src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/HeapHprofBinWriter.java

*** 30,39 ****
--- 30,40 ----
  import sun.jvm.hotspot.debugger.*;
  import sun.jvm.hotspot.memory.*;
  import sun.jvm.hotspot.oops.*;
  import sun.jvm.hotspot.runtime.*;
  import sun.jvm.hotspot.classfile.*;
+ import sun.jvm.hotspot.gc.z.ZCollectedHeap;
  
  /*
   * This class writes Java heap in hprof binary format. This format is
   * used by Heap Analysis Tool (HAT). The class is heavily influenced
   * by 'hprof_io.c' of 1.5 new hprof implementation.
*** 391,400 ****
--- 392,405 ----
          // open file stream and create buffered data output stream
          fos = new FileOutputStream(fileName);
          out = new DataOutputStream(new BufferedOutputStream(fos));
  
          VM vm = VM.getVM();
+         if (vm.getUniverse().heap() instanceof ZCollectedHeap) {
+             throw new RuntimeException("This operation is not supported with ZGC.");
+         }
+ 
          dbg = vm.getDebugger();
          objectHeap = vm.getObjectHeap();
  
          OBJ_ID_SIZE = (int) vm.getOopSize();