Non-descriptive errors

[OlegYch]

When running scalafix via sbt i get (Compile / scalafix) scalafix.sbt.InvalidArgument: scalafix.v1.Rule: Error reading configuration file with no explanation what is wrong or even a stacktrace.
sbt-scalafix 0.10.1

[bjaglin]

Thanks for reporting!

I guess this comes from https://github.com/openjdk/jdk/blob/9a9add8825a040565051a09010b29b099c2e7d49/jdk/src/share/classes/java/util/ServiceLoader.java#L309 (Java 8, exact wording changed starting Java 9). Is there something special with the scalafix dependencies (community rules) or your JVM?

Removing exception wrapping in https://github.com/scalacenter/sbt-scalafix/blob/d1abcb1defcde78b9bb03d3dae7870dddfb98229/src/main/scala/scalafix/internal/sbt/ScalafixInterface.scala#L117 exposes the most likely silenced trace:

sbt:sbt-scalafix> scalafix
[info] Using SNAPSHOT artifacts for Scalafix and/or external rules, binary compatibility checks disabled
[error] stack trace is suppressed; run last Compile / scalafix for the full output
[error] (Compile / scalafix) java.util.ServiceConfigurationError: thrown manually for testing
[error] Total time: 1 s, completed Jun 24, 2022, 11:16:34 PM
sbt:sbt-scalafix> last Compile / scalafix
[error] java.util.ServiceConfigurationError: thrown manually for testing
[error] 	at scalafix.internal.v1.Rules$.all(Rules.scala:109)
[error] 	at scalafix.v1.RuleDecoder$$anon$1.<init>(RuleDecoder.scala:106)
[error] 	at scalafix.v1.RuleDecoder$.decoder(RuleDecoder.scala:105)
[error] 	at scalafix.internal.interfaces.ScalafixArgumentsImpl.rulesThatWillRun(ScalafixArgumentsImpl.scala:241)
[error] 	at scalafix.internal.sbt.ScalafixInterface.rulesThatWillRun(ScalafixInterface.scala:102)
[error] 	at scalafix.sbt.ScalafixPlugin$.$anonfun$scalafixTask$1(ScalafixPlugin.scala:364)

[bjaglin]

The latest sbt-scalafix snapshot should give you a stack trace

 // project/plugins.sbt
-addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.0")
+addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.10.1+4-22433065-SNAPSHOT")
+resolvers += Resolver.sonatypeRepo("snapshots")

Can you try it out on your build so we can see what we could do in scalafix itself?

[OlegYch]

i think the jar with rules was broken somehow, can't reproduce right now
the fix looks good to me, thanks!