Re: Editing a GUI form using JPA

I had the same problem where I had a panel with some comboboxes which 
should be populated by values from the database.
I worked around it by extracting the database calls into it's own method 
which needed to be called manually after constructing the panel:

Within my TopComponent I construct the offending panel:

PersonPanel personPanel = new PersonPanel();
personPanel.setDb(db);     // db is my object to communicate with the 
database
personPanel.initCombo();   // init the components that needs data from 
the database

And the PersonPanel#initCombo() method contains the stuff that I had 
before in the constructor:

     public void initCombo() {
         List<Person> persons = db.getPersons();
         Person[] toArray = persons.toArray(Person[]::new);
         comboPerson.setModel(new 
javax.swing.DefaultComboBoxModel<>(toArray));
         comboPerson.setRenderer(new PersonComboRenderer());
     }

Maybe not the most elegant way but it worked for my case.

On 7/9/25 21:10, Ricardo Palomares wrote:
> Hi all,
> 
> After a lot of time, I'm trying to come back to Java development. I have 
> an Ant-based Java SE project using Swing and EclipseLink JPA 2.1 
> originally developed in Java 8 and NetBeans 8.2. I'm now using Java 17 
> and NetBeans 25 (I have 26 also installed, but I don't think this has to 
> do with 25 vs. 26). On opening a GUI component that invokes an 
> EntityManager I get this error:
> 
> 
> 
> 
> Other GUI components not involving DB connection (like the main window, 
> with a JFrame and a classic dropdown top menu) can be opened and edited 
> without any problem.
> 
> The project, however, apparently clean and builds OK. I've replaced the 
> original EclipseLink JPA 2.1 library in the project for the global 
> EclipseLink 2.2.3, but still I keep getting the same error on GUI 
> editing. Any hint about where to start to look?
> 
> TIA
> 
> -- 
> Ricardo Palomares (RickieES)
> https://github.com/RickieES
> https://sourceforge.net/u/rpalomares/profile
> http://stackoverflow.com/users/1185157/
> 

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