CollectionDatasource Error

Support
#1

I’m attempting to replicate the “sample/web/airports_3/airport/airport-browse.xml” screen included in the “screen-manipulation” example.
What I’m trying to do is connect two grids (like master-details).
I get an error in this line:

    
@Inject
private CollectionDatasource<TAree, UUID> tAreeDs;

.java:24: error: type argument TAree is not within bounds of type-variable T
private CollectionDatasource<TAree, UUID> tAreeDs;

My datasource is a MSSQL database.
Table TAree has only two fields:

  • ID_Area (PK, int)
  • Area (string)

I cannot find a solution.
Thank you
Michele

#2

Hello everyone.
I realized that the problem exists when the table as a PK (int, not null, identity).
If the PK is, for example, char(1) there is no problem.

Steps to reproduce:

  1. Create table (in my environment is MSSQL)
    CREATE TABLE [dbo].[TabTest](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Valore] nvarchar NOT NULL,
    CONSTRAINT [PK_TabTest] PRIMARY KEY CLUSTERED
    (
    [ID] ASC
    )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
    ) ON [PRIMARY]

  2. Create new Cuba Project

  3. Generate model with this table and choose to create a Single Screen type

  4. Build project

You receive an error like this:

java:29: error: type argument TabTest is not within bounds of type-variable T
private CollectionDatasource<TabTest, IdProxy> tabTestsDs;
^
where T,K are type-variables:
T extends Entity declared in interface CollectionDatasource
K extends Object declared in interface CollectionDatasource
1 error
FAILED

FAILURE: Build failed with an exception.

Thanks for your help.

#3

The problem is with 6.6.x Platform version.
Everything works properly with 6.5.7.

#4

Hi Michele,

Thank you for the detailed reporting of the problem.

The screen template for combined screen is indeed invalid. We have created an issue: https://youtrack.cuba-platform.com/issue/STUDIO-3954 and we’ll fix it in the next bug-fix Studio release.

You can fix the problem in your code if you add a type parameter corresponding to your entity PK type:

private CollectionDatasource<TabTest, IdProxy<Integer>> tabTestsDs;

or

private CollectionDatasource<TabTest, IdProxy<Long>> tabTestsDs;