Upgrading to RELEASE250 with Java 21 causes java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release

[jdsmithsos]

Apache NetBeans version

Apache NetBeans 25

What happened

Using Java 21.
When upgrading the NetBeans version from RELEASE240 to RELEASE250.
The application project build completed successfully with no compile errors.
When running the successfully rebuilt project, get the following exception:

java.lang.UnsupportedOperationException: The Security Manager is deprecated and will be removed in a future release
	at java.base/java.lang.System.setSecurityManager(System.java:430)
	at org.netbeans.TopSecurityManager.install(TopSecurityManager.java:525)
	at org.netbeans.core.NbLifecycleManager.advancePolicy(NbLifecycleManager.java:69)
	at org.netbeans.core.GuiRunLevel.run(GuiRunLevel.java:84)
	at org.netbeans.core.startup.Main.start(Main.java:316)
	at org.netbeans.core.startup.TopThreadGroup.run(TopThreadGroup.java:98)
	at java.base/java.lang.Thread.run(Thread.java:1583)

I am using the NetBeans IDE version 25, which is also running on Java 21. The IDE works perfectly without startup error.

Language / Project Type / NetBeans Component

Java Maven application

How to reproduce

In the project Maven pom.xml change the netbeans.version to RELEASE250, rebuild, and run

Did this work correctly in an earlier version?

Apache NetBeans 24

Operating System

Windows 11

JDK

21

Apache NetBeans packaging

Apache NetBeans platform

Anything else

No response

Are you willing to submit a pull request?

No

[jdsmithsos]

I found a workaround.
In the application launcher.conf add

-J-DTopSecurityManager.disable=true

to default_options:

default_options="--branding saloonsadmin -J-Xms512m -J-Xmx1024m -J-DTopSecurityManager.disable=true"

[mbien]

this is resolved via #7928 (#8258) in NB 26. (-J-DTopSecurityManager.disable=true will become a no-op)

The PR was originally planned to target NB 25, but it was decided last minute to do one more release while disabling SM (#8169).

[mbien]

added a note to the release notes https://github.com/apache/netbeans/releases/tag/25