Program: 28888
Project: 28888
Buggy source:
/** 
 * Convert the given JSON string to   {@link Event}
 * @param eventObject JSON string
 * @return the constructed Event object
 */
private Object convertToEvent(Object eventObject){
  if (eventObject == null) {
    throw new ExecutionPlanRuntimeException("String_Node_Str");
  }
  if (!(eventObject instanceof String)) {
    throw new ExecutionPlanRuntimeException("String_Node_Str" + eventObject.getClass().getCanonicalName());
  }
  if (!isJsonValid(eventObject.toString())) {
    log.error("String_Node_Str" + eventObject.toString());
    return null;
  }
  Object jsonObj;
  ReadContext readContext=JsonPath.parse(eventObject.toString());
  int index;
  if (isCustomMappingEnabled) {
    jsonObj=readContext.read(enclosingElement);
    if (jsonObj == null) {
      log.error("String_Node_Str" + enclosingElement + "String_Node_Str"+ eventObject.toString()+ "String_Node_Str");
      return null;
    }
    if (jsonObj instanceof JSONArray) {
      JSONArray jsonArray=(JSONArray)jsonObj;
      Event[] newEventArray=new Event[jsonArray.size()];
      List<Event> eventList=new ArrayList<Event>();
      index=0;
      for (      Object eventObj : jsonArray) {
        try {
          Event event=processCustomEvent(JsonPath.parse(eventObj));
          if (failOnMissingAttribute && checkForUnknownAttributes(event)) {
            log.error("String_Node_Str" + event.toString() + "String_Node_Str");
          }
 else {
            eventList.add(event);
          }
        }
 catch (        ExecutionPlanRuntimeException e) {
          log.error(e.getMessage());
        }
      }
      Event[] eventArray=new Event[eventList.size()];
      eventArray=eventList.toArray(eventArray);
      return eventArray;
    }
 else {
      try {
        Event event=processCustomEvent(JsonPath.parse(jsonObj));
        if (failOnMissingAttribute && checkForUnknownAttributes(event)) {
          log.error("String_Node_Str" + event.toString() + "String_Node_Str");
          return null;
        }
        return event;
      }
 catch (      ExecutionPlanRuntimeException e) {
        log.error(e.getMessage());
        return null;
      }
    }
  }
 else {
    jsonObj=readContext.read(DEFAULT_ENCLOSING_ELEMENT);
    if (jsonObj instanceof JSONArray) {
      return convertToEventArrayForDefaultMapping(eventObject);
    }
 else {
      try {
        Event event=convertToSingleEventForDefaultMapping(eventObject);
        if (event == null) {
          log.error("String_Node_Str" + eventObject + "String_Node_Str");
          return null;
        }
        if (failOnMissingAttribute && checkForUnknownAttributes(event)) {
          log.error("String_Node_Str" + event.toString() + "String_Node_Str");
          return null;
        }
        return event;
      }
 catch (      IOException e) {
        log.error("String_Node_Str" + eventObject.toString() + "String_Node_Str");
        return null;
      }
catch (      ExecutionPlanRuntimeException e) {
        log.error(e.getMessage());
        return null;
      }
    }
  }
}

Fixed version (ground truth):
/** 
 * Convert the given JSON string to   {@link Event}.
 * @param eventObject JSON string
 * @return the constructed Event object
 */
private Object convertToEvent(Object eventObject){
  if (eventObject == null) {
    throw new ExecutionPlanRuntimeException("String_Node_Str");
  }
  if (!(eventObject instanceof String)) {
    throw new ExecutionPlanRuntimeException("String_Node_Str" + eventObject.getClass().getCanonicalName());
  }
  if (!isJsonValid(eventObject.toString())) {
    log.error("String_Node_Str" + eventObject.toString());
    return null;
  }
  Object jsonObj;
  ReadContext readContext=JsonPath.parse(eventObject.toString());
  int index;
  if (isCustomMappingEnabled) {
    jsonObj=readContext.read(enclosingElement);
    if (jsonObj == null) {
      log.error("String_Node_Str" + enclosingElement + "String_Node_Str"+ eventObject.toString()+ "String_Node_Str");
      return null;
    }
    if (jsonObj instanceof JSONArray) {
      JSONArray jsonArray=(JSONArray)jsonObj;
      List<Event> eventList=new ArrayList<Event>();
      for (      Object eventObj : jsonArray) {
        try {
          Event event=processCustomEvent(JsonPath.parse(eventObj));
          if (failOnMissingAttribute && checkForUnknownAttributes(event)) {
            log.error("String_Node_Str" + event.toString() + "String_Node_Str");
          }
 else {
            eventList.add(event);
          }
        }
 catch (        ExecutionPlanRuntimeException e) {
          log.error(e.getMessage());
        }
      }
      Event[] eventArray=new Event[eventList.size()];
      eventArray=eventList.toArray(eventArray);
      return eventArray;
    }
 else {
      try {
        Event event=processCustomEvent(JsonPath.parse(jsonObj));
        if (failOnMissingAttribute && checkForUnknownAttributes(event)) {
          log.error("String_Node_Str" + event.toString() + "String_Node_Str");
          return null;
        }
        return event;
      }
 catch (      ExecutionPlanRuntimeException e) {
        log.error(e.getMessage());
        return null;
      }
    }
  }
 else {
    jsonObj=readContext.read(DEFAULT_ENCLOSING_ELEMENT);
    if (jsonObj instanceof JSONArray) {
      return convertToEventArrayForDefaultMapping(eventObject);
    }
 else {
      try {
        Event event=convertToSingleEventForDefaultMapping(eventObject);
        if (event == null) {
          log.error("String_Node_Str" + eventObject + "String_Node_Str");
          return null;
        }
        if (failOnMissingAttribute && checkForUnknownAttributes(event)) {
          log.error("String_Node_Str" + event.toString() + "String_Node_Str");
          return null;
        }
        return event;
      }
 catch (      IOException e) {
        log.error("String_Node_Str" + eventObject.toString() + "String_Node_Str");
        return null;
      }
catch (      ExecutionPlanRuntimeException e) {
        log.error(e.getMessage());
        return null;
      }
    }
  }
}