Using Solaris 9 build 34 nightly Java: fullversion "1.4.0-beta-b55", the
following exception occurs when trying to run Web Start Wizard 3.0 based
wizards. Tried several config and install wizards, they all produced
this type of Java exception trace and would not run.

The base OS system used was Solaris 9 build 33. The above Java via its
SUNWj3rt package was added to the S9 build 33 system for this test. To
duplicate, this package can be found at ...
/net/paradise.eng/export/integrate_dock/s9s_wos/sparc/SUNWj3rt

-------------------------------------------------------
#java sysid
Could not find class during deserialization of the WizardState:java.lang.ClassNotFoundException: com.sun.sysid.core.SysIDServerObject
java.lang.ClassNotFoundException: com.sun.sysid.core.SysIDServerObject
        at java.lang.ClassLoader.findClass(ClassLoader.java:353)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:304)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:260)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:201)
        at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:492)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1377)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1300)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1501)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1164)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:283)
        at java.util.Hashtable.readObject(Hashtable.java:797)
        at sun.misc.Unsafe.invokeSpecial(Native Method)
        at sun.misc.ClassReflector.invokeSpecial(ClassReflector.java:390)
        at $ClassReflector2.readObject(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1597)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1520)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1164)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:283)
        at com.sun.wizards.core.GenericWizardState.setWizardState(GenericWizardState.java:1762)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:30)
        at sun.reflect.InflatableMethodAccessorImpl.invoke(InflatableMethodAccessorImpl.java:46)
        at java.lang.reflect.Method.invoke(Method.java:306)
        at com.sun.wizards.core.ArchiveReader.callObjectMethod(ArchiveReader.java:1283)
        at com.sun.wizards.core.ArchiveReader.<init>(ArchiveReader.java:272)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:33)
        at sun.reflect.InflatableConstructorAccessorImpl.newInstance(InflatableConstructorAccessorImpl.java:38)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:273)
        at sysid.instantiateArchiveReader(ArchiveClassLoader.java:192)
        at sysid.<init>(ArchiveClassLoader.java:142)
        at sysid.main(ArchiveClassLoader.java:1190)
--------------------------------------------------------------------------------



paul.lovvik@eng 2001-03-20
I have created a small test program that clearly demonstrates the problem.

The problem seems to be in the deserialization of a java.lang.Hashtable
object. It seems that the default ClassLoader is being used to load
all of the classes for values stored in the Hashtable. If the default
ClassLoader is not able to find the necessary classes, a ClassNotFoundException
will be thrown.

My attached example program works well under Java 1.1 -> Java 1.3. On
Java 1.4, it fails with the following stack trace:

java.lang.ClassNotFoundException: CustomString
        at java.lang.ClassLoader.findClass(ClassLoader.java:353)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:304)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:260)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:201)
        at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:492)
        at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1377)
        at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1300)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1501)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1164)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:283)
        at java.util.Hashtable.readObject(Hashtable.java:797)
        at sun.misc.Unsafe.invokeSpecial(Native Method)
        at sun.misc.ClassReflector.invokeSpecial(ClassReflector.java:390)
        at $ClassReflector0.readObject(Unknown Source)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1597)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1520)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1164)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:283)
        at MainClass.readStreamBytes(MainClass.java:70)
        at MainClass.runTest(MainClass.java:27)
        at MainClass.main(MainClass.java:81)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:30)
        at sun.reflect.InflatableMethodAccessorImpl.invoke(InflatableMethodAccessorImpl.java:46)
        at java.lang.reflect.Method.invoke(Method.java:306)
        at FileClassLoader.main(FileClassLoader.java:151)
result=test failed.

In the test that generated this stack trace, an instance of CustomString
(which was loaded with a custom ClassLoader) is put into a Hashtable,
the Hashtable is serialized, and then deserialized.

It seems that Hashtable.readObject has changed behavior from Java 1.3 to
Java 1.4, which is the core of our problem.

I have also tried using a Vector to see if it fails in a similar way. It
does not.
paul.lovvik@eng 2001-03-20