FULL PRODUCT VERSION :
java version "1.6.0"
Java(TM) SE Runtime Environment (build 1.6.0-b105)
Java HotSpot(TM) Server VM (build 1.6.0-b105, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.8-2-k7-smp #1 SMP Tue Aug 16 14:38:08 UTC 2005 i686 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
When running against a custom JNI library linked against JAWT, load of that library fails with an UnsatisfiedLinkError for libmawt.so unless LD_LIBRARY_PATH is explicitly set to include it.

The error was introduced with 1.5 (presumably with the introduction  of the different subdirectories (headless/motif21/xawt) for libmawt.so. So code which runs under 1.4 will not run under 1.5 or 1.6.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile a native method which references something from JAWT into a JNI library.

Load the library in a Java application.

Load fails with UnsatisfiedLinkError.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should not have to explicitly specify location of the mawt library.
ACTUAL -
Custom JNI library is found, but dependent library libmawt.so is not.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.UnsatisfiedLinkError: /path/to/libjnidispatch.so: libmawt.so: cannot open shared object file: No such file or directory

(thrown from System.loadLibrary("jnidispatch"))


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
// Sample native method which references JAWT

#define USE_JAWT
#ifdef USE_JAWT
#include <jawt.h>
// not yet working on OSX
#ifndef __APPLE__
#include <jawt_md.h>
#endif
#endif

JNIEXPORT jint JNICALL
Java_com_sun_jna_Native_getWindowHandle(JNIEnv *env, jobject unused, jobject w) {
  jint handle = 0;
#ifdef USE_JAWT
  JAWT awt;
  awt.version = JAWT_VERSION_1_4;
  if (JAWT_GetAWT(env, &awt)) {
    JAWT_DrawingSurface* ds;
    JAWT_DrawingSurfaceInfo* dsi;
    jint lock;

    ds = awt.GetDrawingSurface(env, w);
    if (ds != NULL) {
      lock = ds->Lock(ds);
      dsi = ds->GetDrawingSurfaceInfo(ds);
      if (dsi != NULL) {
#ifdef _WIN32
        JAWT_Win32DrawingSurfaceInfo* wdsi =
          (JAWT_Win32DrawingSurfaceInfo*)dsi->platformInfo;
        handle = (jint)wdsi->hwnd;
#elif __APPLE__
#else
        JAWT_X11DrawingSurfaceInfo* xdsi =
          (JAWT_X11DrawingSurfaceInfo*)dsi->platformInfo;
        handle = xdsi->drawable;
#endif

      }
      ds->Unlock(ds);
      awt.FreeDrawingSurface(ds);
    }
  }
#endif

  if (handle == 0) {
    throwByName(env, "java/lang/UnsupportedOperationException",
                "Can't get native handle");
  }
  return handle;
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Put path to libmawt.so explicitly into LD_LIBRARY_PATH.