I looked into what causes the build fail. There is an NP_NULL_ON_SOME_PATH error in line 291 of edu.umd.cs.findbugs.sarif.Location class (inside the inner class LogicalLocation) of the method toJsonObject():

Thank you very much for looking into it, I did not have much time to investigate but I saw that the code is handling the @TypeQualifierNickname on edu.umd.cs.findbugs.annotation.Nullable so, indeed, it is not necessary to add that one.
I probably made a mistake but when trying to remove it and building on my computer I still had the failing unit tests though, I couldn't understand why

Hello @JuditKnoll,
How did you see that issue with edu.umd.cs.findbugs.sarif.Location?
I'm probably doing it the wrong way but I use to build with the gradlew test command and then I look at tests results

The error I see is:

org.opentest4j.AssertionFailedError: Unexpected bugs (6):
missing NP_STORE_INTO_NONNULL_FIELD In TestNonNull1.java
missing NP_NONNULL_PARAM_VIOLATION At TestNonNull1.java:[line 30]
missing NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE At TestNonNull1.java:[line 18]
missing NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE At TestNonNull1.java:[lines 24-25]
missing NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE At TestNonNull2.java:[lines 33-34]
missing NP_NONNULL_PARAM_VIOLATION At TestNonNull2.java:[lines 13-14]
	at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:38)
	at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:138)
	at app//edu.umd.cs.findbugs.DetectorsTest.checkForUnexpectedBugs(DetectorsTest.java:142)
	at java.base@17.0.8.1/java.lang.reflect.Method.invoke(Method.java:568)
	at java.base@17.0.8.1/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base@17.0.8.1/java.util.ArrayList.forEach(ArrayList.java:1511)

I simply ran ./gradlew build or the same command as the github action does ./gradlew build smokeTest, which gives the following warning at the end* (this is from the github action check) :

Execution failed for task ':spotbugs:spotbugsMain'.
> A failure occurred while executing com.github.spotbugs.snom.internal.SpotBugsRunnerForHybrid$SpotBugsExecutor
   > Verification failed: SpotBugs ended with exit code 1. See the report at: file:///home/runner/work/spotbugs/spotbugs/spotbugs/build/reports/spotbugs/main.html

I looked at the report which contained that the error is at edu.umd.cs.findbugs.sarif.Location$LogicalLocation, line 291.
I have my doubts about whether the properties field really need to have the annotation edu.umd.cs.findbugs.annotation.Nullable, but I haven't checked it extensively.

The strange thing is, that earlier my output was the same as that of the github action check, but now, without any modification to the earlier version, the :spotbugs-tests:test task fails too, and get the same error as well as you wrote about. So there may be multiple problems.

*There are some other messages in connection with DumbMethods and IllegalArgumentEception when analyzing Issue2640, but those are not relevant here, since it's thrown even when the build is successful ( see the successful build on master ), and I think it's already solved #2643, just the maven plugin doesn't contain it yet.

I think that these warnings are from the spotbugs gradle plugin running on spotbugs' own code, so the analysis itself is done from an already released version, not from the freshly compiled version

EDIT: the issue was SpotBug flagging an issue in it's own code (in edu.umd.cs.findbugs.sarif.Location) thanks to the change

Hello @JuditKnoll, How did you see that issue with edu.umd.cs.findbugs.sarif.Location? I'm probably doing it the wrong way but I use to build with the gradlew test command and then I look at tests results

The error I see is:

org.opentest4j.AssertionFailedError: Unexpected bugs (6):
missing NP_STORE_INTO_NONNULL_FIELD In TestNonNull1.java
missing NP_NONNULL_PARAM_VIOLATION At TestNonNull1.java:[line 30]
missing NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE At TestNonNull1.java:[line 18]
missing NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE At TestNonNull1.java:[lines 24-25]
missing NP_PARAMETER_MUST_BE_NONNULL_BUT_MARKED_AS_NULLABLE At TestNonNull2.java:[lines 33-34]
missing NP_NONNULL_PARAM_VIOLATION At TestNonNull2.java:[lines 13-14]
	at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:38)
	at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:138)
	at app//edu.umd.cs.findbugs.DetectorsTest.checkForUnexpectedBugs(DetectorsTest.java:142)
	at java.base@17.0.8.1/java.lang.reflect.Method.invoke(Method.java:568)
	at java.base@17.0.8.1/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base@17.0.8.1/java.util.ArrayList.forEach(ArrayList.java:1511)

It looks like the error at edu.umd.cs.findbugs.sarif.Location$LogicalLocation is only hiding the one you got. Maybe converting these failing tests to AbstractIntegrationTest could help, or at least the debuging could be a bit easier.

@gtoison Can you fix merge conflict?

I have merged the conflict