Program: 123439
Project: 123439
Buggy source:
/** 
 * DOC hcyi Comment method "checkHasMultiPrejobOrPostJobComponents".
 */
private void checkHasMultiPrejobOrPostJobComponents(){
  if (PluginChecker.isJobLetPluginLoaded()) {
    IJobletProviderService jobletService=(IJobletProviderService)GlobalServiceRegister.getDefault().getService(IJobletProviderService.class);
    if (jobletService != null) {
      if (jobletService.isJobletComponent(this)) {
        Map<String,List<INode>> multiNodes=new HashMap<String,List<INode>>();
        jobletService.getMultiPrejobOrPostjobNodes(this,multiNodes);
        if (multiNodes.containsKey(TPREJOB_STR)) {
          List<INode> nodes=multiNodes.get(TPREJOB_STR);
          if (nodes.size() > 1) {
            String errorMessage=Messages.getString("String_Node_Str",TPREJOB_STR);
            Problems.add(ProblemStatus.ERROR,this,errorMessage);
          }
 else           if (nodes.size() == 1) {
            for (            INode node : process.getGraphicalNodes()) {
              String componentName=node.getComponent().getName();
              if (componentName != null && componentName.equals(TPREJOB_STR)) {
                String errorMessage=Messages.getString("String_Node_Str",TPREJOB_STR);
                Problems.add(ProblemStatus.ERROR,this,errorMessage);
              }
            }
          }
        }
        if (multiNodes.containsKey(TPOSTJOB_STR)) {
          List<INode> nodes=multiNodes.get(TPOSTJOB_STR);
          if (nodes.size() > 1) {
            String errorMessage=Messages.getString("String_Node_Str",TPOSTJOB_STR);
            Problems.add(ProblemStatus.ERROR,this,errorMessage);
          }
 else           if (nodes.size() == 1) {
            for (            INode node : process.getGraphicalNodes()) {
              String componentName=node.getComponent().getName();
              if (componentName != null && componentName.equals(TPOSTJOB_STR)) {
                String errorMessage=Messages.getString("String_Node_Str",TPOSTJOB_STR);
                Problems.add(ProblemStatus.ERROR,this,errorMessage);
              }
            }
          }
        }
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * DOC hcyi Comment method "checkHasMultiPrejobOrPostJobComponents".
 */
private void checkHasMultiPrejobOrPostJobComponents(){
  if (PluginChecker.isJobLetPluginLoaded()) {
    IJobletProviderService jobletService=(IJobletProviderService)GlobalServiceRegister.getDefault().getService(IJobletProviderService.class);
    if (jobletService != null) {
      if (jobletService.isJobletComponent(this)) {
        Map<String,INode> multiNodes=new HashMap<String,INode>();
        for (        INode node : process.getGeneratingNodes()) {
          String componentName=node.getComponent().getName();
          if (componentName != null && componentName.equals(TPREJOB_STR)) {
            if (!multiNodes.containsKey(TPREJOB_STR)) {
              multiNodes.put(TPREJOB_STR,node);
            }
 else {
              String errorMessage=Messages.getString("String_Node_Str",TPREJOB_STR);
              Problems.add(ProblemStatus.ERROR,this,errorMessage);
            }
          }
          if (componentName != null && componentName.equals(TPOSTJOB_STR)) {
            if (!multiNodes.containsKey(TPOSTJOB_STR)) {
              multiNodes.put(TPOSTJOB_STR,node);
            }
 else {
              String errorMessage=Messages.getString("String_Node_Str",TPOSTJOB_STR);
              Problems.add(ProblemStatus.ERROR,this,errorMessage);
            }
          }
        }
      }
    }
  }
}