Program: 11160
Project: 11160
Buggy source:
/** 
 * Connect Method: Enabled the connector with his own configuration.
 * @param credentials The credentials.
 * @param config      The cluster config
 * @throws ConnectionException
 */
@Override public void connect(ICredentials credentials,ConnectorClusterConfig config) throws ConnectionException {
  ClusterName clusterName=config.getName();
  if (sessions.containsKey(clusterName.getName())) {
    throw new ConnectionException("String_Node_Str" + clusterName.getName() + "String_Node_Str");
  }
  Map<String,String> clusterOptions=config.getClusterOptions();
  Map<String,String> connectorOptions=config.getConnectorOptions();
  EngineConfig engineConfig=new EngineConfig();
  engineConfig.setCassandraHosts(clusterOptions.get("String_Node_Str").substring(1,clusterOptions.get("String_Node_Str").length() - 1).split("String_Node_Str"));
  engineConfig.setCassandraPort(Integer.parseInt(clusterOptions.get("String_Node_Str")));
  engineConfig.setCredentials(credentials);
  Pair<String,String> connectorPropertiesValues;
  List<Pair<String,String>> connectorPropertiesList=new ArrayList<>();
  if (connectorOptions.get("String_Node_Str") == null) {
    connectorPropertiesValues=new ImmutablePair<>("String_Node_Str",Integer.toString(DEFAULT_LIMIT));
  }
 else {
    connectorPropertiesValues=new ImmutablePair<>("String_Node_Str",connectorOptions.get("String_Node_Str"));
  }
  connectorPropertiesList.add(connectorPropertiesValues);
  connectorOptionsPerCluster.put(clusterName.getName(),connectorPropertiesList);
  Engine engine=new Engine(engineConfig);
  LOG.info("String_Node_Str");
  sessions.put(clusterName.getName(),engine.getSession());
}

Fixed version (ground truth):
/** 
 * Connect Method: Enabled the connector with his own configuration.
 * @param credentials The credentials.
 * @param config      The cluster config
 * @throws ConnectionException
 */
@Override public void connect(ICredentials credentials,ConnectorClusterConfig config) throws ConnectionException {
  ClusterName clusterName=config.getName();
  if (sessions.containsKey(clusterName.getName())) {
    LOG.warn("String_Node_Str" + clusterName.getName() + "String_Node_Str");
    return;
  }
  Map<String,String> clusterOptions=config.getClusterOptions();
  Map<String,String> connectorOptions=config.getConnectorOptions();
  EngineConfig engineConfig=new EngineConfig();
  String[] hosts=clusterOptions.get("String_Node_Str").substring(1,clusterOptions.get("String_Node_Str").length() - 1).split("String_Node_Str");
  String[] trimmedHosts=new String[hosts.length];
  for (int i=0; i < hosts.length; i++) {
    trimmedHosts[i]=hosts[i].trim();
  }
  engineConfig.setCassandraHosts(trimmedHosts);
  engineConfig.setCassandraPort(Integer.parseInt(clusterOptions.get("String_Node_Str")));
  engineConfig.setCredentials(credentials);
  Pair<String,String> connectorPropertiesValues;
  List<Pair<String,String>> connectorPropertiesList=new ArrayList<>();
  if (connectorOptions.get("String_Node_Str") == null) {
    connectorPropertiesValues=new ImmutablePair<>("String_Node_Str",Integer.toString(DEFAULT_LIMIT));
  }
 else {
    connectorPropertiesValues=new ImmutablePair<>("String_Node_Str",connectorOptions.get("String_Node_Str"));
  }
  connectorPropertiesList.add(connectorPropertiesValues);
  connectorOptionsPerCluster.put(clusterName.getName(),connectorPropertiesList);
  Engine engine=new Engine(engineConfig);
  LOG.info("String_Node_Str");
  sessions.put(clusterName.getName(),engine.getSession());
}