Program: 82489
Project: 82489
Buggy source:
@Override public void run(){
  while (true) {
    this.latch=new CountDownLatch(1);
    if (this.zookeeper == null) {
      try {
        this.zookeeper=new ZooKeeper(this.url,3000,new Watcher(){
          @Override public void process(          WatchedEvent event){
            KeeperState state=event.getState();
            if (state == KeeperState.Disconnected || state == KeeperState.Expired) {
              log.warn("String_Node_Str" + name + "String_Node_Str");
              closeZookeeper();
            }
 else             if (state == KeeperState.SyncConnected) {
              latch.countDown();
              log.info("String_Node_Str" + name + "String_Node_Str");
            }
          }
        }
);
      }
 catch (      IOException e) {
        log.error("String_Node_Str" + this.name + "String_Node_Str");
        closeZookeeper();
        try {
          Thread.sleep(30000);
          continue;
        }
 catch (        InterruptedException ex) {
          log.info("String_Node_Str" + this.name + "String_Node_Str");
          return;
        }
      }
    }
    try {
      if (latch.await(10,TimeUnit.SECONDS)) {
        this.database.setZookeeperOnline(this.id);
        new Thread(new ControllerCollector(this.id,this.zookeeper,this.database)).start();
        new Thread(new ClusterCollector(this.id,this.zookeeper,this.database)).start();
      }
 else {
        closeZookeeper();
      }
    }
 catch (    InterruptedException e) {
      closeZookeeper();
    }
    try {
      Thread.sleep(Agent.COLLECTOR_SLEEP_TIME);
    }
 catch (    InterruptedException e) {
      log.info("String_Node_Str" + this.name + "String_Node_Str");
      return;
    }
  }
}

Fixed version (ground truth):
@Override public void run(){
  while (true) {
    try {
      this.latch=new CountDownLatch(1);
      if (this.zookeeper != null) {
        try {
          this.zookeeper.close();
        }
 catch (        InterruptedException e) {
        }
      }
      this.zookeeper=new ZooKeeper(this.url,3000,new Watcher(){
        @Override public void process(        WatchedEvent event){
          KeeperState state=event.getState();
          if (state == KeeperState.Disconnected || state == KeeperState.Expired) {
            log.warn("String_Node_Str" + name + "String_Node_Str");
            closeZookeeper();
          }
 else           if (state == KeeperState.SyncConnected) {
            latch.countDown();
            log.info("String_Node_Str" + name + "String_Node_Str");
          }
        }
      }
);
    }
 catch (    IOException e) {
      log.error("String_Node_Str" + this.name + "String_Node_Str");
      closeZookeeper();
      try {
        Thread.sleep(30000);
        continue;
      }
 catch (      InterruptedException ex) {
        log.info("String_Node_Str" + this.name + "String_Node_Str");
        return;
      }
    }
    try {
      if (latch.await(10,TimeUnit.SECONDS)) {
        this.database.setZookeeperOnline(this.id);
        Thread controllerThread=new Thread(new ControllerCollector(this.id,this.zookeeper,this.database));
        Thread clusterThread=new Thread(new ClusterCollector(this.id,this.zookeeper,this.database));
        controllerThread.start();
        clusterThread.start();
        controllerThread.join();
        clusterThread.join();
      }
 else {
        closeZookeeper();
      }
    }
 catch (    InterruptedException e) {
      closeZookeeper();
    }
    try {
      Thread.sleep(Agent.COLLECTOR_SLEEP_TIME);
    }
 catch (    InterruptedException e) {
      log.info("String_Node_Str" + this.name + "String_Node_Str");
      return;
    }
  }
}