Program: 50049
Project: 50049
Buggy source:
public void connect() throws TransportException, NetconfProtocolException {
  TimerKeepAlive timerKeepAlive;
  RPCElement reply;
  Hello clientHello;
  Hello serverHello;
  ArrayList<Capability> activeCapabilities;
  ArrayList<Capability> clientCapabilities;
  ArrayList<Capability> serverCapabilities;
  messageQueue=new MessageQueue();
  messageQueue.addListener(this);
  try {
    transport=TransportFactory.getTransport(sessionContext.getURI().getScheme());
  }
 catch (  TransportNotImplementedException e) {
    TransportException te=new TransportException(e.getMessage());
    te.initCause(e);
    throw te;
  }
  transport.setMessageQueue(messageQueue);
  transport.addListener(this);
  sessionContext.setLastMessageId(0);
  transport.connect(sessionContext);
  log.info("String_Node_Str");
  clientHello=new Hello();
  clientCapabilities=Capability.getSupportedCapabilities();
  clientHello.setCapabilities(clientCapabilities);
  log.info("String_Node_Str");
  transport.sendAsyncQuery(clientHello);
  reply=messageQueue.blockingConsumeById("String_Node_Str");
  if (!(reply instanceof Hello))   throw new NetconfProtocolException("String_Node_Str");
 else   serverHello=(Hello)reply;
  log.info("String_Node_Str");
  this.sessionId=serverHello.getSessionId();
  serverCapabilities=serverHello.getCapabilities();
  activeCapabilities=(ArrayList<Capability>)clientCapabilities.clone();
  activeCapabilities.retainAll(serverCapabilities);
  log.debug("String_Node_Str" + activeCapabilities);
  sessionContext.setActiveCapabilities(activeCapabilities);
  sessionContext.setClientCapabilities(clientCapabilities);
  sessionContext.setServerCapabilities(serverCapabilities);
  log.info("String_Node_Str" + this.sessionId + "String_Node_Str");
  for (  Capability capability : activeCapabilities)   log.info("String_Node_Str" + capability);
  timerKeepAlive=new TimerKeepAlive(this);
  timerKeepAlive.start(PERIOD);
}

Fixed version (ground truth):
public void connect() throws TransportException, NetconfProtocolException {
  RPCElement reply;
  Hello clientHello;
  Hello serverHello;
  ArrayList<Capability> activeCapabilities;
  ArrayList<Capability> clientCapabilities;
  ArrayList<Capability> serverCapabilities;
  messageQueue=new MessageQueue();
  messageQueue.addListener(this);
  try {
    transport=TransportFactory.getTransport(sessionContext.getURI().getScheme());
  }
 catch (  TransportNotImplementedException e) {
    TransportException te=new TransportException(e.getMessage());
    te.initCause(e);
    throw te;
  }
  transport.setMessageQueue(messageQueue);
  transport.addListener(this);
  sessionContext.setLastMessageId(0);
  transport.connect(sessionContext);
  log.info("String_Node_Str");
  clientHello=new Hello();
  clientCapabilities=Capability.getSupportedCapabilities();
  clientHello.setCapabilities(clientCapabilities);
  log.info("String_Node_Str");
  transport.sendAsyncQuery(clientHello);
  reply=messageQueue.blockingConsumeById("String_Node_Str");
  if (!(reply instanceof Hello))   throw new NetconfProtocolException("String_Node_Str");
 else   serverHello=(Hello)reply;
  log.info("String_Node_Str");
  this.sessionId=serverHello.getSessionId();
  serverCapabilities=serverHello.getCapabilities();
  activeCapabilities=(ArrayList<Capability>)clientCapabilities.clone();
  activeCapabilities.retainAll(serverCapabilities);
  log.debug("String_Node_Str" + activeCapabilities);
  sessionContext.setActiveCapabilities(activeCapabilities);
  sessionContext.setClientCapabilities(clientCapabilities);
  sessionContext.setServerCapabilities(serverCapabilities);
  log.info("String_Node_Str" + this.sessionId + "String_Node_Str");
  for (  Capability capability : activeCapabilities)   log.info("String_Node_Str" + capability);
  timerKeepAlive=new TimerKeepAlive(this);
  timerKeepAlive.start(PERIOD);
}