Program: 21692
Project: 21692
Buggy source:
/** 
 * Tries to create a <code>LoggingDeviceProxy</code> for the the serial port specified by the given <code>serialPortName</code>. Returns <code>null</code> if the connection could not be established.
 * @param serialPortName - the name of the serial port device which should be used to establish the connection
 * @throws IllegalArgumentException if the <code>serialPortName</code> is <code>null</code>
 */
@Nullable static LoggingDeviceProxy create(@Nullable final String serialPortName){
  if (serialPortName == null) {
    throw new IllegalArgumentException("String_Node_Str");
  }
  final SerialIOConfiguration config=new SerialIOConfiguration(serialPortName,BaudRate.BAUD_460800,CharacterSize.EIGHT,Parity.NONE,StopBits.ONE,FlowControl.HARDWARE);
  try {
    final SerialDeviceCommandExecutionQueue commandQueue=SerialDeviceCommandExecutionQueue.create(APPLICATION_NAME,config,-1,null);
    if (commandQueue == null) {
      if (LOG.isEnabledFor(Level.ERROR)) {
        LOG.error("String_Node_Str" + serialPortName + "String_Node_Str");
      }
    }
 else {
      if (LOG.isDebugEnabled()) {
        LOG.debug("String_Node_Str" + serialPortName + "String_Node_Str");
      }
      final boolean wasHandshakeSuccessful=commandQueue.executeAndReturnStatus(new HandshakeCommandStrategy());
      if (wasHandshakeSuccessful) {
        LOG.info("String_Node_Str");
        return new LoggingDeviceProxy(commandQueue,serialPortName);
      }
 else {
        LOG.error("String_Node_Str");
      }
      commandQueue.shutdown();
    }
  }
 catch (  Exception e) {
    LOG.error("String_Node_Str",e);
  }
  return null;
}

Fixed version (ground truth):
/** 
 * Tries to create a <code>LoggingDeviceProxy</code> for the the serial port specified by the given <code>serialPortName</code>. Returns <code>null</code> if the connection could not be established.
 * @param serialPortName - the name of the serial port device which should be used to establish the connection
 * @throws IllegalArgumentException if the <code>serialPortName</code> is <code>null</code>
 */
@Nullable static LoggingDeviceProxy create(@Nullable final String serialPortName){
  if (serialPortName == null) {
    throw new IllegalArgumentException("String_Node_Str");
  }
  final SerialIOConfiguration config=new SerialIOConfiguration(serialPortName,BaudRate.BAUD_460800,CharacterSize.EIGHT,Parity.NONE,StopBits.ONE,FlowControl.HARDWARE);
  try {
    final SerialDeviceCommandExecutionQueue commandQueue=SerialDeviceCommandExecutionQueue.create(APPLICATION_NAME,config,-1,null);
    if (commandQueue == null) {
      if (LOG.isEnabledFor(Level.ERROR)) {
        LOG.error("String_Node_Str" + serialPortName + "String_Node_Str");
      }
    }
 else {
      if (LOG.isDebugEnabled()) {
        LOG.debug("String_Node_Str" + serialPortName + "String_Node_Str");
      }
      final boolean wasHandshakeSuccessful=commandQueue.executeAndReturnStatus(new HandshakeCommandStrategy());
      if (wasHandshakeSuccessful) {
        LOG.info("String_Node_Str");
        try {
          return new LoggingDeviceProxy(commandQueue,serialPortName);
        }
 catch (        InitializationException e) {
          LOG.error("String_Node_Str",e);
          CONSOLE_LOG.error("String_Node_Str");
        }
catch (        Exception e) {
          LOG.error("String_Node_Str",e);
        }
      }
 else {
        LOG.error("String_Node_Str");
      }
      commandQueue.shutdown();
    }
  }
 catch (  Exception e) {
    LOG.error("String_Node_Str",e);
  }
  CONSOLE_LOG.error("String_Node_Str");
  return null;
}