--- old/test/testlibrary/whitebox/sun/hotspot/WhiteBox.java	2014-11-26 20:49:54.716203408 +0300
+++ new/test/testlibrary/whitebox/sun/hotspot/WhiteBox.java	2014-11-26 20:49:54.464203412 +0300
@@ -149,7 +149,14 @@
   public native Object[] getNMethod(Executable method, boolean isOsr);
   public native long    allocateCodeBlob(int size, int type);
   public native void    freeCodeBlob(long addr);
-  public native void    forceNMethodSweep();
+  public        void    forceNMethodSweep() {
+    try {
+        forceNMethodSweep0().join();
+    } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+    }
+  }
+  public native Thread  forceNMethodSweep0();
   public native Object[] getCodeHeapEntries(int type);
   public native int     getCompilationActivityMode();
   public native Object[] getCodeBlob(long addr);