diff --git a/make/config/jogl/glx-CustomCCode.c b/make/config/jogl/glx-CustomCCode.c
index b4b4f5b..7cbddc8 100644
--- a/make/config/jogl/glx-CustomCCode.c
+++ b/make/config/jogl/glx-CustomCCode.c
@@ -91,7 +91,7 @@ Java_jogamp_opengl_x11_glx_GLX_dispatch_1glXChooseFBConfig(JNIEnv *env, jclass _
    * Bug 961: Validate returned 'GLXFBConfig *', i.e. remove NULL pointer. 
    * Note: sizeof(GLXFBConfig) == sizeof(void*), a.k.a a pointer
    */
-  // fprintf(stderr, "glXChooseFBConfig.0: Count %d\n", count);
+  fprintf(stderr, "before glXChooseFBConfig.0: Count %d\n", count);
   i=0;
   while( i < count ) {
     if( NULL == _res[i] ) {
@@ -103,8 +103,8 @@ Java_jogamp_opengl_x11_glx_GLX_dispatch_1glXChooseFBConfig(JNIEnv *env, jclass _
        i++;
     }
   }
-  // fprintf(stderr, "glXChooseFBConfig.X: Count %d\n", count);
-
+  fprintf(stderr, "after glXChooseFBConfig.X: Count %d\n", count);
+  fprintf(stderr, "copy bytes %d\n", count * sizeof(GLXFBConfig));
   jbyteCopy   = JVMUtil_NewDirectByteBufferCopy(env, _res, count * sizeof(GLXFBConfig));
   XFree(_res);
 
@@ -132,7 +132,7 @@ Java_jogamp_opengl_x11_glx_GLX_dispatch_1glXGetFBConfigs(JNIEnv *env, jclass _un
   _res = (* ptr_glXGetFBConfigs) ((Display *) (intptr_t) dpy, (int) screen, (int *) _nelements_ptr);
   count = _nelements_ptr[0];
   if (NULL == _res) return NULL;
-
+  fprintf(stderr, "before glXGetFBConfigs.0: Count %d\n", count);
   /**
    * Bug 961: Validate returned 'GLXFBConfig *', i.e. remove NULL pointer. 
    * Note: sizeof(GLXFBConfig) == sizeof(void*), a.k.a a pointer
@@ -148,7 +148,7 @@ Java_jogamp_opengl_x11_glx_GLX_dispatch_1glXGetFBConfigs(JNIEnv *env, jclass _un
        i++;
     }
   }
-
+  fprintf(stderr, "after glXGetFBConfigs.X: Count %d\n", count);
   jbyteCopy   = JVMUtil_NewDirectByteBufferCopy(env, _res, count * sizeof(GLXFBConfig));
   XFree(_res);
 
@@ -175,7 +175,7 @@ Java_jogamp_opengl_x11_glx_GLX_dispatch_1glXChooseVisual(JNIEnv *env, jclass _un
   assert(ptr_glXChooseVisual != NULL);
   _res = (* ptr_glXChooseVisual) ((Display *) (intptr_t) dpy, (int) screen, (int *) _attribList_ptr);
   if (NULL == _res) return NULL;
-
+  
   jbyteCopy   = JVMUtil_NewDirectByteBufferCopy(env, _res, sizeof(XVisualInfo));
   XFree(_res);
 
diff --git a/make/config/jogl/glx-CustomJavaCode.java b/make/config/jogl/glx-CustomJavaCode.java
index 5a3ea39..a24fe5f 100644
--- a/make/config/jogl/glx-CustomJavaCode.java
+++ b/make/config/jogl/glx-CustomJavaCode.java
@@ -15,6 +15,7 @@
     if( attributes.remaining() > values.remaining() ) {
         throw new RuntimeException("not enough values "+values+" for attributes "+attributes);
     }
+    
     final long __addr = glxProcAddressTable._addressof_glXGetFBConfigAttrib;
     return dispatch_glXGetFBConfigAttributes(dpy, config, attributes.remaining(), attributes, Buffers.getDirectBufferByteOffset(attributes), 
                                              values, Buffers.getDirectBufferByteOffset(values), __addr);
@@ -50,8 +51,12 @@
     if (__addr_ == 0) {
       throw new GLException("Method \"glXChooseFBConfig\" not available");
     }
-    final ByteBuffer _res = dispatch_glXChooseFBConfig(dpy, screen, attribList, Buffers.getDirectBufferByteOffset(attribList), nitems, Buffers.getDirectBufferByteOffset(nitems), __addr_);
+    Thread.dumpStack();
+    ByteBuffer _res = dispatch_glXChooseFBConfig(dpy, screen, attribList, Buffers.getDirectBufferByteOffset(attribList), nitems, Buffers.getDirectBufferByteOffset(nitems), __addr_);
     if (_res == null) return null;
+    System.out.println("_res!=null "+ _res);
+    System.out.println("native order"+ Buffers.nativeOrder(_res));
+    System.out.println("wrap"+ PointerBuffer.wrap(Buffers.nativeOrder(_res)));
     return PointerBuffer.wrap(Buffers.nativeOrder(_res));
   }
 
@@ -90,7 +95,8 @@
     if (__addr_ == 0) {
       throw new GLException("Method \"glXChooseVisual\" not available");
     }
-    final ByteBuffer _res = dispatch_glXChooseVisual(dpy, screen, attribList, Buffers.getDirectBufferByteOffset(attribList), __addr_);
+    Thread.dumpStack();
+    ByteBuffer _res = dispatch_glXChooseVisual(dpy, screen, attribList, Buffers.getDirectBufferByteOffset(attribList), __addr_);
     if (_res == null) return null;
     return XVisualInfo.create(Buffers.nativeOrder(_res));
   }