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https://issues.apache.org/jira/browse/BEAM-9555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17063008#comment-17063008
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Xuebing Li commented on BEAM-9555:
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Thank you for the info [~iemejia]. Apologies for the dupe issue.
> Kotlin example incompatible with Gradle 6
> -----------------------------------------
>
> Key: BEAM-9555
> URL: https://issues.apache.org/jira/browse/BEAM-9555
> Project: Beam
> Issue Type: Bug
> Components: examples-java
> Reporter: Xuebing Li
> Priority: Major
> Fix For: Not applicable
>
>
> When compiling Kotlin example with Gradle 6, the following error appears.
> Note the "What went wrong" section.
> {noformat}
> $ gradle build
> Starting a Gradle Daemon, 1 incompatible and 1 stopped Daemons could not be
> reused, use --status for details
> > Task :buildSrc:spotlessGroovy FAILED
> FAILURE: Build failed with an exception.
> * What went wrong:
> Execution failed for task ':buildSrc:spotlessGroovy'.
> > You must declare outputs or use `TaskOutputs.upToDateWhen()` when using the
> > incremental task API
> * Try:
> Run with --stacktrace option to get the stack trace. Run with --info or
> --debug option to get more log output. Run with --scan to get full insights.
> * Get more help at https://help.gradle.org
> Deprecated Gradle features were used in this build, making it incompatible
> with Gradle 7.0.
> Use '--warning-mode all' to show the individual deprecation warnings.
> See
> https://docs.gradle.org/6.2.2/userguide/command_line_interface.html#sec:command_line_warnings
> BUILD FAILED in 4s
> {noformat}
> The cause is likely outdated version of spotless. [This GitHub
> issue|https://github.com/diffplug/spotless/issues/440] mentions the exact
> same error.
> P.S. I chose _examples-java_ as this Jira issue's component because
> _examples-kotlin_ is not an option.
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