TOMCAT and JNI problem...

[J.Pablo M]

Hello.

I'm running a JSP  based Web aplicacion using Tomcat  wich uses a Java Class
that  loads a
native library (JNI).
The files are created as follows:

 > javac extractor/HTDInterface.java
 > javah extractor.HTDInterface
then I compile my c++ source code with the header file
"extractor_HTDInterface.h" to create
the shared library  "libhtd.so"
create a jar file with the Class that implements JNI call

    static {
       System.loadLibrary("htd");
jar cvf extractor.jar extractor/HTDInterface.class
For testing  a standalone application I set my CLASSPATH to include
extractor.jar
and libhtd.so file is placed inside the JDK at  /JAVA_HOME/jre/lib/i386/
I successfully build and run The standalone application usin the shared
library.
For the web application, extractor.jar is placed at  /common/lib/   TOMCAT
directory
I leave the libhtd.so at the /JAVA_HOME/jre/lib/i386/   JDK directory.
When my JSP based Web application calls the native library method
the Tomcat just STOPS.... it doesn't work  STOPS....
The message is:
     The connection was refused when attempting to contact localhost:8080
I have to run startup.sh script again.
I took off the libhtd.so file from  /JAVA_HOME/jre/lib/i386/ and I placed it
in a different directory outside the tomcat:
           /home/myuser/lib/libhtd.so

Then I made a script to start the tomcat with the LD_LIBRARY_PATH
environment variable set up:
-------------------------------------------------------------
#!/bin/sh
export JAVA_HOME=/opt/java
export CATALINA_HOME=/usr/local/jakarta-tomcat
export PATH=${JAVA_HOME}/bin:${PATH}
export JAVA_PATH=${JAVA_HOME}
# path to load the libhtd.so shared library
export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/home/myuser/lib
cd /usr/local/jakarta-tomcat/bin
sh startup.sh
-------------------------------------------------------------
BUT the same happens when the Web application calls the native library
method
the Tomcat just STOPS.... it doesn't work  ......STOPS....
The message is:
     The connection was refused when attempting to contact localhost:8080
just like when you try to load the web application and the TOMCAT server  is
not UP.
Does anyone knows how to solve this ????

I have read that maybe setting up the CATALINA_OPTS environment variable
can solve this
problem.... BUT I dont know how to set that variable. ???????
I hope this time I've made myself clear

Another thing: I'm working under Red Hat 9.0  TOMCAT 4.1.27 and JDK 1.4.2

Pablo  Vidal

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