src/hotspot/share/gc/shared/gcConfiguration.cpp

*** 41,51 ****
  
    if (UseConcMarkSweepGC) {
      return ParNew;
    }
  
!   if (UseZGC) {
      return NA;
    }
  
    return DefNew;
  }
--- 41,51 ----
  
    if (UseConcMarkSweepGC) {
      return ParNew;
    }
  
!   if (UseZGC || UseShenandoahGC) {
      return NA;
    }
  
    return DefNew;
  }
*** 65,74 ****
--- 65,78 ----
  
    if (UseZGC) {
      return Z;
    }
  
+   if (UseShenandoahGC) {
+     return Shenandoah;
+   }
+ 
    return SerialOld;
  }
  
  uint GCConfiguration::num_parallel_gc_threads() const {
    return ParallelGCThreads;