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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