session de-serialization issue

[Tom Mader]

Hi-

I have an issue with session persistence that I can't figure out.

I am running:

CentOS 5.2
Tomcat 5.5.23
JDK 1.4.2

I would like my user sessions to be persisted across tomcat restarts.

I would like this to happen using the default write-to-file (SESSIONS.ser)
method of org.apache.catalina.session.StandardManager

It appears that if I try to store a class in the session that contains
anything other than native JDK types, I get a de-serialization error when
the session is loaded after tomcat restarts.

For example, I created the following simple class:

import java.io.*;
public class TestClass implements Serializable {
    private int test;
    public TestClass() {
        test = 1234;
    }
    public int getTest() {
        return test;
    }
}

I can put this class directly into the session and it is successfully
serialized and de-serialized across tomcat restarts.  This is working just
fine.

However, if I create a containing class for my simple class:

import java.io.*;
public class ContainingClass implements Serializable {
    private TestClass testClass;
    public ContainingClass() {
        testClass = new TestClass();
    }
    public TestClass getTestClass() {
        return testClass;
    }
}

I receive the following error upon de-serialization after tomcat restarts:

5-Dec-08 7:02:14 PM org.apache.catalina.session.StandardManager doLoad
SEVERE: IOException while loading persisted sessions:
java.io.InvalidClassException: invalid field type for testClass in class
ContainingClass
   at java.io.ObjectInputStream.readClassDescriptor(libgcj.so.7rh)


This behavior is extremely consistent across all of my testing.

Does anyone have any ideas as to why I can't de-serialize classes that
contain non-native JDK types?

Thank you!
-Tom



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