NPE with XMethod in 4.9.6

Exception analyzing com.acme.common.utils.AnvilUtil
using detector edu.umd.cs.findbugs.detect.MultipleInstantiationsOfSingletons
java.lang.NullPointerException: Cannot invoke "edu.umd.cs.findbugs.ba.XMethod.getClassName()" because "xmethod" is null
At edu.umd.cs.findbugs.MethodAnnotation.fromXMethod(MethodAnnotation.java:264)
At edu.umd.cs.findbugs.BugInstance.addMethod(BugInstance.java:1511)
At edu.umd.cs.findbugs.detect.MultipleInstantiationsOfSingletons.visitAfter(MultipleInstantiationsOfSingletons.java:254)
At edu.umd.cs.findbugs.visitclass.PreorderVisitor.visitJavaClass(PreorderVisitor.java:409)

This might be the same issue as #3669
I suppose you cannot share the class triggering the error but is there something unusual about the method signatures in that class?

right... Incredibly bog standard class

Implements cloneable, has a static inner class... But wrt method signatures, doesn't even use generics anywhere.

Actually now that i look at it, it declares being Cloneable but relies on Object for implementation.

Yeah it's coming from here

            if (isCloneable) {
                if (implementsCloneableDirectly) { // directly
                    bugReporter.reportBug(new BugInstance(this, "SING_SINGLETON_IMPLEMENTS_CLONEABLE", NORMAL_PRIORITY).addClass(this)
                            .addMethod(cloneMethod));
                }

that cloneMethod is null

Can you please check, does this also happen with SpotBugs 4.9.3? Are there other NPEs with other detectors as well?
If it does not happen with the earlier version, there might be something bigger behind the scenes and the null check would not solve the problem, just hide it.

Happens in 4.9.3 as well.

[SPARK-54678] Upgrade `spotbugs-tool` to 4.9.8 and `spotbugs-plugin` …

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NPE with XMethod in 4.9.6 #3727

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NPE with XMethod in 4.9.6 #3727

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gtoison commented on Sep 22, 2025

mebigfatguy commented on Sep 22, 2025

mebigfatguy commented on Sep 23, 2025

JuditKnoll commented on Sep 23, 2025

mebigfatguy commented on Sep 23, 2025

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