| "Instantiation Exception" [message #65594] |
Thu, 07 October 2004 19:21  |
Eclipse User |
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Originally posted by: cdouglas.nospam.oz.net
I laid out a nice screen set with VE, and now I'm trying to add some
"controller" behavior.
I locally subclassed a JPanel to add ActionListener and FocusListener
interfaces. I put some buttons inside this panel, and now VE won't draw it
and complains of a "java.lang.InstantiationException (dialogs.PatientDialog
$GenderPanel)" from the Java Beans view. Nothing in the PDE log seems
relevant (although there are some errors on other fields). It compiles and
runs correctly.
Here is my internal class:
public class GenderPanel extends JPanel implements ActionListener,
FocusListener {
public void actionPerformed(ActionEvent e) {
setGender();
}
public void focusGained(FocusEvent e) {
// ignore
}
public void focusLost(FocusEvent e) {
setGender();
}
private void setGender() {
if (maleButton.isSelected()) {
patient.setGender(1);
}
else if (femaleButton.isSelected()) {
patient.setGender(2);
}
}
}
And here is the VE generated code for the panel:
private PatientDialog.GenderPanel getNewGenderPanel() {
if (newGenderPanel == null) {
newGenderPanel = new PatientDialog.GenderPanel();
newGenderPanel.setBounds(31, 35, 161, 55);
newGenderPanel.add(getMaleButton(), null);
newGenderPanel.add(getFemaleButton(), null);
}
return newGenderPanel;
}
I'm using Eclipse: 200409161125
With VE/EMF/GEF from the update site
An I going about this the wrong way?
Chas Douglass
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| Re: "Instantiation Exception" [message #65615 is a reply to message #65594] |
Thu, 07 October 2004 20:06  |
| Eclipse User |
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Originally posted by: richkulp.us.NO_SPAM.ibm.com
We don't support non-static inner classes. The problem with non-static
inner classes is that to instantiate them we need to have an instance of
the outer class. But since that is class being developed, there is no
outer class instance to get an instance of. So you get an
InstantiationError.
If it was static inner class we could do it. But the better way is not
use an inner class. Since you only need one instance of this class, and
you aren't using it anywhere else (or more than once), then just drop a
JPanel and and an Action and Focus event to it using the Add Events...
from the popup menu on the JPanel.
--
Thanks,
Rich Kulp
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| Re: "Instantiation Exception" [message #65634 is a reply to message #65615] |
Thu, 07 October 2004 20:28 |
| Eclipse User |
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Originally posted by: cdouglas.nospam.oz.net
Rich Kulp <richkulp@us.NO_SPAM.ibm.com> wrote in
news:ck47b3$51f$1@eclipse.org:
> We don't support non-static inner classes. The problem with non-static
> inner classes is that to instantiate them we need to have an instance
> of the outer class. But since that is class being developed, there is
> no outer class instance to get an instance of. So you get an
> InstantiationError.
>
> If it was static inner class we could do it. But the better way is not
> use an inner class. Since you only need one instance of this class,
> and you aren't using it anywhere else (or more than once), then just
> drop a JPanel and and an Action and Focus event to it using the Add
> Events... from the popup menu on the JPanel.
>
Thanks, as it turns out, the panel doesn't get any interesting events
anyway.
I'm now putting the controller code into the "getXXX()" routine
generated by VE. When I add some initialization (like:
if (patient.getGender() == 1) {
button.setSelected(true);
}
And then add the "action performed" event with VE, VE decides to add the
code right after the opening brace of that code -- which in this case
means if my patient isn't male, there will be no action listener.
Of course I fixed it manually, but how does VE decide where to put code?
Is there a more appropriate place for me to put my initialization?
Thanks for your help.
Chas Douglass
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| Re: "Instantiation Exception" [message #65655 is a reply to message #65634] |
Thu, 07 October 2004 20:57 |
| Eclipse User |
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Originally posted by: richkulp.us.NO_SPAM.ibm.com
It shouldn't do that. It should of put it either before or after the if
statement and its then/else expressions.
Please open a Bugzilla against VE product, and JavaCore component.
Add into the comment for the bug the actual final code that the VE
generates, show us the whole getButton() method please.
--
Thanks,
Rich Kulp
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| Re: "Instantiation Exception" [message #601059 is a reply to message #65594] |
Thu, 07 October 2004 20:06 |
| Eclipse User |
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Originally posted by: richkulp.us.NO_SPAM.ibm.com
We don't support non-static inner classes. The problem with non-static
inner classes is that to instantiate them we need to have an instance of
the outer class. But since that is class being developed, there is no
outer class instance to get an instance of. So you get an
InstantiationError.
If it was static inner class we could do it. But the better way is not
use an inner class. Since you only need one instance of this class, and
you aren't using it anywhere else (or more than once), then just drop a
JPanel and and an Action and Focus event to it using the Add Events...
from the popup menu on the JPanel.
--
Thanks,
Rich Kulp
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| Re: "Instantiation Exception" [message #601066 is a reply to message #65634] |
Thu, 07 October 2004 20:57 |
| Eclipse User |
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Originally posted by: richkulp.us.NO_SPAM.ibm.com
It shouldn't do that. It should of put it either before or after the if
statement and its then/else expressions.
Please open a Bugzilla against VE product, and JavaCore component.
Add into the comment for the bug the actual final code that the VE
generates, show us the whole getButton() method please.
--
Thanks,
Rich Kulp
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