oracle DOM object in session

[Ollier John <jo...@capula.co.uk>]

This is rather vague problem, but I am hoping that someone will be able to
point me in the right direction.

I am using Tomcat4.0 on Windows 2000.

When you visit the 1st page on our web site, a Journey object is created
with an instance variable "doc" which is an Oracle XDBDocument (Oracle's
implementation of org.w3c.dom.Document) extracted from Oracle 9.2.0.3 using
JDBC.  

The Journey object is attached to the HttpSession object.

When you go to the 2nd page, the servlet takes the Journey object from the
Session and performs some manipulation on "doc". 

Sometimes, but not always, I get an error like the one shown below. But the
exception is thrown in different methods one different occasions, although
it is always one of Oracle's native methods which underlie a DOM method.

Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0xa3d7d6c
Function name=Java_oracle_xdb_dom_XDBNode_getFirstChildNative
Library=C:\oracle\ora90\bin\orageneric9.dll
Current Java thread:
at oracle.xdb.dom.XDBNode.getFirstChildNative(Native Method)
at oracle.xdb.dom.XDBNode.getFirstChild(XDBNode.java:337)

If the servlet creates a new Journey from the database when the 2nd page is
loaded rather than taking it from the session, the error does not occur.

If the same methods are invoked through the "main" method of the Journey
class, there is no error.

The same code works OK when the "doc" is an Xindice Document extracted from
Xindice.

Does anyone have any ideas? Could it be that something is being garbage
collected when it shouldn't be?

Thanks in advance.

John


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