[jboss-jira] [JBoss JIRA] Created: (HIBERNATE-46) Javassist lazy proxy factoring not thread-safe

Javassist lazy proxy factoring not thread-safe ---------------------------------------------- Key: HIBERNATE-46 URL: http://jira.jboss.com/jira/browse/HIBERNATE-46 Project: Hibernate Issue Type: Bug Environment: JBoss AS 4.0.4 with EJB 3-RC8 Reporter: Ortwin Glück Assigned To: Steve Ebersole Multiple threads may simultanously (especially on SMP systems) create proxy classes for the first time. The JavassistLazyInitializer is not completely thread safe. So the first thread will successfully create the dynamic class, while a second thread may fail. We saw this happen a few times at JBoss startup when multiple messages from other systems arrived via JMS (quite normal when you take your PROD system down for some minutes, as work keeps queuing up). So multiple MDB threads were running the same transactions (using the same classes) and thus the probability for this error to occur is close to 100%. The situation can easily be solved by proper synchronization inside the JavassistLazyInitializer. Caused by: java.lang.RuntimeException: by java.lang.LinkageError: duplicate clas s definition: test/BusinessOrganization_$$_javass ist_272 at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:173) at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy( JavassistLazyInitializer.java:79) ... 136 more Caused by: javassist.CannotCompileException: by java.lang.LinkageError: duplicat e class definition: ch/logobject/mlogistics/om/resource/BusinessOrganization_$$_ javassist_272 at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:125) at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:169) ... 137 more Caused by: java.lang.LinkageError: duplicate class definition: test/BusinessOrganization_$$_javassist_272 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:620) at java.lang.ClassLoader.defineClass(ClassLoader.java:465) at sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:585) at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:117) ... 138 more -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://jira.jboss.com/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira