Where does a file called "sun_jch.jar" come from?

Hi,
we're using jdk142_05 from Sun with Bea Weblogic on a Sun Fire V240 running Solaris 8.
Some days ago, as part of a testing, the network interface connecting this server to the database server (Oracle 9) was shut down abruptly while Weblogic was running.
After restoring the connection to the database, all the applications using that jdk were perfoming very slowly their database queries (even if they were outside Weblogic).
It took us a long time to determine that a jar file called sun_jch.jar located in the jdk142_05/jre/lib/ext folder was the root cause of the problem.
It contained a lot of classes related to oracle and their creation date was exactly the date when the connection to the database was cut.
Does anybody know is this file comes from Weblogic or from the JVM itself? I can not find any information about it over internet.
Thanks!

Hello again,
yesterday I found a tool called "Javac Compiler Helper", available at http://freshmeat.net/projects/jch/.
I don't know it this tool can anyhow be related to the file I mentioned, as the initials match "sun_jch.tar".
We're not using this tool, but it's the only thing I've found over Intertet.
Regards!

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