3 Replies Latest reply on Aug 3, 2006 9:30 AM by bfo81

How to catch exception when deleting?

bfo81 Aug 2, 2006 12:41 PM

I have a Stateful Session Bean with a method delete(). Guess what is does? It deletes an entity ;).

@Stateful
@Scope(Scopetype.SESSION)
@name("foo")
...

 @In(create=true)
 private EntityManager em;

 public String delete() {

 em.remove(anEntity);

 return "finished";

 }

Ok, now it could be that the user wants to delete an entity that is referenced by other entities. So an SqlException is thrown telling that a database constraint is violated. I wanted to catch that exception and tell the user that deletion wasn't successful. I tried it like this:

 public String delete() {

 try {
 em.remove(anEntitiy);
 } catch (Exception ex) {
 ...addMessage("Deletion failed!");
 }
 return "finished";
 }

Unfortunately that doesn't work, the exception isn't caught and Facelets displays an ugly error message.

Well... why? *g*

Here's the log. It's long but please don't be shocked ;).

2006-08-02 18:25:38,359 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
2006-08-02 18:25:38,359 DEBUG [org.hibernate.SQL] delete from Person where id=? and version=?
2006-08-02 18:25:38,359 INFO [STDOUT] Hibernate: delete from Person where id=? and version=?
2006-08-02 18:25:38,375 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
2006-08-02 18:25:38,375 DEBUG [org.hibernate.jdbc.ConnectionManager] skipping aggressive-release due to flush cycle
2006-08-02 18:25:38,375 DEBUG [org.hibernate.util.JDBCExceptionReporter] could not delete: [de.beffo.test.model.Person#9] [delete from Person where id=? and version=?]
java.sql.SQLException: Cannot delete or update a parent row: a foreign key constraint fails (`test/person_person`, CONSTRAINT `FKB9039F7F77F35DCE` FOREIGN KEY (`freunde_id`) REFERENCES `person` (`id`))
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
 at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1124)
 at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:676)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1166)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1082)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1067)
 at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:251)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2366)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2516)
 at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:73)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:144)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:993)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:340)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:475)
 at org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1491)
 at org.jboss.tm.TransactionImpl.beforePrepare(TransactionImpl.java:1110)
 at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:324)
 at org.jboss.tm.TxManager.commit(TxManager.java:240)
 at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:175)
 at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
 at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:81)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateful.StatefulContainer.localInvoke(StatefulContainer.java:188)
 at org.jboss.ejb3.stateful.StatefulLocalProxy.invoke(StatefulLocalProxy.java:98)
 at $Proxy112.loeschen(Unknown Source)
 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 com.sun.el.parser.AstValue.invoke(AstValue.java:151)
 at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
 at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
 at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69)
 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
 at javax.faces.component.UICommand.broadcast(UICommand.java:106)
 at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
 at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:132)
 at org.apache.myfaces.lifecycle.LifecycleImpl.applyRequestValues(LifecycleImpl.java:200)
 at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:71)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:30)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 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.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 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:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
 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)
2006-08-02 18:25:38,375 WARN [org.hibernate.util.JDBCExceptionReporter] SQL Error: 1451, SQLState: 23000
2006-08-02 18:25:38,375 ERROR [org.hibernate.util.JDBCExceptionReporter] Cannot delete or update a parent row: a foreign key constraint fails (`test/person_person`, CONSTRAINT `FKB9039F7F77F35DCE` FOREIGN KEY (`freunde_id`) REFERENCES `person` (`id`))
2006-08-02 18:25:38,375 ERROR [org.hibernate.event.def.AbstractFlushingEventListener] Could not synchronize database state with session
org.hibernate.exception.ConstraintViolationException: could not delete: [de.beffo.test.model.Person#9]
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2384)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2516)
 at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:73)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:144)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:993)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:340)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:475)
 at org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1491)
 at org.jboss.tm.TransactionImpl.beforePrepare(TransactionImpl.java:1110)
 at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:324)
 at org.jboss.tm.TxManager.commit(TxManager.java:240)
 at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:175)
 at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
 at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:81)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateful.StatefulContainer.localInvoke(StatefulContainer.java:188)
 at org.jboss.ejb3.stateful.StatefulLocalProxy.invoke(StatefulLocalProxy.java:98)
 at $Proxy112.loeschen(Unknown Source)
 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 com.sun.el.parser.AstValue.invoke(AstValue.java:151)
 at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
 at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
 at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69)
 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
 at javax.faces.component.UICommand.broadcast(UICommand.java:106)
 at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
 at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:132)
 at org.apache.myfaces.lifecycle.LifecycleImpl.applyRequestValues(LifecycleImpl.java:200)
 at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:71)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:30)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 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.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 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:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
 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.sql.SQLException: Cannot delete or update a parent row: a foreign key constraint fails (`test/person_person`, CONSTRAINT `FKB9039F7F77F35DCE` FOREIGN KEY (`freunde_id`) REFERENCES `person` (`id`))
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
 at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1124)
 at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:676)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1166)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1082)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1067)
 at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:251)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2366)
 ... 67 more
2006-08-02 18:25:38,375 DEBUG [org.hibernate.jdbc.ConnectionManager] aggressively releasing JDBC connection
2006-08-02 18:25:38,375 DEBUG [org.hibernate.jdbc.ConnectionManager] releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)]
2006-08-02 18:25:38,421 DEBUG [org.hibernate.jdbc.JDBCContext] TransactionFactory reported no active transaction; Synchronization not registered
2006-08-02 18:25:38,421 DEBUG [org.hibernate.jdbc.JDBCContext] TransactionFactory reported no active transaction; Synchronization not registered
2006-08-02 18:25:38,421 DEBUG [org.hibernate.jdbc.JDBCContext] TransactionFactory reported no active transaction; Synchronization not registered
2006-08-02 18:25:38,421 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.parentTraceEnabled=true
2006-08-02 18:25:38,421 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.nestedTraceEnabled=false
2006-08-02 18:25:38,421 DEBUG [org.jboss.util.NestedThrowable] org.jboss.util.NestedThrowable.detectDuplicateNesting=true
2006-08-02 18:25:38,437 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/test].[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception
javax.faces.FacesException: Error calling action method of component with id _id19:_id42
 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
 at javax.faces.component.UICommand.broadcast(UICommand.java:106)
 at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
 at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:132)
 at org.apache.myfaces.lifecycle.LifecycleImpl.applyRequestValues(LifecycleImpl.java:200)
 at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:71)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:106)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.seam.servlet.SeamRedirectFilter.doFilter(SeamRedirectFilter.java:30)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 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.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
 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:869)
 at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.el.EvaluationException: /personEditor.xhtml @82,124 action="#{personEditor.loeschen}": java.lang.RuntimeException: org.jboss.tm.JBossRollbackException: Unable to commit, tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=SCHLEPPI/34, BranchQual=, localId=34] status=STATUS_NO_TRANSACTION; - nested throwable: (javax.persistence.EntityExistsException: org.hibernate.exception.ConstraintViolationException: could not delete: [de.beffo.test.model.Person#9])
 at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)
 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
 ... 27 more
Caused by: java.lang.RuntimeException: org.jboss.tm.JBossRollbackException: Unable to commit, tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=SCHLEPPI/34, BranchQual=, localId=34] status=STATUS_NO_TRANSACTION; - nested throwable: (javax.persistence.EntityExistsException: org.hibernate.exception.ConstraintViolationException: could not delete: [de.beffo.test.model.Person#9])
 at org.jboss.aspects.tx.TxPolicy.handleEndTransactionException(TxPolicy.java:198)
 at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:180)
 at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:87)
 at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:197)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:76)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateful.StatefulInstanceInterceptor.invoke(StatefulInstanceInterceptor.java:81)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:78)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:47)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.stateful.StatefulContainer.localInvoke(StatefulContainer.java:188)
 at org.jboss.ejb3.stateful.StatefulLocalProxy.invoke(StatefulLocalProxy.java:98)
 at $Proxy112.loeschen(Unknown Source)
 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 com.sun.el.parser.AstValue.invoke(AstValue.java:151)
 at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:283)
 at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
 at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69)
 ... 28 more
Caused by: org.jboss.tm.JBossRollbackException: Unable to commit, tx=TransactionImpl:XidImpl[FormatId=257, GlobalId=SCHLEPPI/34, BranchQual=, localId=34] status=STATUS_NO_TRANSACTION; - nested throwable: (javax.persistence.EntityExistsException: org.hibernate.exception.ConstraintViolationException: could not delete: [de.beffo.test.model.Person#9])
 at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:372)
 at org.jboss.tm.TxManager.commit(TxManager.java:240)
 at org.jboss.aspects.tx.TxPolicy.endTransaction(TxPolicy.java:175)
 ... 52 more
Caused by: javax.persistence.EntityExistsException: org.hibernate.exception.ConstraintViolationException: could not delete: [de.beffo.test.model.Person#9]
 at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:555)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:484)
 at org.jboss.tm.TransactionImpl.doBeforeCompletion(TransactionImpl.java:1491)
 at org.jboss.tm.TransactionImpl.beforePrepare(TransactionImpl.java:1110)
 at org.jboss.tm.TransactionImpl.commit(TransactionImpl.java:324)
 ... 54 more
Caused by: org.hibernate.exception.ConstraintViolationException: could not delete: [de.beffo.test.model.Person#9]
 at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71)
 at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2384)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2516)
 at org.hibernate.action.EntityDeleteAction.execute(EntityDeleteAction.java:73)
 at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
 at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:144)
 at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:297)
 at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
 at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:993)
 at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:340)
 at org.hibernate.ejb.AbstractEntityManagerImpl$1.beforeCompletion(AbstractEntityManagerImpl.java:475)
 ... 57 more
Caused by: java.sql.SQLException: Cannot delete or update a parent row: a foreign key constraint fails (`test/person_person`, CONSTRAINT `FKB9039F7F77F35DCE` FOREIGN KEY (`freunde_id`) REFERENCES `person` (`id`))
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2928)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1571)
 at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1124)
 at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:676)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1166)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1082)
 at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1067)
 at org.jboss.resource.adapter.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:251)
 at org.hibernate.persister.entity.AbstractEntityPersister.delete(AbstractEntityPersister.java:2366)
 ... 67 more

1. Re: How to catch exception when deleting?

bfo81 Aug 2, 2006 12:44 PM (in response to bfo81)
Well, I just had a look over the stacktrace again and something jumped into my eye:

at $Proxy112.loeschen(Unknown Source) or in english: at $Proxy112.delete(Unknown Source)

It seems like the container replaces the delete method by some kind of proxy that doesn't catch exceptions. I don't know exactly what's going on behind the scenes here, maybe someone of you can give me a nice hint.
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2. Re: How to catch exception when deleting?

gavin.king Aug 2, 2006 12:56 PM (in response to bfo81)
You would need to do:

public String delete() { try { em.remove(anEntitiy); em.flush(); } catch (Exception ex) { ctx.setRollbackOnly(); ...addMessage("Deletion failed!"); } return "finished"; }
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3. Re: How to catch exception when deleting?

bfo81 Aug 3, 2006 9:30 AM (in response to bfo81)
Thanks for that hint, Gavin. It works now (*) and I learned something (once more after one of your posts) ;).

Btw, for those who have the same problem and read this: ctx is the EJB Session Context, and you can get it via
@Resource private SessionContext ctx;

Don't mistake that for the Seam sessionContext, which can be retrieved by @In private Context sessionContext ;).

(*) Little anecdote: I logged the exception, and since it contained a # (could not delete: [de.beffo.test.model.Person#9]) the JBoss Seam logger tried to perform a replacement here... and *boom* there was an exception and I was near desperation. But after a second glance I found the reason, deleted that line and finally everything worked fine ;). But I even had to remove that dash from addMessage(...) cause otherwise there's an internal similar exception that causes the message not to be created. *Uff*... J2EE is hard work ;).
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