private int getKeyLength() {
    return (int) (bits1 & 0x003fL);
  }
Do not modify this class. It was generated. Instead modify LeafRegionEntry.cpp and then run
./dev-tools/generateRegionEntryClasses.sh (it must be run from the top level directory).
geode-core/src/main/java/org/apache/geode/internal/cache/entries/VMThinRegionEntryHeapStringKey1.java