Subscribers list over Hessian causes org.hibernate.LazyInitializationException

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What steps will reproduce the problem?
1. access unsubscribe() for ListMgrBean over Hessian

What is the expected output? What do you see instead?

29-Jun-2011 06:20:27 org.hibernate.LazyInitializationException <init>
SEVERE: failed to lazily initialize a collection, no session or session was 
closed
org.hibernate.LazyInitializationException: failed to lazily initialize a 
collection, no session or session was closed
    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
    at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
    at org.hibernate.collection.PersistentSet.add(PersistentSet.java:212)
    at com.caucho.hessian.io.CollectionDeserializer.readLengthList(CollectionDeserializer.java:93)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1746)
    at com.caucho.hessian.io.UnsafeDeserializer$ObjectFieldDeserializer.deserialize(UnsafeDeserializer.java:417)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:239)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:150)
    at com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2188)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1695)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1679)
    at com.caucho.hessian.io.UnsafeDeserializer$ObjectFieldDeserializer.deserialize(UnsafeDeserializer.java:417)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:239)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:150)
    at com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2188)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2109)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2093)
    at com.caucho.hessian.io.CollectionDeserializer.readLengthList(CollectionDeserializer.java:93)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1781)
    at com.caucho.hessian.io.Hessian2Input.readReply(Hessian2Input.java:346)
    at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:194)
    at $Proxy6.getSubscribers(Unknown Source)
    at uk.co.leadseeker.maillist.ListServiceBean.unsubscribe(ListServiceBean.java:88)
    at uk.co.leadseeker.maillist.MaillistServiceTests.testLists(MaillistServiceTests.java:40)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:74)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:673)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:846)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1170)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.runWorkers(TestRunner.java:1147)
    at org.testng.TestRunner.privateRun(TestRunner.java:749)
    at org.testng.TestRunner.run(TestRunner.java:600)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:317)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:312)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:274)
    at org.testng.SuiteRunner.run(SuiteRunner.java:223)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1039)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:964)
    at org.testng.TestNG.run(TestNG.java:900)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:110)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:174)
    at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
com.caucho.hessian.client.HessianRuntimeException: 
com.caucho.hessian.io.HessianFieldException: 
org.subethamail.core.lists.i.RoleData.permissions: java.util.Set cannot be 
assigned from null
    at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:221)
    at $Proxy6.getSubscribers(Unknown Source)
    at uk.co.leadseeker.maillist.ListServiceBean.unsubscribe(ListServiceBean.java:88)
    at uk.co.leadseeker.maillist.MaillistServiceTests.testLists(MaillistServiceTests.java:40)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:74)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:673)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:846)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1170)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:109)
    at org.testng.TestRunner.runWorkers(TestRunner.java:1147)
    at org.testng.TestRunner.privateRun(TestRunner.java:749)
    at org.testng.TestRunner.run(TestRunner.java:600)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:317)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:312)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:274)
    at org.testng.SuiteRunner.run(SuiteRunner.java:223)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1039)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:964)
    at org.testng.TestNG.run(TestNG.java:900)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:110)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:205)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:174)
    at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:85)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: com.caucho.hessian.io.HessianFieldException: 
org.subethamail.core.lists.i.RoleData.permissions: java.util.Set cannot be 
assigned from null
    at com.caucho.hessian.io.UnsafeDeserializer.logDeserializeError(UnsafeDeserializer.java:774)
    at com.caucho.hessian.io.UnsafeDeserializer$ObjectFieldDeserializer.deserialize(UnsafeDeserializer.java:421)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:239)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:150)
    at com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2188)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1695)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1679)
    at com.caucho.hessian.io.UnsafeDeserializer$ObjectFieldDeserializer.deserialize(UnsafeDeserializer.java:417)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:239)
    at com.caucho.hessian.io.UnsafeDeserializer.readObject(UnsafeDeserializer.java:150)
    at com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2188)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2109)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2093)
    at com.caucho.hessian.io.CollectionDeserializer.readLengthList(CollectionDeserializer.java:93)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1781)
    at com.caucho.hessian.io.Hessian2Input.readReply(Hessian2Input.java:346)
    at com.caucho.hessian.client.HessianProxy.invoke(HessianProxy.java:194)
    ... 34 more
Caused by: org.hibernate.LazyInitializationException: failed to lazily 
initialize a collection, no session or session was closed
    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:383)
    at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:375)
    at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:368)
    at org.hibernate.collection.PersistentSet.add(PersistentSet.java:212)
    at com.caucho.hessian.io.CollectionDeserializer.readLengthList(CollectionDeserializer.java:93)
    at com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:1746)
    at com.caucho.hessian.io.UnsafeDeserializer$ObjectFieldDeserializer.deserialize(UnsafeDeserializer.java:417)
    ... 49 more

Original issue reported on code.google.com by gilberthuph@gmail.com on 29 Jun 2011 at 4:36