Sonar scanner raises IllegalArgumentExceptions for 20 findbug detectors on one class

[camproto]

Issue Description

Sonar scanner raises IllegalArgumentException for 20 findbugs detectors for one class. The error message "can't push void" does not help me to see the reason. Therefore I cannot fix the class source code.

See log extract.
sonar-scanner-java-findbugs-exception-log.txt

Environment

Component	Version
SonarQube	Community Edition - Version 9.9.3 (build 79811)
sonar scanner	5.0.0.4389
Sonar-FindBugs	findbugs 4.2.9
Maven	mvnw 3.9.9
Java	RedHat_JDK17.0.5.0.8

[gtoison]

Hello, this seems to be an error in SpotBugs, when it tries to find the type returned by a method.
Reading the code it is not obvious what might be happening but I suspect the issue might be with a generics method signature.
Would you be able to share more information about the class triggering the bug?

[camproto]

Hello Guillaume, thank you for your reply.
I cannot share the whole source code here, because it is from a closed source project.

The class is a Log4j layout, extends AbstractStringLayout, quite comprehensive with 350 lines. Deals with exception stacktrace formatting and create a JSON format for logging output.

Generics are not used in this class at all. What I think is special is the usage of 2 static final classes for grouping constants, one public and one private. The public one was before package visible only, what I guessed could be a missing type. But still after the change to public for the class and the constants within the exceptions arises.

Would appreciate if you had any more idea. Will clarify if I can share may be method signatures only.

[camproto]

I let the sonar scanner run localy and remove parts of the source of this class to find the line with the problem.

[gtoison]

Thank you, if you are willing it is also possible to debug this locally using mvnDebug instead of mvn