Program: 5921
Project: 5921
Buggy source:
protected final boolean connect(){
synchronized (this) {
    if (this.connection != null)     throw (new IllegalStateException("String_Node_Str"));
    this.shouldReconnect=true;
    final ConnectionFactory connectionFactory=new ConnectionFactory();
    connectionFactory.setHost(this.host);
    connectionFactory.setPort(this.port);
    connectionFactory.setVirtualHost(this.virtualHost);
    connectionFactory.setUsername(this.username);
    connectionFactory.setPassword(this.password);
    try {
      this.connection=connectionFactory.newConnection();
    }
 catch (    final Throwable exception) {
      this.connection=null;
      this.exceptionHandler.handleException("String_Node_Str",exception);
    }
    if (this.connection != null)     try {
      this.channel=this.connection.createChannel();
    }
 catch (    final Throwable exception) {
      this.channel=null;
      this.exceptionHandler.handleException("String_Node_Str",exception);
    }
    if ((this.connection == null) || (this.channel == null)) {
      if (this.connection != null)       this.disconnect();
    }
    if (this.connection != null) {
      this.connection.addShutdownListener(new ShutdownListener(){
        public void shutdownCompleted(        final ShutdownSignalException exception){
          AmqpAccessor.this.shouldReconnect=true;
          if (!exception.isInitiatedByApplication())           AmqpAccessor.this.exceptionHandler.handleException("String_Node_Str",exception);
        }
      }
);
      this.shouldReconnect=false;
    }
    return (this.connection != null);
  }
}

Fixed version (ground truth):
protected final boolean connect(){
synchronized (this) {
    if (this.connection != null)     throw (new IllegalStateException("String_Node_Str"));
    this.callbacks.handleLogEvent(Level.INFO,null,"String_Node_Str",this.username,this.host,this.port,this.virtualHost);
    this.shouldReconnect=true;
    final ConnectionFactory connectionFactory=new ConnectionFactory();
    connectionFactory.setHost(this.host);
    connectionFactory.setPort(this.port);
    connectionFactory.setVirtualHost(this.virtualHost);
    connectionFactory.setUsername(this.username);
    connectionFactory.setPassword(this.password);
    try {
      this.connection=connectionFactory.newConnection();
    }
 catch (    final Throwable exception) {
      this.connection=null;
      this.callbacks.handleException(exception,"String_Node_Str");
    }
    if (this.connection != null)     try {
      this.channel=this.connection.createChannel();
    }
 catch (    final Throwable exception) {
      this.channel=null;
      this.callbacks.handleException(exception,"String_Node_Str");
    }
    if ((this.connection == null) || (this.channel == null)) {
      if (this.connection != null)       this.disconnect();
    }
    if (this.connection != null) {
      this.connection.addShutdownListener(new ShutdownListener(){
        public void shutdownCompleted(        final ShutdownSignalException exception){
          AmqpAccessor.this.shouldReconnect=true;
          if (!exception.isInitiatedByApplication()) {
            AmqpAccessor.this.callbacks.handleException(exception,"String_Node_Str");
            AmqpAccessor.this.disconnect();
          }
        }
      }
);
      this.shouldReconnect=false;
      this.callbacks.handleLogEvent(Level.INFO,null,"String_Node_Str");
    }
    return (this.connection != null);
  }
}