[
http://jira.jboss.com/jira/browse/JASSIST-28?page=comments#action_12345512 ]
Shigeru Chiba commented on JASSIST-28:
--------------------------------------
Thank you for the test case.
We (Muga Nishizawa and I) found that the problem is due to a difference in their caching
scheme
between Cglib and Javassist. Cglib records all proxy classes that have been generated but
Javassist
does not for saving memory consumption (or avoiding memory leak). Since your test code
repeatedly
creates the same proxy class, Javassist creates the same class more than once and attempts
to load them.
The loading is rejected by the JVM and an exception is thrown.
We will fix this problem soon (when we find the best caching scheme for proxy classes).
Thank you for your bug report and help!
javassist enhancement failed on deserializing hibernate proxies
---------------------------------------------------------------
Key: JASSIST-28
URL:
http://jira.jboss.com/jira/browse/JASSIST-28
Project: Javassist
Issue Type: Bug
Environment: hibernate 3.2.0GA, javassist 3.3, jboss 4.0.4GA
Reporter: Armin Haaf
Assigned To: Shigeru Chiba
Attachments: TestJavassistSerializationPerformance.java
on deserializing objects load by hibernate on a jbossas with uninitialized proxies we the
following exception on a performance/concurrent testing:
Exception in thread "Thread-7" org.hibernate.HibernateException: Javassist
Enhancement failed: de.mueller.wms.base.model.impl.StorageImpl
at
org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:88)
at
org.hibernate.proxy.pojo.javassist.SerializableProxy.readResolve(SerializableProxy.java:54)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at java.io.ObjectStreamClass.invokeReadResolve(ObjectStreamClass.java:1033)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1728)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at org.jboss.aop.joinpoint.InvocationResponse.readExternal(InvocationResponse.java:122)
at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1755)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1717)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1908)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1832)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1719)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at
org.jboss.remoting.serialization.impl.java.JavaSerializationManager.receiveObject(JavaSerializationManager.java:128)
at
org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:66)
at
org.jboss.remoting.transport.socket.SocketClientInvoker.transport(SocketClientInvoker.java:279)
at org.jboss.remoting.RemoteClientInvoker.invoke(RemoteClientInvoker.java:143)
at org.jboss.remoting.Client.invoke(Client.java:525)
at org.jboss.remoting.Client.invoke(Client.java:488)
at
org.jboss.aspects.remoting.InvokeRemoteInterceptor.invoke(InvokeRemoteInterceptor.java:55)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.aspects.tx.ClientTxPropagationInterceptor.invoke(ClientTxPropagationInterceptor.java:61)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.aspects.security.SecurityClientInterceptor.invoke(SecurityClientInterceptor.java:55)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.remoting.IsLocalInterceptor.invoke(IsLocalInterceptor.java:65)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.stateless.StatelessRemoteProxy.invoke(StatelessRemoteProxy.java:102)
at $Proxy2.executeCommand(Unknown Source)
at
de.mueller.wms.base.service.JndiRemoteLookupDelegateImpl$CommandExecutionInvocationHandler.invoke(JndiRemoteLookupDelegateImpl.java:57)
at $Proxy1.changeStock(Unknown Source)
at de.mueller.wms.base.TestJBossPerformance$1.run(TestJBossPerformance.java:58)
Caused by: java.lang.RuntimeException: by java.lang.LinkageError: duplicate class
definition: de/mueller/wms/base/model/impl/StorageImpl_$$_javassist_1272
at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:174)
at
org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.getProxy(JavassistLazyInitializer.java:79)
... 44 more
Caused by: javassist.CannotCompileException: by java.lang.LinkageError: duplicate class
definition: de/mueller/wms/base/model/impl/StorageImpl_$$_javassist_1272
at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:167)
at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:170)
... 45 more
Caused by: java.lang.LinkageError: duplicate class definition:
de/mueller/wms/base/model/impl/StorageImpl_$$_javassist_1272
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:159)
... 46 more
The performance is also very bad in comparison with cglib proxies (in our performance
test with cglib proxies the test runs 3x faster)
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