@Override
  public void copyRecoveredEntries(RegionMap rm) {
    throw new IllegalStateException("copyRecoveredEntries should never be called on proxy");
  }
Provides a dummy implementation of RegionEntry so that basicPut can return an instance that
make the upper levels think it did the put.
geode-core/src/main/java/org/apache/geode/internal/cache/ProxyRegionMap.java