Program: 93648
Project: 93648
Buggy source:
public String getRelationshipLink(RequestContext context,String dbName,String collName,DBObject data) throws IllegalArgumentException {
  Object _referenceValue=data.get(referenceField);
  String reference;
  if (role == ROLE.OWNING && _referenceValue != null) {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.MANY_TO_ONE) {
      if (!(_referenceValue instanceof String))       throw new IllegalArgumentException("String_Node_Str" + dbName + "String_Node_Str"+ collName+ "String_Node_Str"+ data.get("String_Node_Str")+ "String_Node_Str"+ type.name()+ "String_Node_Str"+ this.referenceField+ "String_Node_Str"+ _referenceValue);
      reference=(String)_referenceValue;
    }
 else {
      if (!(_referenceValue instanceof BasicDBList))       throw new IllegalArgumentException("String_Node_Str" + dbName + "String_Node_Str"+ collName+ "String_Node_Str"+ data.get("String_Node_Str")+ "String_Node_Str"+ type.name()+ "String_Node_Str"+ this.referenceField+ "String_Node_Str"+ _referenceValue);
      String[] ids=((BasicDBList)_referenceValue).toArray(new String[0]);
      for (int idx=ids.length - 1; idx >= 0; idx--) {
        ids[idx]="String_Node_Str" + ids[idx] + "String_Node_Str";
      }
      reference=Arrays.toString(ids);
    }
  }
 else {
    reference="String_Node_Str" + data.get("String_Node_Str").toString() + "String_Node_Str";
  }
  String db=(targetDb == null ? dbName : targetDb);
  if (role == ROLE.OWNING) {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.MANY_TO_ONE) {
      return URLUtilis.getUriWithDocId(context,db,targetCollection,reference);
    }
 else     if (type == TYPE.ONE_TO_MANY || type == TYPE.MANY_TO_MANY) {
      return URLUtilis.getUriWithFilterMany(context,db,targetCollection,referenceField,reference);
    }
  }
 else {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.ONE_TO_MANY) {
      return URLUtilis.getUriWithFilterOne(context,db,targetCollection,referenceField,reference);
    }
 else     if (type == TYPE.MANY_TO_ONE || type == TYPE.MANY_TO_MANY) {
      return URLUtilis.getUriWithFilterManyInverse(context,db,targetCollection,referenceField,reference);
    }
  }
  logger.debug("String_Node_Str",this,data);
  return null;
}

Fixed version (ground truth):
public String getRelationshipLink(RequestContext context,String dbName,String collName,DBObject data) throws IllegalArgumentException {
  Object _referenceValue=data.get(referenceField);
  String reference;
  if (role == ROLE.OWNING) {
    if (_referenceValue == null) {
      return null;
    }
    if (type == TYPE.ONE_TO_ONE || type == TYPE.MANY_TO_ONE) {
      if (!(_referenceValue instanceof String))       throw new IllegalArgumentException("String_Node_Str" + dbName + "String_Node_Str"+ collName+ "String_Node_Str"+ data.get("String_Node_Str")+ "String_Node_Str"+ type.name()+ "String_Node_Str"+ this.referenceField+ "String_Node_Str"+ _referenceValue);
      reference=(String)_referenceValue;
    }
 else {
      if (!(_referenceValue instanceof BasicDBList))       throw new IllegalArgumentException("String_Node_Str" + dbName + "String_Node_Str"+ collName+ "String_Node_Str"+ data.get("String_Node_Str")+ "String_Node_Str"+ type.name()+ "String_Node_Str"+ this.referenceField+ "String_Node_Str"+ _referenceValue);
      String[] ids=((BasicDBList)_referenceValue).toArray(new String[0]);
      for (int idx=ids.length - 1; idx >= 0; idx--) {
        ids[idx]="String_Node_Str" + ids[idx] + "String_Node_Str";
      }
      reference=Arrays.toString(ids);
    }
  }
 else {
    reference="String_Node_Str" + data.get("String_Node_Str").toString() + "String_Node_Str";
  }
  String db=(targetDb == null ? dbName : targetDb);
  if (role == ROLE.OWNING) {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.MANY_TO_ONE) {
      return URLUtilis.getUriWithDocId(context,db,targetCollection,reference);
    }
 else     if (type == TYPE.ONE_TO_MANY || type == TYPE.MANY_TO_MANY) {
      return URLUtilis.getUriWithFilterMany(context,db,targetCollection,referenceField,reference);
    }
  }
 else {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.ONE_TO_MANY) {
      return URLUtilis.getUriWithFilterOne(context,db,targetCollection,referenceField,reference);
    }
 else     if (type == TYPE.MANY_TO_ONE || type == TYPE.MANY_TO_MANY) {
      return URLUtilis.getUriWithFilterManyInverse(context,db,targetCollection,referenceField,reference);
    }
  }
  logger.debug("String_Node_Str",this,data);
  return null;
}