40)
  |         at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
  |         at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
  | icationFilterChain.java:252)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
  | ilterChain.java:173)
  |         at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFi
  | lter.java:81)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
  | icationFilterChain.java:202)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
  | ilterChain.java:173)
  |         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
  | alve.java:213)
  |         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
  | alve.java:178)
  |         at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrinc
  | ipalValve.java:39)
  |         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(Securit
  | yAssociationValve.java:159)
  |         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValv
  | e.java:59)
  |         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
  | ava:126)
  |         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
  | ava:105)
  |         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
  | ve.java:107)
  |         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.jav
  | a:148)
  |         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
  | :856)
  |         at org.apache.coyote.http11.Http11Protocol$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)
  | Caused by: java.lang.RuntimeException: cannot import a transaction context when
  | a transaction is already associated with the thread
  |         at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInt
  | erceptor.java:62)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulIn
  | stanceInterceptor.java:81)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.aspects.security.AuthenticationInterceptor.invoke(Authentic
  | ationInterceptor.java:78)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterce
  | ptor.java:47)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(Asynchrono
  | usInterceptor.java:106)
  |         at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.
  | java:98)
  |         at org.jboss.ejb3.stateful.StatefulContainer.dynamicInvoke(StatefulConta
  | iner.java:308)
  |         at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:104)
  |         at org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRem
  | otingInvocationHandler.java:82)
  | 

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