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

[Ortwin Glück (JIRA)]

Javassist lazy proxy factoring not thread-safe
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                 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

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