JNI Error with Tomcat

[Dan Barron <db...@dswllc.com>]

Hello,

I am having trouble loading a native library for use within Tomcat web 
applications.  I read the wiki entry and found the latest JNI posts - but I 
still don't quite get it and still have an error.  I'm hoping someone out 
there has been through this and has some suggestions.

My environment is Tomcat 5.0.28, Fedora Core 2, JDK 1.5.0, Apache 2.0.52 
connecting to Tomcat with jk2.

I created a wrapper class to load the library libmpascript.so and placed 
the class file into the <tomcat-root>/shared/classes directory so it would 
load with the built in tomcat shared classloader and be available for all 
web applications.  This sound correct?

  public class MapScriptWrapper {
    static { System.loadLibrary("mapscript"); }
    native void load();
  }

The library lives in /usr/local/lib/special and when starting up tomcat I 
set JAVA_OPTS=-Djava.library.path=/usr/local/lib/special in the 
/etc/init.d/tomcat script.  Does this need to be in 
<tomcat-root>/bin/catalina.sh?  I could also make it a global variable in 
/etc/profile but have not tried that yet.

   excerpt from /etc/init.d/tomcat
   ...
   start() {
     echo -n "Starting tomcat: "
     JAVA_OPTS='-Djava.library.path=/usr/local/lib/special'
     export JAVA_OPTS
     set | grep JAVA
     chown -R $TOMCAT_USER:$TOMCAT_USER /usr/local/tomcat/*
     su -l $TOMCAT_USER -c '/usr/local/tomcat/bin/startup.sh'
     RETVAL=$?
     echo
     [ $RETVAL = 0 ] && touch /var/lock/subsys/tomcat
     return $RETVAL
   }
   ...

There is a correpsonding mapscript.jar file which maps obejcts to the 
library that is available via the CLASSPATH and when I create a jsp file 
and try to create an object that points to the library I get the dreaded 
UnsatisfiedLinkError - which tells me the library is not loaded and available.

java.lang.UnsatisfiedLinkError: new_mapObj 
edu.umn.gis.mapscript.mapscriptJNI.new_mapObj(NativeMethod)
         edu.umn.gis.mapscript.mapObj.<init>(mapObj.java:334)
         org.apache.jsp.mapscript_002dtest_jsp._jspService(mapscript_002dtest_jsp.java:52)
         org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
         javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
         org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
         org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
         org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
         javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	
Any ideas would be appreciated!  Thanks!

Dan Barron 


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