pedro-w opened a new issue, #5260:
URL: https://github.com/apache/netbeans/issues/5260
### Apache NetBeans version
Apache NetBeans 16
### What happened
Certain projects cause a runtime exception when run or debugged in the IDE,
when the 'compile on save' option is selected in the project properties. One
trigger is using the `instanceof` pattern matching, e.g.
```
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
if (evt.getSource() instanceof JButton button) {
JOptionPane.showMessageDialog(this, String.format("Pressed
'%s'", button.getText()));
}
}
```
The exception is "Exception in thread "AWT-EventQueue-0"
java.lang.RuntimeException: Uncompilable code" - see below for more details.
The problem does not occur if compile on save is not selected, or when
running the build JAR direct from the command line.
Clean and build project does not help.
Clearing the NB cache does not help.
### How to reproduce
I've made a minimal project on github which reproduces always for me:
https://github.com/pedro-w/UncompilableCodeDemo
1. Clone this project and open in the IDE
2. Run and press the button on the form that appears - should be OK
3. Close app and select 'Compile on Save' in the project properties
4. Re-run and press the button - the exception should appear
```
Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException:
Uncompilable code
at demo.NewJFrame.jButton1ActionPerformed(NewJFrame.java:47)
at demo.NewJFrame$1.actionPerformed(NewJFrame.java:39)
at
java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1972)
at
java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2313)
```
...
```
at
java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at
java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
BUILD SUCCESSFUL (total time: 4 seconds)
```
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Windows 11 Pro 22H2 (x64)
### JDK
openjdk version "17.0.3" 2022-04-19 OpenJDK Runtime Environment
Temurin-17.0.3+7 (build 17.0.3+7) OpenJDK 64-Bit Server VM Temurin-17.0.3+7
(build 17.0.3+7, mixed mode, sharing)
### Apache NetBeans packaging
Apache NetBeans provided installer
### Anything else
_No response_
### Are you willing to submit a pull request?
Yes
### Code of Conduct
Yes
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