src/hotspot/share/gc/z/zArguments.cpp

*** 80,89 ****
--- 80,94 ----
    FLAG_SET_DEFAULT(UseDynamicNumberOfGCThreads, true);
  
    // CompressedOops/UseCompressedClassPointers not supported
    FLAG_SET_DEFAULT(UseCompressedOops, false);
    FLAG_SET_DEFAULT(UseCompressedClassPointers, false);
+   FLAG_SET_DEFAULT(UseSharedSpaces, false);  // requires CompressedOops and CompressedClassPointers
+ 
+   if (DumpSharedSpaces) {
+     vm_exit_during_initialization("DumpSharedSpaces (-Xshare:dump) is not supported with ZGC.");
+   }
  
    // ClassUnloading not (yet) supported
    FLAG_SET_DEFAULT(ClassUnloading, false);
    FLAG_SET_DEFAULT(ClassUnloadingWithConcurrentMark, false);