--- old/test/lib/sun/hotspot/WhiteBox.java	2017-10-11 15:25:50.523971630 +0200
+++ new/test/lib/sun/hotspot/WhiteBox.java	2017-10-11 15:25:50.330963343 +0200
@@ -530,6 +530,9 @@
   public native int addCompilerDirective(String compDirect);
   public native void removeCompilerDirective(int count);
 
+  // Handshakes
+  public native int handshakeWalkStack(Thread t, boolean all_threads);
+
   // Returns true on linux if library has the noexecstack flag set.
   public native boolean checkLibSpecifiesNoexecstack(String libfilename);
 }