Ahh Native Library Hell

["Collins, Jim" <ji...@uk.nomura.com>]

Hi all,

I have been having a lot of trouble trying to get a servlet to call some
native methods. My first servlet I deployed via the manager app, the first
time everything went OK. When I removed the app and deployed it again I got
errors because the native library had already been loaded, I know why this
happens and thought I could just catch the exception and ignore it and then
call my native methods. This did not work however and the code just hung in
the native method call.


What I have now tried to do is deploy a very simple servlet as a war file
and simply loads the native library and then calls a couple of init methods.
This servlet will not be redeployed so it is should be OK. The servlet loads
the native library with no problem but now when it calls a native method I
get:

java.lang.UnsatisfiedLinkError: dmSetConfigFile
"snip"

The servlet that I loaded with the manager app could call native methods
without any problems but this servlet can't. Has anyone any ideas at all
what I can do? I have searched through the mail archives with no luck. I am
running Tomcat 4.1.3 on Solaris 8 using jdk 1.4. I have put the library and
jar file in <Jakarta_home>/common/lib. I have set the LD_LIBRARY_PATH to
point to where the library is, however I load the library with
System.load("/home/me/jakarta-tomcat-4.1.3/common/lib/libDm3.1.6_NativeBridg
e.so.1") not loadLibrary.

Thanks for your help.

Jim.


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