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https://issues.apache.org/jira/browse/COLLECTIONS-272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536088
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Henri Yandell commented on COLLECTIONS-272:
-------------------------------------------
Nope, entirely likely that it was just missed. There are a bunch of things in
Collections that aren't serializable and need to be changed (along with a unit
test). It's one of those things where the solution is an order less difficult
than the unit test. Patches very, very welcome.
> Anyone know why the Comparators aren't Serializable?
> -----------------------------------------------------
>
> Key: COLLECTIONS-272
> URL: https://issues.apache.org/jira/browse/COLLECTIONS-272
> Project: Commons Collections
> Issue Type: Improvement
> Components: Comparator
> Reporter: Chaitanya Mutyala
> Fix For: Generics
>
>
> the comparator classes should be serializable. I use the comparator classes
> in my beans and cannot make them serializable because of this inconvenience.
> This is the error when i try to access my beans over an RMI
> java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
> java.io.WriteAbortedException: writing aborted;
> java.io.NotSerializableException:
> org.apache.commons.collections.comparators.TransformingComparator
> at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:157)
> at com.sun.jmx.remote.internal.PRef.invoke(Unknown Source)
> at javax.management.remote.rmi.RMIConnectionImpl_Stub.invoke(Unknown
> Source)
> at
> javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.invoke(RMIConnector.java:972)
> at com.tablus.tem.auto.policy.ClientMBean.doOper(ClientMBean.java:101)
> at com.tablus.tem.auto.policy.ClientMBean.run(ClientMBean.java:69)
> at com.tablus.tem.auto.policy.ClientMBean.main(ClientMBean.java:145)
> Caused by: java.io.WriteAbortedException: writing aborted;
> java.io.NotSerializableException:
> org.apache.commons.collections.comparators.TransformingComparator
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1309)
> 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 java.util.TreeSet.readObject(TreeSet.java:478)
> 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:585)
> at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
> 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.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 java.util.HashMap.readObject(HashMap.java:1066)
> 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:585)
> at
> java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
> at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1809)
> 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.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 sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:290)
> at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:139)
> ... 6 more
> Caused by: java.io.NotSerializableException:
> org.apache.commons.collections.comparators.TransformingComparator
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1081)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
> at java.util.TreeSet.writeObject(TreeSet.java:458)
> 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:585)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
> at java.util.HashMap.writeObject(HashMap.java:1038)
> 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:585)
> at
> java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:917)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1339)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at
> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1375)
> at
> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1347)
> at
> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1290)
> at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1079)
> at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:302)
> at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:258)
> at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:304)
> at sun.rmi.transport.Transport$1.run(Transport.java:153)
> at java.security.AccessController.doPrivileged(Native Method)
> at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
> at
> sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
> at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
> at java.lang.Thread.run(Thread.java:595)
>
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