Weblogic.rmi.internal.LocalServerRefMissing

Question

I am Attempting to serialize and deserialize a stateful session
bean. The deserialization seems to be the problem. I have
figured out that the line throwing the error is the "readObject"
line.
A similar problem was reported on Jan 31 2002, but the solution
suggested deals with the "getEJBObject" line. I have tryed to
implement this solution, as you can see below, but since the
error I am getting is thrown before getting to that line, it
makes no difference.
The Exception I am getting is an "InvalidClassException".
The message reads as follows = "weblogic.rmi.internal.
LocalServerRefMissing no-arg constructor for class".
As far as the "no-arg constructor" error goes, as I understand
it I should not be having that problem. My Session bean
implements the SessionBean interface and does not explicitly
extend anything, so by default it extends Object, right?!
Object has a no-args constructor, so there should be no problem.
My code is as follows:
---SERIALIZATION---
Handle msaHandle = contributions.getHandle();
ObjectOutputStream toFile = new ObjectOutputStream(
new FileOutputStream(handleFile));
toFile.writeObject(msaHandle);
toFile.close();
---DESERIALIZATION---
ObjectInputStream fromFile = new ObjectInputStream(
new FileInputStream(handleFile));
Handle msaHandle = (Handle) fromFile.readObject();
//MsaSession contributions =
(MsaSession) msaHandle.getEJBObject();
MsaSession contributions = (MsaSession) javax.rmi.PortableRemote
Object.narrow(msaHandle.getEJBObject(), MsaSession.class);
fromFile.close();
I have tried to print "classname" (available in the
InvalidClassException class), but only get null as the value.
Anyone have any ideas?
Matthew

Answer 1

I am Attempting to serialize and deserialize a stateful session
bean. The deserialization seems to be the problem. I have
figured out that the line throwing the error is the "readObject"
line.
A similar problem was reported on Jan 31 2002, but the solution
suggested deals with the "getEJBObject" line. I have tryed to
implement this solution, as you can see below, but since the
error I am getting is thrown before getting to that line, it
makes no difference.
The Exception I am getting is an "InvalidClassException".
The message reads as follows = "weblogic.rmi.internal.
LocalServerRefMissing no-arg constructor for class".
As far as the "no-arg constructor" error goes, as I understand
it I should not be having that problem. My Session bean
implements the SessionBean interface and does not explicitly
extend anything, so by default it extends Object, right?!
Object has a no-args constructor, so there should be no problem.
My code is as follows:
---SERIALIZATION---
Handle msaHandle = contributions.getHandle();
ObjectOutputStream toFile = new ObjectOutputStream(
new FileOutputStream(handleFile));
toFile.writeObject(msaHandle);
toFile.close();
---DESERIALIZATION---
ObjectInputStream fromFile = new ObjectInputStream(
new FileInputStream(handleFile));
Handle msaHandle = (Handle) fromFile.readObject();
//MsaSession contributions =
(MsaSession) msaHandle.getEJBObject();
MsaSession contributions = (MsaSession) javax.rmi.PortableRemote
Object.narrow(msaHandle.getEJBObject(), MsaSession.class);
fromFile.close();
I have tried to print "classname" (available in the
InvalidClassException class), but only get null as the value.
Anyone have any ideas?
Matthew