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Re: JNI Lib Location when Loading from Java Applet on OS 10.2

Greg, thanks for the answer!
I tried doing all the workarounds with the path
location and supplying the full path in the
System.loadLibrary() call and it still doesn't work.
My java jar and native code are not located in the
same extensions folder since the jar file is
downloaded from a server... still, it is able to load
the library from
/System/Library/Frameworks.../Libraries location.

I also tried Greg's suggestion of checking out the
system properties: "java.library.path" and
"java.ext.dirs". it seems that if i place the lib in
any path of the java.ext.dirs it cannot be loaded.

i'm desperate here.. any ideas?

thanks,
Noa

--------------------------------------------
Date: Mon, 7 Jul 2003 13:11:55 -0700
To: email@hidden
From: Greg Guerin <email@hidden>
Subject: Re: JNI Lib Location when Loading from Java
Applet on OS 10.2

Noa Yissar <email@hidden> wrote:

>Here's what I tried:
>the library is named libxxx.jnilib, as required. If I
>locate the library in /Library/Java/Extensions folder
>and run a Java application such as the JNISample, the
>lib is found and it works fine. However, in my case
>the library is loaded from an applet that's activated
>from an IE web page. More specifically, an html page
>with Java script loads an applet that is wrapped in a
>signed jar file from our server. This applet calls
>"System.loadLibrary(xxx)".

At a minimum, I think both the JNI-lib file and the
Java code loading
it
and linking to its native methods must be in the same
extensions
directory.
It's for security reasons.

This assumes that MSIE is even looking in the Java
extensions
directories.
You didn't mention an MSIE version, and what it does
may be
version-dependent. You should be able to calibrate
your expectations
by
examining the values of two system properties:
"java.library.path" and
"java.ext.dirs". The first is a series of locations
from which only
native
libs are loaded. The second is a series of locations
from which jars
or
native libs are loaded. Some systematic experiments
with a jar-file
and
jni-file may also be useful.

If nothing else works in MSIE, you can always fall
back to using
System.load() and give an absolute pathname starting
with
"/Library/Java/Extensions/" (but permissions may be
problematic). Or
you
can build up a pathname from the "user.home" property
and
"Library/Java/Extensions". I'd only do that if an
exception is thrown
by
loadLibrary(). Also, this approach may require
permissions in the
security
policies file. You should be able to tell by whether
it throws a
SecurityException or an UnsatisfiedLinkError.

-- GG



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