Program: 64203
Project: 64203
Buggy source:
protected Response removeAttributeInternal(String version,String persistenceUnit,String type,String key,String attribute,String listItemId,String partner,HttpHeaders hh,UriInfo ui){
  PersistenceContext app=getPersistenceContext(persistenceUnit,ui.getBaseUri(),version,null);
  if (app == null || app.getClass(type) == null) {
    if (app == null) {
      JPARSLogger.fine("String_Node_Str",new Object[]{persistenceUnit});
    }
 else {
      JPARSLogger.fine("String_Node_Str",new Object[]{type,persistenceUnit});
    }
    return Response.status(Status.BAD_REQUEST).build();
  }
  if ((attribute == null) && (listItemId == null)) {
    return Response.status(Status.BAD_REQUEST).build();
  }
  Object id=IdHelper.buildId(app,type,key);
  ClassDescriptor descriptor=app.getDescriptor(type);
  DatabaseMapping mapping=(DatabaseMapping)descriptor.getMappingForAttributeName(attribute);
  if (!mapping.isForeignReferenceMapping()) {
    JPARSLogger.fine("String_Node_Str",new Object[]{attribute,type,key,persistenceUnit});
    return Response.status(Status.NOT_FOUND).build();
  }
  Map<String,String> discriminators=getMatrixParameters(ui,persistenceUnit);
  Object entity=app.find(discriminators,type,id,getQueryParameters(ui));
  Object result=app.removeAttribute(getMatrixParameters(ui,persistenceUnit),type,id,attribute,listItemId,entity,partner);
  if (result == null) {
    JPARSLogger.fine("String_Node_Str",new Object[]{attribute,type,key,persistenceUnit});
    return Response.status(Status.NOT_FOUND).build();
  }
 else {
    return Response.ok(new StreamingOutputMarshaller(app,result,hh.getAcceptableMediaTypes())).build();
  }
}

Fixed version (ground truth):
protected Response removeAttributeInternal(String version,String persistenceUnit,String type,String key,String attribute,HttpHeaders hh,UriInfo ui){
  String listItemId=null;
  Map<String,String> matrixParams=getMatrixParameters(ui,attribute);
  Map<String,Object> queryParams=getQueryParameters(ui);
  if ((queryParams != null) && (!queryParams.isEmpty())) {
    listItemId=(String)queryParams.get(QueryParameters.JPARS_LIST_ITEM_ID);
  }
  String partner=getRelationshipPartner(matrixParams,queryParams);
  PersistenceContext app=getPersistenceContext(persistenceUnit,ui.getBaseUri(),version,null);
  if (app == null || app.getClass(type) == null) {
    if (app == null) {
      JPARSLogger.fine("String_Node_Str",new Object[]{persistenceUnit});
    }
 else {
      JPARSLogger.fine("String_Node_Str",new Object[]{type,persistenceUnit});
    }
    return Response.status(Status.BAD_REQUEST).build();
  }
  if ((attribute == null) && (listItemId == null)) {
    return Response.status(Status.BAD_REQUEST).build();
  }
  Object id=IdHelper.buildId(app,type,key);
  ClassDescriptor descriptor=app.getDescriptor(type);
  DatabaseMapping mapping=(DatabaseMapping)descriptor.getMappingForAttributeName(attribute);
  if (!mapping.isForeignReferenceMapping()) {
    JPARSLogger.fine("String_Node_Str",new Object[]{attribute,type,key,persistenceUnit});
    return Response.status(Status.NOT_FOUND).build();
  }
  Map<String,String> discriminators=getMatrixParameters(ui,persistenceUnit);
  Object entity=app.find(discriminators,type,id,getQueryParameters(ui));
  Object result=app.removeAttribute(getMatrixParameters(ui,persistenceUnit),type,id,attribute,listItemId,entity,partner);
  if (result == null) {
    JPARSLogger.fine("String_Node_Str",new Object[]{attribute,type,key,persistenceUnit});
    return Response.status(Status.NOT_FOUND).build();
  }
 else {
    return Response.ok(new StreamingOutputMarshaller(app,result,hh.getAcceptableMediaTypes())).build();
  }
}