[Bug java/12940] New: GCJ 3.3.1 on Windows 2002 - java.lang.System.loadLibrary("JniLayer"); does not work at runtime.

[Bug java/12940] New: GCJ 3.3.1 on Windows 2002 - java.lang.System.loadLibrary("JniLayer"); does not work at runtime.

[canutf at cadence dot com]

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PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12940

           Summary: GCJ 3.3.1 on Windows 2002 -
                    java.lang.System.loadLibrary("JniLayer"); does not work
                    at runtime.
           Product: gcc
           Version: 3.3.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: java
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: canutf at cadence dot com
                CC: gcc-bugs at gcc dot gnu dot org

I developed a java software with a JNI layer. This java software is built and
released only for Windows platforms
The JNI layer is built with CL (Microsoft compiler). It produced a dll. Let’s
call it JniLayer.dll.
Everything is working fine with the JVM (i.e. java) delivered by SUN. 
Note: JniLayer.dll is in a folder pointed by the PATH environment variable.

For performance reason, I would like to use GCJ to compile my java code to a
Win32 executable without touching my JNI layer. I believe that it is possible by
using the GCJ –fjni option.

I’m able to produce my Win32 executable. Let’s called it MyProg.exe.

When I run MyProg.exe I got this following exception : Exception in thread
"main" java.lang.UnsatisfiedLinkError: JniLayer: file not found.

I tried:
- to put JniLayer.dll into the current working directory (where MyProg.exe is
executed)
- to put JniLayer.dll where MyProg.exe reside on the file system.
- When I compiled MyProg.exe with gcj, I added the property
–Djava.library.path=. to force MyProg.exe to find JniLayer.dll in the current
working directory.
- I create a LD_LIBRARY_PATH environment variable to point to the current
working directory. (Where is JniLayer.dll)

For all these tries I got always the same exception (i.e. Exception in thread
"main" java.lang.UnsatisfiedLinkError: JniLayer: file not found.)
What should I do to make it working?

Note: here is the peace of code loading the JniLayer.dll
...
public class CJniLayerWrapper {
	/* a "JniLayer.dll" SHOULD EXIST in the PATH Env. Var. */
	static {
		java.lang.System.loadLibrary("JniLayer");
	}
...
}

Thanks in advance for your help.
Best regards,
FRED.

[Bug java/12940] GCJ 3.3.1 on Windows 2002 - java.lang.System.loadLibrary("JniLayer"); does not work at runtime.

[green at redhat dot com]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12940



------- Additional Comments From green at redhat dot com  2003-11-07 15:10 -------
I don't believe System.loadLibrary() works with static Windows executables.  Try
linking your JNI library to the executable directly instead of using
System.loadLibrary().

AG

[Bug libgcj/12940] GCJ 3.3.1 on Windows 2002 - java.lang.System.loadLibrary("JniLayer"); does not work at runtime.

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2003-12-31 19:23 -------
Should be fixed now for 3.4 with the import of libltdl.

*** This bug has been marked as a duplicate of 13056 ***

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
          Component|java                        |libgcj
         Resolution|                            |DUPLICATE


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12940