juersimon opened a new issue, #5723:
URL: https://github.com/apache/netbeans/issues/5723
### Apache NetBeans version
Apache NetBeans 17
### What happened
When using instanceof with pattern matching a RuntimeException Uncompilable
code is thrown with JDK 17 if the program is started in Netbeans with run or
debug . The generated jar runs without errors.
This behavior is also the case with JDK 18, JDK 19/20 work.
`
Number n = Long.valueOf(1);
if (n instanceof Long l) {
System.out.println("Long: " + l);
}
`
### How to reproduce
The error occurs when an Ant project is created and Compile on Save is
activated. JDK 17 (or 18) is selected as the Java platform. The default
platform is irrelevant. JDK 17 is used as source/binary format.
The following compiles without errors and the jar produced runs with Java
17. If the program is started with debog or run in Netbeans, then the exception
is thrown. If JDK 19 or JDK 20 is selected as platform, run and debug work
without error.
`public class Netbeans17Instanceof {
public static void main(String[] args) {
try {
Number n = Long.valueOf(1);
if (n instanceof Long l) {
System.out.println("Long: " + l);
}
} catch (Exception ex) {
ex.printStackTrace(System.err);
}
}
}`
### Did this work correctly in an earlier version?
Apache NetBeans 15
### Operating System
Windows 10 / Ubuntu 22.04.02
### JDK
adoptium 17.0.6
### Apache NetBeans packaging
Apache NetBeans provided installer
### Anything else
_No response_
### Are you willing to submit a pull request?
No
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