Program: 117894
Project: 117894
Buggy source:
public static boolean canConnectToTarget(INode source,INode oldTarget,INode newTarget,EConnectionType lineStyle,String connectorName,String connectionName,boolean refactorJoblet){
  newlineStyle=lineStyle;
  if (source.equals(newTarget)) {
    return false;
  }
  if (PluginChecker.isJobLetPluginLoaded()) {
    IJobletProviderService service=(IJobletProviderService)GlobalServiceRegister.getDefault().getService(IJobletProviderService.class);
    if (service != null) {
      if (service.isTriggerNode(newTarget) && !service.canConnectTriggerNode(newTarget,lineStyle)) {
        return false;
      }
      if (service.isJobletComponent(source.getJobletNode())) {
        return false;
      }
    }
  }
  INode processStartNode=source.getProcessStartNode(true);
  if (processStartNode.equals(newTarget)) {
    return false;
  }
  if (newTarget.isELTComponent() && newTarget.getComponent().getName().endsWith("String_Node_Str")) {
    String targetName=newTarget.getComponent().getOriginalFamilyName();
    String sourceName=processStartNode.getComponent().getOriginalFamilyName();
    if (!targetName.equals(sourceName) && !(lineStyle.hasConnectionCategory(IConnectionCategory.DEPENDENCY))) {
      return false;
    }
  }
  if (checkCircle(source,newTarget)) {
    return false;
  }
  if (newTarget.isFileScaleComponent()) {
    if (newlineStyle.hasConnectionCategory(IConnectionCategory.FLOW) && !connectorName.equals("String_Node_Str")) {
      return false;
    }
  }
  if (newlineStyle.hasConnectionCategory(IConnectionCategory.FLOW)) {
    newlineStyle=EConnectionType.FLOW_MAIN;
    if (newTarget.getComponent().useLookup()) {
      int nbMain=0;
      for (      IConnection connec : newTarget.getIncomingConnections()) {
        if (connec.getLineStyle().equals(EConnectionType.FLOW_MAIN)) {
          nbMain++;
        }
      }
      if (nbMain >= 1) {
        newlineStyle=EConnectionType.FLOW_REF;
      }
 else {
        newlineStyle=EConnectionType.FLOW_MAIN;
      }
    }
 else     if (newTarget.getComponent().useMerge()) {
      newlineStyle=EConnectionType.FLOW_MERGE;
    }
  }
  boolean isJoblet=false;
  if (PluginChecker.isJobLetPluginLoaded()) {
    IJobletProviderService service=(IJobletProviderService)GlobalServiceRegister.getDefault().getService(IJobletProviderService.class);
    if (service != null && service.isJobletComponent(newTarget) && !lineStyle.hasConnectionCategory(IConnectionCategory.FLOW)) {
      List<INodeConnector> inputConnector=service.getFreeTriggerBuiltConnectors(newTarget,lineStyle,true);
      if (inputConnector.isEmpty()) {
        return false;
      }
      isJoblet=true;
    }
  }
  if (!isJoblet) {
    INodeConnector connectorFromType=newTarget.getConnectorFromType(newlineStyle);
    if (connectorFromType == null) {
      return false;
    }
    int maxInput=connectorFromType.getMaxLinkInput();
    if (maxInput != -1 && (connectorFromType.getCurLinkNbInput() >= maxInput)) {
      return false;
    }
  }
  if (!canConnect(source,newTarget,lineStyle,connectionName,refactorJoblet)) {
    return false;
  }
  return true;
}

Fixed version (ground truth):
public static boolean canConnectToTarget(INode source,INode oldTarget,INode newTarget,EConnectionType lineStyle,String connectorName,String connectionName,boolean refactorJoblet){
  newlineStyle=lineStyle;
  if (source.equals(newTarget)) {
    return false;
  }
  if (PluginChecker.isJobLetPluginLoaded()) {
    IJobletProviderService service=(IJobletProviderService)GlobalServiceRegister.getDefault().getService(IJobletProviderService.class);
    if (service != null) {
      if (service.isTriggerNode(newTarget) && !service.canConnectTriggerNode(newTarget,lineStyle)) {
        return false;
      }
      if (service.isJobletComponent(source.getJobletNode())) {
        return false;
      }
    }
  }
  INode processStartNode=source.getProcessStartNode(true);
  if (processStartNode.equals(newTarget)) {
    return false;
  }
  if (newTarget.isELTComponent() && newTarget.getComponent().getName().endsWith("String_Node_Str")) {
    String targetName=newTarget.getComponent().getOriginalFamilyName();
    String sourceName=processStartNode.getComponent().getOriginalFamilyName();
    if (!targetName.equals(sourceName) && !(lineStyle.hasConnectionCategory(IConnectionCategory.DEPENDENCY))) {
      return false;
    }
  }
  if (checkCircle(source,newTarget)) {
    return false;
  }
  if (newTarget.isFileScaleComponent()) {
    if (newlineStyle.hasConnectionCategory(IConnectionCategory.FLOW) && !connectorName.equals("String_Node_Str")) {
      return false;
    }
  }
  if (newlineStyle.hasConnectionCategory(IConnectionCategory.FLOW)) {
    newlineStyle=EConnectionType.FLOW_MAIN;
    if (newTarget.getComponent().useLookup()) {
      int nbMain=0;
      for (      IConnection connec : newTarget.getIncomingConnections()) {
        if (connec.getLineStyle().equals(EConnectionType.FLOW_MAIN)) {
          nbMain++;
        }
      }
      if (nbMain >= 1) {
        newlineStyle=EConnectionType.FLOW_REF;
      }
 else {
        newlineStyle=EConnectionType.FLOW_MAIN;
      }
    }
 else     if (newTarget.getComponent().useMerge()) {
      newlineStyle=EConnectionType.FLOW_MERGE;
    }
  }
  boolean isJoblet=false;
  if (PluginChecker.isJobLetPluginLoaded()) {
    IJobletProviderService service=(IJobletProviderService)GlobalServiceRegister.getDefault().getService(IJobletProviderService.class);
    if (service != null && service.isJobletComponent(newTarget) && !lineStyle.hasConnectionCategory(IConnectionCategory.FLOW)) {
      List<INodeConnector> inputConnector=service.getFreeTriggerBuiltConnectors(newTarget,lineStyle,true);
      if (inputConnector.isEmpty()) {
        return false;
      }
      isJoblet=true;
    }
  }
  if (!isJoblet) {
    INodeConnector connectorFromType=newTarget.getConnectorFromType(newlineStyle);
    if (connectorFromType == null || !connectorFromType.isShow()) {
      return false;
    }
    int maxInput=connectorFromType.getMaxLinkInput();
    if (maxInput != -1 && (connectorFromType.getCurLinkNbInput() >= maxInput)) {
      return false;
    }
  }
  if (!canConnect(source,newTarget,lineStyle,connectionName,refactorJoblet)) {
    return false;
  }
  return true;
}