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From "Shapira, Yoav" <>
Subject RE: Problem with tomcat5 / svn-javahl classes (classloader problem?)
Date Mon, 30 Aug 2004 12:50:58 GMT

Ooh, it can be a pain to debug JNI calls like that which just hang.  Run
it inside a profiler to see where it's hanging, and/or do a thread dump
(send the VM progress a SIGQUIT) to see what's going on.  If it's
hanging in the JNI code, ;(

Yoav Shapira
Millennium Research Informatics

>-----Original Message-----
>From: Nikita Zhuk []
>Sent: Saturday, August 28, 2004 9:07 AM
>Subject: Problem with tomcat5 / svn-javahl classes (classloader
>Hi all,
>I'm having a problem with Tomcat5 (running on FreeBSD 5.2.1 with jdk
>1.4.2) and my webapp, which uses svn-javahl bindings to connect to the
>Subversion reporitory. The idea of my page is simple:
>If http session is new, create svn connection and save in into session.
>If http session already exists, use the svn connection saved into
>Everything works fine during the first run - when I restart tomcat and
>open my JSP page. The session is created, svn connection is created,
>and when I refresh my page I'm using the same svn connection from the
>session just as I should. But if I restart my browser and reopen my JSP
>page ( = create a new session), browser just waits for more data, and
>my Java code seems to hang on line:
>svnClient = new SVNClient();
>of my SVNConnection class. The constructor of SVNClient doesn't take
>any parameters, and it doesn't create any connections, either.
>SVNClient class is in fact an interface to svn-javahl JNI binginds, so
>svn-javahl.jar is placed under $CATALINA_HOME/shared/lib as advised in
>tomcat documentation (to prevent classloader problems with JNI
>If I restart tomcat, my JSP page loads fine again.
>The code itself should be ok, I've created several JUnit tests to test
>my methods and they all succeed.
>Does anyone have any idea how this weird problem could be solved? I
>suppose it's related to tomcat's classloader, but I don't know how to
>fix it.
>Best regards,
>Nikita Zhuk
>Mac OS X & Web developer
>Marko Karppinen & Co. LLC
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