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From "Brian Hanuska" <>
Subject Tomcat and JNI
Date Tue, 29 Jan 2002 16:02:27 GMT
What ClassLoader should load the java classes that contain JNI calls?

Currently the java classes that load the JNI calls are in the global web.xml file, in the
jsp servlet's classpath:

The Tomcat docs have:
Tomcat 4.0 and JNI Based Applications:

Applications that require native libraries must ensure that the libraries have
been loaded prior to use.  Typically, this is done with a call like:

  static {

in some class.  However, the application must also ensure that the library is
not loaded more than once.  If the above code were placed in a class inside
the web application (i.e. under /WEB-INF/classes or /WEB-INF/lib), and the
application were reloaded, the loadLibrary() call would be attempted a second

To avoid this problem, place classes that load native libraries outside of the
web application, and ensure that the loadLibrary() call is executed only once
during the lifetime of a particular JVM.

Any help would be appreciated.


Brian Hanuska

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