Program: 118352
Project: 118352
Buggy source:
@SuppressWarnings("String_Node_Str") @Override public ExecutionResult execute(Item item){
  EList<ContextType> contexts=null;
  if (item instanceof ProcessItem) {
    ProcessItem processItem=(ProcessItem)item;
    contexts=processItem.getProcess().getContext();
  }
 else   if (item instanceof JobletProcessItem) {
    JobletProcessItem jobletItem=(JobletProcessItem)item;
    contexts=jobletItem.getJobletProcess().getContext();
  }
 else   if (item instanceof ContextItem) {
    ContextItem contextItem=(ContextItem)item;
    contexts=contextItem.getContext();
  }
  boolean hasNull=false, isSame=true;
  if (contexts != null && contexts.size() > 1) {
    List<String> firstComments=new ArrayList<String>();
    for (int x=0; x < contexts.size(); x++) {
      List<ContextParameterType> contextParams=contexts.get(x).getContextParameter();
      for (int y=0; y < contextParams.size(); y++) {
        ContextParameterType param=contextParams.get(y);
        boolean isBuiltin=param.getRepositoryContextId() == null;
        String comment=param.getComment();
        if (comment == null) {
          if (isBuiltin) {
            param.setComment("String_Node_Str");
            hasNull=true;
          }
          continue;
        }
        if (x == 0) {
          if (!isBuiltin) {
            firstComments.add("String_Node_Str");
          }
 else {
            firstComments.add(comment);
          }
          continue;
        }
        if (isBuiltin && !comment.equals(firstComments.get(y))) {
          isSame=false;
        }
      }
    }
    try {
      if (hasNull) {
        ProxyRepositoryFactory.getInstance().save(item,true);
        return ExecutionResult.SUCCESS_NO_ALERT;
      }
      if (!isSame) {
        for (int x=1; x < contexts.size(); x++) {
          List<ContextParameterType> contextParams=contexts.get(x).getContextParameter();
          for (int y=0; y < contextParams.size(); y++) {
            ContextParameterType param=contextParams.get(y);
            String comment=param.getComment();
            if (param.getRepositoryContextId() == null && !firstComments.get(y).equals(comment)) {
              if (!firstComments.get(y).equals("String_Node_Str")) {
                param.setComment(firstComments.get(y));
              }
            }
          }
        }
        ProxyRepositoryFactory.getInstance().save(item,true);
        return ExecutionResult.SUCCESS_NO_ALERT;
      }
    }
 catch (    PersistenceException e) {
      ExceptionHandler.process(e);
      return ExecutionResult.FAILURE;
    }
  }
  return ExecutionResult.NOTHING_TO_DO;
}

Fixed version (ground truth):
@SuppressWarnings("String_Node_Str") @Override public ExecutionResult execute(Item item){
  EList<ContextType> contexts=null;
  String defualtGroupName=null;
  if (item instanceof ProcessItem) {
    ProcessItem processItem=(ProcessItem)item;
    contexts=processItem.getProcess().getContext();
    defualtGroupName=processItem.getProcess().getDefaultContext();
  }
 else   if (item instanceof JobletProcessItem) {
    JobletProcessItem jobletItem=(JobletProcessItem)item;
    contexts=jobletItem.getJobletProcess().getContext();
    defualtGroupName=jobletItem.getJobletProcess().getDefaultContext();
  }
 else   if (item instanceof ContextItem) {
    ContextItem contextItem=(ContextItem)item;
    contexts=contextItem.getContext();
    defualtGroupName=contextItem.getDefaultContext();
  }
  try {
    ContextType defaultGroup=null;
    for (    ContextType context : contexts) {
      if (context.getName().equals(defualtGroupName)) {
        defaultGroup=context;
        break;
      }
    }
    if (defaultGroup == null && contexts.size() > 0) {
      defaultGroup=contexts.get(0);
    }
    boolean contextChanged=false;
    if (defaultGroup != null) {
      Map<String,ContextParameterType> paramMap=new HashMap<String,ContextParameterType>();
      List<String> paramNameList=new ArrayList<String>();
      paramMap.putAll(collectDefaultGroupParams(defaultGroup,paramNameList));
      for (      ContextType context : contexts) {
        if (context == defaultGroup) {
          continue;
        }
        Map<String,ContextParameterType> otherGroupParam=collectDefaultGroupParams(context,paramNameList);
        for (        String paramName : otherGroupParam.keySet()) {
          if (!paramMap.containsKey(paramName)) {
            paramMap.put(paramName,otherGroupParam.get(paramName));
          }
        }
      }
      for (      ContextType context : contexts) {
        EList<ContextParameterType> params=context.getContextParameter();
        List<String> paramNames=new ArrayList<String>(paramNameList);
        for (        ContextParameterType param : params) {
          if (paramNames.contains(param.getName())) {
            paramNames.remove(param.getName());
          }
        }
        if (!paramNames.isEmpty()) {
          contextChanged=true;
          for (          String paramToAdd : paramNames) {
            ContextParameterType toAdd=paramMap.get(paramToAdd);
            context.getContextParameter().add(EcoreUtil.copy(toAdd));
          }
        }
      }
      for (      ContextType context : contexts) {
        EList<ContextParameterType> params=context.getContextParameter();
        List<ContextParameterType> copyOfParam=new ArrayList<ContextParameterType>(params);
        for (int i=0; i < copyOfParam.size(); i++) {
          ContextParameterType param=copyOfParam.get(i);
          int indexOf=paramNameList.indexOf(param.getName());
          if (i != indexOf) {
            contextChanged=true;
            params.remove(param);
            params.add(indexOf,param);
          }
        }
      }
      for (      ContextType context : contexts) {
        EList<ContextParameterType> params=context.getContextParameter();
        for (        ContextParameterType param : params) {
          ContextParameterType paramDefault=paramMap.get(param.getName());
          if (!paramDefault.getType().equals(param.getType())) {
            contextChanged=true;
            param.setType(paramDefault.getType());
          }
          if (paramDefault.getComment() == null && param.getComment() != null || (paramDefault.getComment() != null && !paramDefault.getComment().equals(param.getComment()))) {
            contextChanged=true;
            param.setComment(paramDefault.getComment());
          }
          if (paramDefault.getRepositoryContextId() == null && param.getRepositoryContextId() != null || (paramDefault.getRepositoryContextId() != null && !paramDefault.getRepositoryContextId().equals(param.getRepositoryContextId()))) {
            contextChanged=true;
            param.setRepositoryContextId(paramDefault.getRepositoryContextId());
          }
        }
      }
    }
    if (contextChanged) {
      ProxyRepositoryFactory.getInstance().save(item,true);
      return ExecutionResult.SUCCESS_NO_ALERT;
    }
  }
 catch (  PersistenceException e) {
    ExceptionHandler.process(e);
    return ExecutionResult.FAILURE;
  }
  return ExecutionResult.NOTHING_TO_DO;
}