Hi, This plugin seams to be very promising. I am happy, that you are working on it.

NPE occurred during singing task. It could be related with our previous problems with adding p.12 file with certificate, which we finally added, but it display as a blank item on the list (screenshot). We used pipeline to check if the key is there, and it was.

If I could help someway in fixing this problem, please tell me.

java.lang.NullPointerException
at org.jenkinsci.plugins.androidsigning.SignApksBuilder.perform(SignApksBuilder.java:274)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:81)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:730)
at hudson.model.Build$BuildExecution.build(Build.java:206)
at hudson.model.Build$BuildExecution.doRun(Build.java:163)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:490)
at hudson.model.Run.execute(Run.java:1735)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:415)
Build step 'Sign Android APKs' marked build as failure