Program: 124254
Project: 124254
Buggy source:
@Override public ExecutionResult execute(Item item){
  byte[] screenshotStream=null;
  EList nodeList=null;
  try {
    if (item instanceof ProcessItem) {
      ProcessItem process=(ProcessItem)item;
      screenshotStream=process.getProcess().getScreenshot();
      process.getProcess().getScreenshots().put("String_Node_Str",screenshotStream);
      nodeList=process.getProcess().getNode();
      for (int i=0; i < nodeList.size(); i++) {
        String nodeName;
        NodeType node=(NodeType)nodeList.get(i);
        if (node.getScreenshot() != null && node.getScreenshot().length > 0) {
          EList params=node.getElementParameter();
          for (int j=0; j < params.size(); j++) {
            ElementParameterType type=(ElementParameterType)params.get(j);
            if ("String_Node_Str".equals(type.getName())) {
              nodeName=type.getValue();
              process.getProcess().getScreenshots().put(nodeName,node.getScreenshot());
              break;
            }
          }
          node.setScreenshot(null);
        }
      }
      process.getProcess().setScreenshot(null);
    }
 else     if (item instanceof JobletProcessItem) {
      JobletProcessItem joblet=(JobletProcessItem)item;
      screenshotStream=((JobletProcessItem)item).getJobletProcess().getScreenshot();
      joblet.getJobletProcess().getScreenshots().put("String_Node_Str",screenshotStream);
      nodeList=joblet.getJobletProcess().getNode();
      for (int i=0; i < nodeList.size(); i++) {
        String nodeName;
        NodeType node=(NodeType)nodeList.get(i);
        if (node.getScreenshot() != null && node.getScreenshot().length > 0) {
          EList params=node.getElementParameter();
          for (int j=0; j < params.size(); j++) {
            ElementParameterType type=(ElementParameterType)params.get(j);
            if ("String_Node_Str".equals(type.getName())) {
              nodeName=type.getValue();
              joblet.getJobletProcess().getScreenshots().put(nodeName,node.getScreenshot());
              break;
            }
          }
          node.setScreenshot(null);
        }
      }
      joblet.getJobletProcess().setScreenshot(null);
    }
    ProxyRepositoryFactory.getInstance().save(item,true);
  }
 catch (  PersistenceException e) {
    ExceptionHandler.process(e);
    return ExecutionResult.FAILURE;
  }
  return ExecutionResult.NOTHING_TO_DO;
}

Fixed version (ground truth):
@Override public ExecutionResult execute(Item item){
  byte[] screenshotStream=null;
  EList nodeList=null;
  try {
    if (item instanceof ProcessItem) {
      ProcessItem process=(ProcessItem)item;
      screenshotStream=process.getProcess().getScreenshot();
      process.getProcess().getScreenshots().put("String_Node_Str",screenshotStream);
      nodeList=process.getProcess().getNode();
      for (int i=0; i < nodeList.size(); i++) {
        String nodeName;
        NodeType node=(NodeType)nodeList.get(i);
        if (node.getScreenshot() != null && node.getScreenshot().length > 0) {
          EList params=node.getElementParameter();
          for (int j=0; j < params.size(); j++) {
            ElementParameterType type=(ElementParameterType)params.get(j);
            if ("String_Node_Str".equals(type.getName())) {
              nodeName=type.getValue();
              process.getProcess().getScreenshots().put(nodeName,node.getScreenshot());
              break;
            }
          }
          node.setScreenshot(null);
        }
      }
      process.getProcess().setScreenshot(null);
    }
 else     if (item instanceof JobletProcessItem) {
      JobletProcessItem joblet=(JobletProcessItem)item;
      screenshotStream=((JobletProcessItem)item).getJobletProcess().getScreenshot();
      joblet.getJobletProcess().getScreenshots().put("String_Node_Str",screenshotStream);
      nodeList=joblet.getJobletProcess().getNode();
      for (int i=0; i < nodeList.size(); i++) {
        String nodeName;
        NodeType node=(NodeType)nodeList.get(i);
        if (node.getScreenshot() != null && node.getScreenshot().length > 0) {
          EList params=node.getElementParameter();
          for (int j=0; j < params.size(); j++) {
            ElementParameterType type=(ElementParameterType)params.get(j);
            if ("String_Node_Str".equals(type.getName())) {
              nodeName=type.getValue();
              joblet.getJobletProcess().getScreenshots().put(nodeName,node.getScreenshot());
              break;
            }
          }
          node.setScreenshot(null);
        }
      }
      joblet.getJobletProcess().setScreenshot(null);
    }
    ProxyRepositoryFactory.getInstance().save(item,true);
  }
 catch (  PersistenceException e) {
    ExceptionHandler.process(e);
    return ExecutionResult.FAILURE;
  }
  return ExecutionResult.SUCCESS_NO_ALERT;
}