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From "Jonathan Eric Miller" <jemil...@uchicago.edu>
Subject Re: I can't stand the "UnsatisfiedLinkErrors" anymore withTomcat 4.0.1!
Date Tue, 12 Feb 2002 17:50:46 GMT
Yeah, you have to put classes that use JNI in a lib directory such as
common/lib rather than WEB-INF/lib, otherwise you will get errors when your
servlet gets reloaded. There is a note about it in the release notes.

Also, you can set CATALINA_OPTS=-Djava.library.path=<path containing your
native code> to specify the directory that your native code is located in.

Jon

----- Original Message -----
From: "Larry Meadors" <Larry.Meadors@plumcreek.com>
To: <tomcat-user@jakarta.apache.org>
Sent: Monday, February 11, 2002 4:42 PM
Subject: Re: I can't stand the "UnsatisfiedLinkErrors" anymore withTomcat
4.0.1!


> >>Can the class loader used to load the classes in the web app load
> native libraries...
> I think that classes in the web app can call native methods, but I am
> by no stretch of the imagination an expert on this. When I ran the
> Oracle OCI JDBC driver (which uses native code) it worked in the
> WEB-INF/lib directory or in the common/lib directory. I had a separate
> issue when reloading classes, but I think that was Oracle specific.
>
> >>Do I really need to load my class with the native methods...how?
> I also think that classes in the $CATALINA_HOME/common/lib get loaded
> by the "common" classloader.
>
> >>I am a big fan of open source, but the troubles I am having...
> I feel your pain. Best of luck getting this going, be sure to share
> when you do to spare the next poor bugger. ;-)
>
> Larry
>
> >>> jmboone@telocity.com 02/08/02 08:29PM >>>
> Hi All,
>
> After more that a week of messing with it, I'm convinced there is no
> way to call native methods within Tomcat. I have read the class loader
> INFO file 100 times, searched and read the list serve archives for
> hours, followed all the suggestions found within those messages, and
> still I receive "UnsatisfiedLinkErrors" whenever I attempt to run native
> methods.
>
> Facts:
>
> * I can execute the methods with no problems when run from the command
> line, but I get "UnsatisfiedLinkErrors" running under Tomcat 4.0.1.
> Hummm...
>
> Questions:
>
> * Can the class loader used to load the classes in the web app load
> native libraries with System.loadLibrary? Some list serve messages say
> no, others suggest yes.
> * Do I really need to load my class with the native methods in the
> "Common" class loader?  If so, how? None of the methods I have tried
> work.
> * Basically, how do I need to sweet talk Tomcat to make it execute my
> native methods?
>
> I'm really frustrated and desperate!  If anyone has made this work,
> please share your wisdom. I am a big fan of open source, but the
> troubles I am having really make me wish I could call tech support at
> some software company!  Any suggestions are welcome.  Thanks..
>
> Cheers,
>
> Jim Boone
>
>


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