Scala and Java 8 in the same project?

[Choonster]

Has anyone managed to get Scala and Java 8 working in the same project? I've got a test mod here that's configured to compile both Scala and Java through the Scala plugin, but the compiler fails when it encounters Java 8 features like static methods in interfaces.

 

This is what

gradlew --stacktrace build

outputs:

****************************

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Searge, ProfMobius, Fesh0r,

R4wk, ZeuX, IngisKahn, bspkrs

MCP Data version : 9.10

****************************

:deobfCompileDummyTask

:deobfProvidedDummyTask

:compileApiJava UP-TO-DATE

:compileApiScala UP-TO-DATE

:processApiResources UP-TO-DATE

:apiClasses UP-TO-DATE

:sourceMainJava UP-TO-DATE

:compileJava UP-TO-DATE

:sourceMainScala UP-TO-DATE

:compileScalaC:\Users\USER\Documents\Minecraft\ScalaJava8Test\build\sources\main\scala\com\choonster\scalajava8test\TestInterface.java:11: `;' expected but `{' found.

static void callScalaFunction(Function1<String, Unit> function) {

                                                                ^

one error found

FAILED

 

FAILURE: Build failed with an exception.

 

* What went wrong:

Execution failed for task ':compileScala'.

> Compilation failed

 

* Try:

Run with --info or --debug option to get more log output.

 

* Exception is:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':compileScala'.

at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)

at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)

at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)

at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:64)

at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)

at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)

at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)

at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)

at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)

at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:208)

at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:186)

at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:62)

at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)

at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)

at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:111)

at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)

at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)

at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)

at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)

at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)

at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)

at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)

at org.gradle.initialization.DefaultGradleLauncher$6.run(DefaultGradleLauncher.java:174)

at org.gradle.internal.Factories$1.create(Factories.java:22)

at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)

at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:47)

at org.gradle.initialization.DefaultGradleLauncher.runBuildOperation(DefaultGradleLauncher.java:189)

at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:171)

at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:35)

at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:104)

at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:97)

at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)

at org.gradle.initialization.DefaultGradleLauncher.runRootBuildOperation(DefaultGradleLauncher.java:184)

at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:97)

at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)

at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:93)

at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)

at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)

at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:43)

at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:27)

at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:72)

at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:44)

at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:50)

at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:27)

at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:40)

at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:170)

at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:237)

at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:210)

at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)

at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)

at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:206)

at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)

at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)

at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)

at org.gradle.launcher.Main.doAction(Main.java:33)

at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)

at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:54)

at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:35)

at org.gradle.launcher.GradleMain.main(GradleMain.java:23)

at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)

at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:127)

at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)

Caused by: org.gradle.api.internal.tasks.compile.CompilationFailedException: Compilation failed

at org.gradle.api.internal.tasks.scala.ZincScalaCompiler$Compiler.execute(ZincScalaCompiler.java:71)

at org.gradle.api.internal.tasks.scala.ZincScalaCompiler.execute(ZincScalaCompiler.java:48)

at org.gradle.api.internal.tasks.scala.ZincScalaCompiler.execute(ZincScalaCompiler.java:37)

at org.gradle.api.internal.tasks.compile.daemon.CompilerDaemonServer.execute(CompilerDaemonServer.java:53)

at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)

at org.gradle.messaging.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)

at org.gradle.messaging.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:360)

at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)

at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)

Caused by: Compilation failed

at sbt.compiler.AnalyzingCompiler.call(AnalyzingCompiler.scala:105)

at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:48)

at sbt.compiler.AnalyzingCompiler.compile(AnalyzingCompiler.scala:41)

at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply$mcV$sp(AggressiveCompile.scala:99)

at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:99)

at sbt.compiler.AggressiveCompile$$anonfun$3$$anonfun$compileScala$1$1.apply(AggressiveCompile.scala:99)

at sbt.compiler.AggressiveCompile.sbt$compiler$AggressiveCompile$$timed(AggressiveCompile.scala:166)

at sbt.compiler.AggressiveCompile$$anonfun$3.compileScala$1(AggressiveCompile.scala:98)

at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:143)

at sbt.compiler.AggressiveCompile$$anonfun$3.apply(AggressiveCompile.scala:87)

at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:39)

at sbt.inc.IncrementalCompile$$anonfun$doCompile$1.apply(Compile.scala:37)

at sbt.inc.IncrementalCommon.cycle(Incremental.scala:99)

at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:38)

at sbt.inc.Incremental$$anonfun$1.apply(Incremental.scala:37)

at sbt.inc.Incremental$.manageClassfiles(Incremental.scala:65)

at sbt.inc.Incremental$.compile(Incremental.scala:37)

at sbt.inc.IncrementalCompile$.apply(Compile.scala:27)

at sbt.compiler.AggressiveCompile.compile2(AggressiveCompile.scala:157)

at sbt.compiler.AggressiveCompile.compile1(AggressiveCompile.scala:71)

at com.typesafe.zinc.Compiler.compile(Compiler.scala:193)

at com.typesafe.zinc.Compiler.compile(Compiler.scala:174)

at com.typesafe.zinc.Compiler.compile(Compiler.scala:165)

at org.gradle.api.internal.tasks.scala.ZincScalaCompiler$Compiler.execute(ZincScalaCompiler.java:69)

... 8 more

 

 

BUILD FAILED

 

Total time: 8.315 secs

 

 

 

Attempting to run the client in IDEA outputs the following errors:

Error: scalac: 'jvm-1.8' is not a valid choice for '-target'

Error: scalac: bad option: '-target:jvm-1.8'

 

I'd like to get this working in mixed compilation mode (the default) so Java and Scala code can reference each other in either direction.