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Subject Re: JNI in Tomcat6
Date Wed, 02 May 2007 18:54:25 GMT
Caldarale, Charles R wrote:
>> From: Martin Gainty [] 
>> Subject: Re: JNI in Tomcat6
>> usually the binaries are located in %JAVA_HOME%/jre/bin
> Only DLLs that are part of the JVM should be placed in
> %JAVA_HOME%/jre/bin; this is not an appropriate location for
> application-specific native code.
>> change LD_LIBRARY_PATH in jvm.cfg to point to the folder 
>> containing your DLL
> You can't set LD_LIBRARY_PATH in jvm.cfg (at least not in the one in
> %JAVA_HOME%/jre/lib/[arch] for a Sun-based JVM; I know of no other
> locations for jvm.cfg).  The jvm.cfg file is only for configuring which
> JVMs are available (just client and server, these days).  The jvm.cfg
> mechanism is expected to disappear when the client and server JVMs are
> finally integrated into a single JVM.  (If you want to see how jvm.cfg
> is processed, set the env var _JAVA_LAUNCHER_DEBUG to any value when you
> start the JVM from a command prompt.)

I'm feeling a bit of deja vu here.

> Now back to Christian's original question:
>> Where do i have to place the DLL File, that the 
>> Classloader will find it?
> The JVM finds native libraries by looking at the system property
> java.library.path.  On Windows, the default value of this property is
> taken from the PATH environment variable, prefixed with a few
> directories the JVM launcher knows about (e.g., C:\WINDOWS\system32).
> The LD_LIBRARY_PATH environment variable is not used at all on Windows.
> On Linux/UNIX systems, the default java.library.path includes various
> directories from the JVM installation plus a few standard locations.
> For example, on one of our SUSE boxes, it's:
> /common/jdk6/jre/lib/amd64/server:/common/jdk6/jre/lib/amd64:/common/jdk
> 6/jre/../lib/amd64:/usr/java/packages/lib/amd64:/lib:/usr/lib
> On Linux/UNIX, the LD_LIBRARY_PATH environment variable can be used to
> modify the above list; whatever is specfied with that variable is
> inserted in the list just prior to the first /usr entry.
> The default value can be overridden by specifying
> -Djava.library.path=<whatever> on the command line for any platform.  If
> Tomcat is running as a Windows service, you can use the tomcat?w.exe
> utility to set whatever value you want for the java.library.path
> property.  On a running Tomcat, use the System Information -> System
> Properties screen of Lambda Probe ( to display all
> of the property names and values.
>  - Chuck
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