I have already reported the issue to Lombok project but have not heard anything back. I ran into this issue and had to go back to NetBeans 30 because we use Lombok in our large projects and the ide started breaking with the red errors, etc.
My ticket: https://github.com/projectlombok/lombok/issues/4066 Other ticket (not mine): https://github.com/projectlombok/lombok/issues/4072 Hope it helps. > On Aug 25, 2026, at 7:11 AM, Germano Di Fede <[email protected]> > wrote: > > Hello everyone, > > I am experiencing an issue with Lombok annotation processing inside the > NetBeans editor. When using annotations like @Data, @NoArgsConstructor, or > @AllArgsConstructor, the IDE throws an error and fails to recognize the > generated methods. > > My Environment: > > IDE: Apache NetBeans 31 > > NetBeans Runtime JDK: JDK 26 > > Project Target JDK: JDK 21 > > Lombok Version: 1.18.46 (latest) > > The Error: The IDE reports the following stack trace in the editor > tooltip/output: Can't initialize javac processor due to (most likely) a class > loader problem: java.lang.NoClassDefFoundError: Could not initialize class > lombok.javac.Javac at > lombok.javac.apt.LombokProcessor.placePostCompileAndDontMakeForceRoundDummiesHook(LombokProcessor.java:174) > at lombok.javac.apt.LombokProcessor.init(LombokProcessor.java:96) ... at > org.netbeans.modules.java.source.indexing.APTUtils$ErrorToleratingProcessor.init(APTUtils.java:1002) > > My thoughts: I suspect this is a compatibility issue caused by NetBeans > running on JDK 26, which might have changed or locked down some internal > com.sun.tools.javac APIs that Lombok 1.18.46 relies on during the IDE's > real-time code analysis. The project itself targets JDK 21. > > Has anyone else run into this specific issue with JDK 26? Should I downgrade > the JDK that NetBeans runs on to 21 as a workaround? If so, could you please > point me to the correct way to change the runtime JDK for NetBeans? Or is > there a way to configure nb-javac to handle this gracefully? > > Thanks in advance for any help or advice! > > Germano
