src/java.base/share/classes/java/lang/Runtime.java

@@ -728,11 +728,11 @@
      * detailed instruction trace it is performing.
      *
      * @param   on   <code>true</code> to enable instruction tracing;
      *               <code>false</code> to disable this feature.
      */
-    public native void traceInstructions(boolean on);
+    public void traceInstructions(boolean on) { }
 
     /**
      * Enables/Disables tracing of method calls.
      * If the <code>boolean</code> argument is <code>true</code>, this
      * method suggests that the Java virtual machine emit debugging

@@ -746,11 +746,11 @@
      * virtual machine cease emitting per-call debugging information.
      *
      * @param   on   <code>true</code> to enable instruction tracing;
      *               <code>false</code> to disable this feature.
      */
-    public native void traceMethodCalls(boolean on);
+    public void traceMethodCalls(boolean on) { }
 
     /**
      * Loads the native library specified by the filename argument.  The filename
      * argument must be an absolute path name.
      * (for example