Transaction integration (concurrency?) failure: Spring + Seam

[luxspes]

Hi!
I am working with Seam 2.1.1.GA I have a page with a link to edit a Pojo (very similar to the edit link in a base seam-gen application), if the user clicks this edit link many times (like users typically do when the network is slow) I get the following exception:

org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is java.lang.NullPointerException

I am integrating Seam and Spring EntityManager as described in this article (and in Dan Allen book).

On a fast network only happens if the edit link is clicked fast many times (in a slow network 2 o 3 clicks will do the trick). I guess the root cause is somekind of concurrency issue between Seam and Spring...

Any hints?

Here is the full Stack trace:

2009-04-15 12:29:33,757 ERROR org.jboss.seam.exception.Exceptions - handled and logged exception
java.lang.IllegalStateException: Could not start transaction
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:599) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:584) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.jsf.SeamPhaseListener.handleTransactionsBeforePhase(SeamPhaseListener.java:325) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:142) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:116) [[e-mail]:2.1.1.GA]
     at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:214) [[e-mail]:1.2_09-b01-BETA1]
     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:96) [[e-mail]:1.2_09-b01-BETA1]
     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) [[e-mail]:1.2_09-b01-BETA1]
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266) [[e-mail]:1.2_09-b01-BETA1]
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) [catalina.jar:na]
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:na]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [[e-mail]:2.1.1.GA]
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:177) [[e-mail]:3.2.2.GA]
     at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:267) [[e-mail]:3.2.2.GA]
     at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:380) [[e-mail]:3.2.2.GA]
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:507) [[e-mail]:3.2.2.GA]
     at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) [[e-mail]:2.1.1.GA]
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) [catalina.jar:na]
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) [catalina.jar:na]
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) [catalina.jar:na]
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) [catalina.jar:na]
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) [catalina.jar:na]
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) [catalina.jar:na]
     at org.jstripe.tomcat.probe.Tomcat55AgentValve.invoke(Tomcat55AgentValve.java:20) [Tomcat55AgentValve.class:na]
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [catalina.jar:na]
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [catalina.jar:na]
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) [catalina.jar:na]
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) [tomcat-coyote.jar:na]
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) [tomcat-coyote.jar:na]
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) [tomcat-coyote.jar:na]
     at java.lang.Thread.run(Thread.java:619) [na:1.6.0_06]
Caused by: org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is java.lang.NullPointerException
     at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:379) [[e-mail]:2.5.1]
     at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:377) [[e-mail]:2.5.1]
     at org.jboss.seam.ioc.spring.SpringTransaction.begin(SpringTransaction.java:67) [[e-mail]:2.1.1.GA]
     at org.jboss.seam.jsf.SeamPhaseListener.begin(SeamPhaseListener.java:594) [[e-mail]:2.1.1.GA]
     ... 42 common frames omitted
Caused by: java.lang.NullPointerException
     at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) [[e-mail]:3.2.4.sp1]
     at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326) [[e-mail]:3.2.4.sp1]
     at org.hibernate.ejb.TransactionImpl.begin(TransactionImpl.java:38) [[e-mail]:na]
     at org.springframework.orm.jpa.DefaultJpaDialect.beginTransaction(DefaultJpaDialect.java:70) [[e-mail]:2.5.1]
     at org.springframework.orm.jpa.JpaTransactionManager.doBegin(JpaTransactionManager.java:330) [[e-mail]:2.5.1]
     ... 45 common frames omitted

[luxspes]

Looks like hibernate could be the problem:

Caused by: java.lang.NullPointerException
     at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) [[e-mail]:3.2.4.sp1]
     at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326) [[e-mail]:3.2.4.sp1]

Something is null in inside org.hibernate.transaction.JDBCTransaction.begin, has anyone else had this problem?

[luxspes]

I no longer think this is an Hibernate problem, I now think that either JBSEAM-3151 or the fix caused a new closely related bug.

[youngm]

What Hibernate ConnectionManager are you using?  That appears to be the key.  for some reason Hibernate is getting a null connection from the current ConnectionManager.

Mike

[luxspes]

I did not alter any configuration related to the ConnectionManager. I was not even aware that it was possible to alter its configuration... Can you point me to page that discusses configuration options for the ConnectionManager (AFAIK it looks like there is only one implementation, but you post seems to imply that there are others?)?

[youngm]

Sorry I meant to say ConnectionProvider.  It probably wouldn't be something that a configuration change would help.  I would recommend debugging through JDBCTransaction.begin() and see what it is doing when it gets to the ConnectionProvider see if you can determine why the ConnectionProvider is not returning a connection under load.

Mike