Been doing some investigation myself and seems that @Transactional might
in fact work with the OpenEntityManagerInView filter.
@Doychi: Which transaction manager have you defined in your spring.xml?
Bob Schellink wrote:
Bob, you are right about the EnityManger being closed. I spent quite
a bit
of time looking into the error and the Spring forums say that the
listener
(org.springframework.web.context.ContextLoaderListener) should work in
the
same way. Either way, I get the same error whether I use the listener or
the open view filter.
The ContextLoaderListener is Spring's bootstrap mechanism in web
applications. In other words when the web application starts up,
ContextLoaderListener will read your spring.xml file and create the
Spring ApplicationContext. It won't open or close the EntityManager or
commit transactions. So I'm fairly confident that ContextLoaderListener
is not where the issue lies.
I still think the problem lies in the fact that you have the
@Transactional annotation on your Repository. Btw I'm not saying that
having @Transaction on the Repository is wrong, its just that it means
the Transaction will commit whenever a method on Repository is invoked,
and the session will get closed. If you want to use @Transactional on
your Repository you basically need to know which entities to load eagerly.
I suggest you try the following and see what happens: declare the
OpenEntityManagerInViewFilter in your web.xml. This filter binds an
EntityManager instance to the thread for the duration of the request.
However even if you have the filter, the @Transactional annotation will
still commit the transaction (and close the session) after any
Repository method is invoked. So try and remove the @Transactional
annotation from the Repository and see what happens. Do you still get
the lazy exception? Very likely something else will break but at least
this should prove the theory of @Transactional :)
Let us know your findings.
kind regards
bob
BTW thanks for any assistance.
[Click] [error] handleException:
org.hibernate.LazyInitializationException:
failed to lazily initialize a collection of role:
au.org.pheno.f1.domain.attendees.jpa.PrincipalJpa.registeredForEvents, no
session or session was closed
at
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
at
org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
at
org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
at
org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
at
org.hibernate.collection.PersistentBag.toString(PersistentBag.java:483)
at java.lang.String.valueOf(String.java:2838)
at java.lang.StringBuffer.append(StringBuffer.java:236)
at
org.apache.commons.lang.builder.ToStringStyle.appendDetail(ToStringStyle.java:590)
at
org.apache.commons.lang.builder.ToStringStyle.appendInternal(ToStringStyle.java:465)
at
org.apache.commons.lang.builder.ToStringStyle.append(ToStringStyle.java:428)
at
org.apache.commons.lang.builder.ToStringBuilder.append(ToStringBuilder.java:840)
at
org.apache.commons.lang.builder.ReflectionToStringBuilder.appendFieldsIn(ReflectionToStringBuilder.java:606)
at
org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(ReflectionToStringBuilder.java:759)
at
org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(ReflectionToStringBuilder.java:287)
at
org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(ReflectionToStringBuilder.java:121)
at
org.apache.commons.lang.builder.ToStringBuilder.reflectionToString(ToStringBuilder.java:126)
at
au.org.pheno.f1.domain.attendees.jpa.PrincipalJpa.toString(PrincipalJpa.java:655)
at au.org.pheno.f1.test.pages.LoginPage.onInit(LoginPage.java:66)
at org.apache.click.ClickServlet.processPage(ClickServlet.java:512)
at org.apache.click.ClickServlet.handleRequest(ClickServlet.java:334)
at org.apache.click.ClickServlet.doGet(ClickServlet.java:253)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:636)
