Spotless Gradle plugin 7.0.0-BETA4 fails with "Cannot fingerprint input property 'stepsInternalEquality'"

[breskeby]

I'm testing updating the elasticsearch build to use the Spotless Gradle plugin 7.0.0-BETA4.

In our CI we see multiple spotlessJava tasks in our build failing due to this error message:

Cannot fingerprint input property 'stepsInternalEquality': value 'com.diffplug.spotless.ConfigurationCacheHackList@a34eb6af' cannot be serialized.
> java.io.IOException: Failed to load eclipse jdt formatter: java.lang.RuntimeException: java.io.IOException: failed to rename /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0.tmp to /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0
  > Failed to load eclipse jdt formatter: java.lang.RuntimeException: java.io.IOException: failed to rename /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0.tmp to /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0
    > java.io.IOException: failed to rename /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0.tmp to /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0
      > failed to rename /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0.tmp to /opt/buildkite-agent/.m2/repository/dev/equo/p2-data/metadata/connection/262c4c2033ccf5f3c3389c1676a00fac.0

The further stacktrace

at dev.equo.solstice.p2.Unchecked.wrap(Unchecked.java:25) |  
-- | --
  | at dev.equo.solstice.p2.P2Model.query(P2Model.java:144) |  
  | at com.diffplug.spotless.extra.EquoBasedStepBuilder.lambda$build$0(EquoBasedStepBuilder.java:113) |  
  | at com.diffplug.spotless.JarState$Promised.get(JarState.java:53) |  
  | at com.diffplug.spotless.extra.EquoBasedStepBuilder$EquoStep.state(EquoBasedStepBuilder.java:168) |  
  | at com.diffplug.spotless.extra.EquoBasedStepBuilder.lambda$build$cc29b8bc$1(EquoBasedStepBuilder.java:129) |  
  | at com.diffplug.spotless.FormatterStepSerializationRoundtrip.stateSupplier(FormatterStepSerializationRoundtrip.java:57) |  
  | at com.diffplug.spotless.ThrowingEx.get(ThrowingEx.java:67) |  
  | at com.diffplug.spotless.FormatterStepSerializationRoundtrip$HackClone.writeObject(FormatterStepSerializationRoundtrip.java:113) |  
  | at jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)

It runs on Ubuntu 20.04.6

My changes are public available https://github.com/breskeby/elasticsearch/tree/update-spotless-gradle-plugin-700beta4

We don't run this in configuration cache mode.