Program: 93556
Project: 93556
Buggy source:
/** 
 * @param context
 * @param dbName
 * @param collName
 * @param data
 * @return
 * @throws IllegalArgumentException
 * @throws org.restheart.utils.UnsupportedDocumentIdException
 */
public String getRelationshipLink(RequestContext context,String dbName,String collName,DBObject data) throws IllegalArgumentException, UnsupportedDocumentIdException {
  Object _referenceValue=data.get(referenceField);
  Object[] ids=null;
  Object id=null;
  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);
      }
      id=_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);
      }
      ids=((BasicDBList)_referenceValue).toArray();
    }
  }
 else {
    id=data.get("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 URLUtils.getUriWithDocId(context,db,targetCollection,id,refFieldType);
    }
 else     if (type == TYPE.ONE_TO_MANY || type == TYPE.MANY_TO_MANY) {
      return URLUtils.getUriWithFilterMany(context,db,targetCollection,referenceField,ids,RequestContext.DOC_ID_TYPE.STRING != refFieldType);
    }
  }
 else {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.ONE_TO_MANY) {
      return URLUtils.getUriWithFilterOne(context,db,targetCollection,referenceField,ids,RequestContext.DOC_ID_TYPE.STRING != refFieldType);
    }
 else     if (type == TYPE.MANY_TO_ONE || type == TYPE.MANY_TO_MANY) {
      return URLUtils.getUriWithFilterManyInverse(context,db,targetCollection,referenceField,ids,RequestContext.DOC_ID_TYPE.STRING != refFieldType);
    }
  }
  LOGGER.debug("String_Node_Str",this,data);
  return null;
}

Fixed version (ground truth):
/** 
 * @param context
 * @param dbName
 * @param collName
 * @param data
 * @return
 * @throws IllegalArgumentException
 * @throws org.restheart.utils.UnsupportedDocumentIdException
 */
public String getRelationshipLink(RequestContext context,String dbName,String collName,DBObject data) throws IllegalArgumentException, UnsupportedDocumentIdException {
  Object _referenceValue=data.get(referenceField);
  Object[] ids=null;
  Object id=null;
  if (role == ROLE.OWNING) {
    if (_referenceValue == null) {
      return null;
    }
    if (type == TYPE.ONE_TO_ONE || type == TYPE.MANY_TO_ONE) {
      id=_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);
      }
      ids=((BasicDBList)_referenceValue).toArray();
    }
  }
 else {
    id=data.get("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 URLUtils.getUriWithDocId(context,db,targetCollection,id,refFieldType);
    }
 else     if (type == TYPE.ONE_TO_MANY || type == TYPE.MANY_TO_MANY) {
      return URLUtils.getUriWithFilterMany(context,db,targetCollection,ids,RequestContext.DOC_ID_TYPE.STRING != refFieldType);
    }
  }
 else {
    if (type == TYPE.ONE_TO_ONE || type == TYPE.ONE_TO_MANY) {
      return URLUtils.getUriWithFilterOne(context,db,targetCollection,referenceField,ids,RequestContext.DOC_ID_TYPE.STRING != refFieldType);
    }
 else     if (type == TYPE.MANY_TO_ONE || type == TYPE.MANY_TO_MANY) {
      return URLUtils.getUriWithFilterManyInverse(context,db,targetCollection,referenceField,ids,RequestContext.DOC_ID_TYPE.STRING != refFieldType);
    }
  }
  LOGGER.debug("String_Node_Str",this,data);
  return null;
}