Program: 49883
Project: 49883
Buggy source:
public <K,V,E>Object getClientProxy(Object o){
  Object proxy=mapProxies.get(o);
  if (proxy == null) {
synchronized (mapProxies) {
      proxy=mapProxies.get(o);
      if (proxy == null) {
        if (o instanceof String) {
          String name=(String)o;
          if (name.startsWith(Prefix.MAP)) {
            proxy=new MapClientProxy<K,V>(this,name);
          }
 else           if (name.startsWith(Prefix.AS_LIST)) {
            proxy=new ListClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.SET)) {
            proxy=new SetClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.QUEUE)) {
            proxy=new QueueClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.TOPIC)) {
            proxy=new TopicClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.ATOMIC_NUMBER)) {
            proxy=new AtomicNumberClientProxy(this,name);
          }
 else           if (name.startsWith(Prefix.IDGEN)) {
            proxy=new IdGeneratorClientProxy(this,name);
          }
 else           if (name.startsWith(Prefix.MULTIMAP)) {
            proxy=new MultiMapClientProxy(this,name);
          }
 else           if (name.startsWith(Prefix.SEMAPHORE)) {
            proxy=new SemaphoreClientProxy(this,name);
          }
 else {
            proxy=new LockClientProxy(o,this);
          }
          mapProxies.put(o,proxy);
        }
 else {
          proxy=new LockClientProxy(o,this);
        }
      }
    }
  }
  return mapProxies.get(o);
}

Fixed version (ground truth):
public <K,V,E>Object getClientProxy(Object o){
  Object proxy=mapProxies.get(o);
  if (proxy == null) {
synchronized (mapProxies) {
      proxy=mapProxies.get(o);
      if (proxy == null) {
        if (o instanceof String) {
          String name=(String)o;
          if (name.startsWith(Prefix.MAP)) {
            proxy=new MapClientProxy<K,V>(this,name);
          }
 else           if (name.startsWith(Prefix.AS_LIST)) {
            proxy=new ListClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.SET)) {
            proxy=new SetClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.QUEUE)) {
            proxy=new QueueClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.TOPIC)) {
            proxy=new TopicClientProxy<E>(this,name);
          }
 else           if (name.startsWith(Prefix.ATOMIC_LONG)) {
            proxy=new AtomicNumberClientProxy(this,name);
          }
 else           if (name.startsWith(Prefix.COUNT_DOWN_LATCH)) {
          }
 else           if (name.startsWith(Prefix.IDGEN)) {
            proxy=new IdGeneratorClientProxy(this,name);
          }
 else           if (name.startsWith(Prefix.MULTIMAP)) {
            proxy=new MultiMapClientProxy(this,name);
          }
 else           if (name.startsWith(Prefix.SEMAPHORE)) {
            proxy=new SemaphoreClientProxy(this,name);
          }
 else {
            proxy=new LockClientProxy(o,this);
          }
          mapProxies.put(o,proxy);
        }
 else {
          proxy=new LockClientProxy(o,this);
        }
      }
    }
  }
  return mapProxies.get(o);
}