Throws NullPointerException without much other information

[ChetanBhasin]

I have been trying to use this plugin in an internal repository, but get a NullPointerException without much context for debugging.
Unfortunately, the code that I'm working with is private to my organisation so I cannot upload the entire thing on Github to help reproduce the issue.

But at the same time, there isn't much given by SBT to debug the issue, and the trace from last also wasn't something I could get my head around.

Here is the stack trace from sbt last:

[error]         at sbt.nio.Settings$.maybeAddOutputsAndFileStamps(Settings.scala:57)
[error]         at sbt.nio.Settings$.$anonfun$inject$1(Settings.scala:36)
[error]         at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:245)
[error]         at scala.collection.immutable.List.foreach(List.scala:392)
[error]         at scala.collection.TraversableLike.flatMap(TraversableLike.scala:245)
[error]         at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:242)
[error]         at scala.collection.immutable.List.flatMap(List.scala:355)
[error]         at sbt.nio.Settings$.inject(Settings.scala:34)
[error]         at sbt.internal.Load$.transformSettings(Load.scala:412)
[error]         at sbt.internal.Load$.$anonfun$buildConfigurations$2(Load.scala:388)
[error]         at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:245)
[error]         at scala.collection.MapLike$MappedValues.$anonfun$foreach$3(MapLike.scala:256)
[error]         at scala.collection.TraversableLike$WithFilter.$anonfun$foreach$1(TraversableLike.scala:877)
[error]         at scala.collection.immutable.Map$Map2.foreach(Map.scala:159)
[error]         at scala.collection.TraversableLike$WithFilter.foreach(TraversableLike.scala:876)
[error]         at scala.collection.MapLike$MappedValues.foreach(MapLike.scala:256)
[error]         at scala.collection.TraversableLike.flatMap(TraversableLike.scala:245)
[error]         at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:242)
[error]         at scala.collection.AbstractTraversable.flatMap(Traversable.scala:108)
[error]         at sbt.internal.Load$.$anonfun$buildConfigurations$1(Load.scala:378)
[error]         at scala.collection.TraversableLike.$anonfun$flatMap$1(TraversableLike.scala:245)
[error]         at scala.collection.Iterator.foreach(Iterator.scala:941)
[error]         at scala.collection.Iterator.foreach$(Iterator.scala:941)
[error]         at scala.collection.AbstractIterator.foreach(Iterator.scala:1429)
[error]         at scala.collection.IterableLike.foreach(IterableLike.scala:74)
[error]         at scala.collection.IterableLike.foreach$(IterableLike.scala:73)
[error]         at scala.collection.AbstractIterable.foreach(Iterable.scala:56)
[error]         at scala.collection.TraversableLike.flatMap(TraversableLike.scala:245)
[error]         at scala.collection.TraversableLike.flatMap$(TraversableLike.scala:242)
[error]         at scala.collection.AbstractTraversable.flatMap(Traversable.scala:108)
[error]         at sbt.internal.Load$.buildConfigurations(Load.scala:375)
[error]         at sbt.internal.Load$.$anonfun$apply$3(Load.scala:250)
[error]         at sbt.internal.Load$.timed(Load.scala:1390)
[error]         at sbt.internal.Load$.apply(Load.scala:250)
[error]         at sbt.internal.Load$.defaultLoad(Load.scala:55)
[error]         at sbt.BuiltinCommands$.liftedTree1$1(Main.scala:839)
[error]         at sbt.BuiltinCommands$.doLoadProject(Main.scala:839)
[error]         at sbt.BuiltinCommands$.$anonfun$loadProjectImpl$2(Main.scala:801)
[error]         at sbt.Command$.$anonfun$applyEffect$4(Command.scala:149)
[error]         at sbt.Command$.$anonfun$applyEffect$2(Command.scala:144)
[error]         at sbt.Command$.process(Command.scala:187)
[error]         at sbt.MainLoop$.process$1(MainLoop.scala:185)
[error]         at sbt.MainLoop$.processCommand(MainLoop.scala:220)
[error]         at sbt.MainLoop$.$anonfun$next$2(MainLoop.scala:142)
[error]         at sbt.State$StateOpsImpl$.runCmd$1(State.scala:273)
[error]         at sbt.State$StateOpsImpl$.process$extension(State.scala:277)
[error]         at sbt.MainLoop$.$anonfun$next$1(MainLoop.scala:142)
[error]         at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:19)
[error]         at sbt.MainLoop$.next(MainLoop.scala:142)
[error]         at sbt.MainLoop$.run(MainLoop.scala:133)
[error]         at sbt.MainLoop$.$anonfun$runWithNewLog$1(MainLoop.scala:111)
[error]         at sbt.io.Using.apply(Using.scala:27)
[error]         at sbt.MainLoop$.runWithNewLog(MainLoop.scala:105)
[error]         at sbt.MainLoop$.runAndClearLast(MainLoop.scala:60)
[error]         at sbt.MainLoop$.runLoggedLoop(MainLoop.scala:45)
[error]         at sbt.MainLoop$.runLogged(MainLoop.scala:36)
[error]         at sbt.StandardMain$.runManaged(Main.scala:132)
[error]         at sbt.xMain$.run(Main.scala:67)
[error]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[error]         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[error]         at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[error]         at java.base/java.lang.reflect.Method.invoke(Method.java:566)
[error]         at sbt.internal.XMainConfiguration.run(XMainConfiguration.scala:46)
[error]         at sbt.xMain.run(Main.scala:39)
[error]         at xsbt.boot.Launch$$anonfun$run$1.apply(Launch.scala:111)
[error]         at xsbt.boot.Launch$.withContextLoader(Launch.scala:130)
[error]         at xsbt.boot.Launch$.run(Launch.scala:111)
[error]         at xsbt.boot.Launch$$anonfun$apply$1.apply(Launch.scala:37)
[error]         at xsbt.boot.Launch$.launch(Launch.scala:119)
[error]         at xsbt.boot.Launch$.apply(Launch.scala:20)
[error]         at xsbt.boot.Boot$.runImpl(Boot.scala:56)
[error]         at xsbt.boot.Boot$.main(Boot.scala:18)
[error]         at xsbt.boot.Boot.main(Boot.scala)
[error] java.lang.NullPointerException
[error] Use 'last' for the full log.
[debug] > Exec(loadFailed, None, None)
[debug] > Exec(last, None, None)

I'm not sure what other information I can provide to help debug, but I'm happy to follow along and give any more information that I can.

[jsoref]

This seems to be caused by changing from sbt 1.2.8 to sbt 1.3.x

(At least, switching from 1.3.3 to 1.2.8 gives me a different error.)

[eatkins]

See sbt/sbt#5215. The NPE could probably be fixed in sbt-bazel by making Expr[Source] a concrete type. It is effectively a higher-kinded type due to type Expr[V] = Mu[ExprF[V, ?]]. The plugin arguably should not have compiled for any version of sbt because it is not possible to make a Manifest[Expr[Source]] or Manifest[BazelDsl].

[akter-pi]

If i add addSbtPlugin("com.stripe" % "sbt-bazel" % "0.0.1") in project/plugins.sbt

this java.lang.NullPointerException shows to me

[andyscott]

Thanks for filing an issue!

We are no longer using or maintaining this plugin.

I'll be archiving the repository shortly to ensure there's no confusion regarding support.