JDK 14 support

[kevinrushforth]

Expected Behavior

gradle should run with the latest JDK 14 ea.

Current Behavior

gradle -version works, but running any gradle task, including gradle tasks will throw an exception right away.

Context

Trying to do a build using the latest version of gradle.

Steps to Reproduce

1. Download the latest JDK 14 EA build from http://jdk.java.net/14/
2. Set your PATH and JAVA_HOME variables to point to jdk-14
3. Run gradle -version -- that correctly prints:

------------------------------------------------------------
Gradle 5.5.1
------------------------------------------------------------

Build time:   2019-07-10 20:38:12 UTC
Revision:     3245f748c7061472da4dc184991919810f7935a5

Kotlin:       1.3.31
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.14 compiled on March 12 2019
JVM:          14-ea (Oracle Corporation 14-ea+9-288)
OS:           Linux 4.4.0-157-generic amd64

4. Now run gradle tasks (it doesn't matter what is in your build.gradle file or whether you even have one) -- it will fail with the following exception:

java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.vmplugin.v7.Java7
        at org.codehaus.groovy.vmplugin.VMPluginFactory.<clinit>(VMPluginFactory.java:43)
        at org.codehaus.groovy.reflection.GroovyClassValueFactory.<clinit>(GroovyClassValueFactory.java:35)
        at org.codehaus.groovy.reflection.ClassInfo.<clinit>(ClassInfo.java:109)
        at org.codehaus.groovy.reflection.ReflectionCache.getCachedClass(ReflectionCache.java:95)
        at org.codehaus.groovy.reflection.ReflectionCache.<clinit>(ReflectionCache.java:39)
        at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.registerMethods(MetaClassRegistryImpl.java:209)
        at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.<init>(MetaClassRegistryImpl.java:107)
        at org.codehaus.groovy.runtime.metaclass.MetaClassRegistryImpl.<init>(MetaClassRegistryImpl.java:85)
        at groovy.lang.GroovySystem.<clinit>(GroovySystem.java:36)
        at org.codehaus.groovy.runtime.InvokerHelper.<clinit>(InvokerHelper.java:86)
        at groovy.lang.GroovyObjectSupport.getDefaultMetaClass(GroovyObjectSupport.java:59)
        at groovy.lang.GroovyObjectSupport.<init>(GroovyObjectSupport.java:32)
        at org.gradle.internal.extensibility.DefaultExtraPropertiesExtension.<init>(DefaultExtraPropertiesExtension.java:29)
        at org.gradle.internal.extensibility.DefaultConvention.<init>(DefaultConvention.java:48)
        at org.gradle.api.internal.plugins.DefaultConvention.<init>(DefaultConvention.java:28)
        at org.gradle.internal.extensibility.ExtensibleDynamicObject.<init>(ExtensibleDynamicObject.java:60)
        at org.gradle.internal.instantiation.MixInExtensibleDynamicObject.<init>(MixInExtensibleDynamicObject.java:34)
        at org.gradle.initialization.DefaultSettings_Decorated.getAsDynamicObject(Unknown Source)
        at org.gradle.initialization.SettingsFactory.createSettings(SettingsFactory.java:58)
        at org.gradle.initialization.ScriptEvaluatingSettingsProcessor.process(ScriptEvaluatingSettingsProcessor.java:60)
        at org.gradle.initialization.PropertiesLoadingSettingsProcessor.process(PropertiesLoadingSettingsProcessor.java:37)
        at org.gradle.initialization.SettingsEvaluatedCallbackFiringSettingsProcessor.process(SettingsEvaluatedCallbackFiringSettingsProcessor.java:34)
        at org.gradle.initialization.RootBuildCacheControllerSettingsProcessor.process(RootBuildCacheControllerSettingsProcessor.java:36)
        at org.gradle.initialization.BuildOperationSettingsProcessor$2.call(BuildOperationSettingsProcessor.java:50)
        at org.gradle.initialization.BuildOperationSettingsProcessor$2.call(BuildOperationSettingsProcessor.java:47)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.initialization.BuildOperationSettingsProcessor.process(BuildOperationSettingsProcessor.java:47)
        at org.gradle.initialization.DefaultSettingsLoader.findSettingsAndLoadIfAppropriate(DefaultSettingsLoader.java:104)
        at org.gradle.initialization.DefaultSettingsLoader.findAndLoadSettings(DefaultSettingsLoader.java:45)
        at org.gradle.initialization.SettingsAttachingSettingsLoader.findAndLoadSettings(SettingsAttachingSettingsLoader.java:35)
        at org.gradle.internal.composite.ChildBuildRegisteringSettingsLoader.findAndLoadSettings(ChildBuildRegisteringSettingsLoader.java:47)
        at org.gradle.initialization.DefaultSettingsPreparer.prepareSettings(DefaultSettingsPreparer.java:36)
        at org.gradle.initialization.NotifyingSettingsPreparer$LoadBuild.doLoadBuild(NotifyingSettingsPreparer.java:59)
        at org.gradle.initialization.NotifyingSettingsPreparer$LoadBuild.run(NotifyingSettingsPreparer.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.initialization.NotifyingSettingsPreparer.prepareSettings(NotifyingSettingsPreparer.java:42)
        at org.gradle.initialization.DefaultGradleLauncher.prepareSettings(DefaultGradleLauncher.java:189)
        at org.gradle.initialization.DefaultGradleLauncher.doClassicBuildStages(DefaultGradleLauncher.java:133)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:125)
        at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:105)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:58)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:55)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:82)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:75)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
        at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:75)
        at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:55)
        at org.gradle.initialization.buildsrc.BuildSrcUpdateFactory.build(BuildSrcUpdateFactory.java:55)
        at org.gradle.initialization.buildsrc.BuildSrcUpdateFactory.create(BuildSrcUpdateFactory.java:45)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder$3.transform(BuildSourceBuilder.java:124)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder$3.transform(BuildSourceBuilder.java:118)
        at org.gradle.composite.internal.DefaultNestedBuild.run(DefaultNestedBuild.java:73)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder.buildBuildSrc(BuildSourceBuilder.java:118)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder.access$000(BuildSourceBuilder.java:45)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder$2.call(BuildSourceBuilder.java:96)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder$2.call(BuildSourceBuilder.java:93)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder.createBuildSourceClasspath(BuildSourceBuilder.java:93)
        at org.gradle.initialization.buildsrc.BuildSourceBuilder.buildAndCreateClassLoader(BuildSourceBuilder.java:73)
        at org.gradle.initialization.DefaultSettingsLoader.findSettingsAndLoadIfAppropriate(DefaultSettingsLoader.java:102)
        at org.gradle.initialization.DefaultSettingsLoader.findAndLoadSettings(DefaultSettingsLoader.java:45)
        at org.gradle.initialization.SettingsAttachingSettingsLoader.findAndLoadSettings(SettingsAttachingSettingsLoader.java:35)
        at org.gradle.internal.composite.CommandLineIncludedBuildSettingsLoader.findAndLoadSettings(CommandLineIncludedBuildSettingsLoader.java:34)
        at org.gradle.internal.composite.ChildBuildRegisteringSettingsLoader.findAndLoadSettings(ChildBuildRegisteringSettingsLoader.java:47)
        at org.gradle.internal.composite.CompositeBuildSettingsLoader.findAndLoadSettings(CompositeBuildSettingsLoader.java:35)
        at org.gradle.initialization.DefaultSettingsPreparer.prepareSettings(DefaultSettingsPreparer.java:36)
        at org.gradle.initialization.NotifyingSettingsPreparer$LoadBuild.doLoadBuild(NotifyingSettingsPreparer.java:59)
        at org.gradle.initialization.NotifyingSettingsPreparer$LoadBuild.run(NotifyingSettingsPreparer.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:402)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:394)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:92)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.run(DelegatingBuildOperationExecutor.java:31)
        at org.gradle.initialization.NotifyingSettingsPreparer.prepareSettings(NotifyingSettingsPreparer.java:42)
        at org.gradle.initialization.DefaultGradleLauncher.prepareSettings(DefaultGradleLauncher.java:189)
        at org.gradle.initialization.DefaultGradleLauncher.doClassicBuildStages(DefaultGradleLauncher.java:133)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:125)
        at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultGradleLauncher.java:105)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:58)
        at org.gradle.internal.invocation.GradleBuildController$1.execute(GradleBuildController.java:55)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:82)
        at org.gradle.internal.invocation.GradleBuildController$3.create(GradleBuildController.java:75)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultWorkerLeaseService.java:183)
        at org.gradle.internal.work.StopShieldingWorkerLeaseService.withLocks(StopShieldingWorkerLeaseService.java:40)
        at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBuildController.java:75)
        at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildController.java:55)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:31)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.launcher.exec.BuildOutcomeReportingBuildActionRunner.run(BuildOutcomeReportingBuildActionRunner.java:58)
        at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(ValidatingBuildActionRunner.java:32)
        at org.gradle.launcher.exec.BuildCompletionNotifyingBuildActionRunner.run(BuildCompletionNotifyingBuildActionRunner.java:39)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(RunAsBuildOperationBuildActionRunner.java:51)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(RunAsBuildOperationBuildActionRunner.java:45)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:416)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$CallableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:406)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor$1.execute(DefaultBuildOperationExecutor.java:165)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:250)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:158)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:102)
        at org.gradle.internal.operations.DelegatingBuildOperationExecutor.call(DelegatingBuildOperationExecutor.java:36)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:45)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:49)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$1.transform(InProcessBuildActionExecuter.java:46)
        at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBuildState.java:78)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:46)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:31)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:42)
        at org.gradle.launcher.exec.BuildTreeScopeBuildActionExecuter.execute(BuildTreeScopeBuildActionExecuter.java:28)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:78)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:52)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.execute(SubscribableBuildActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.execute(SubscribableBuildActionExecuter.java:36)
        at org.gradle.tooling.internal.provider.SessionScopeBuildActionExecuter.execute(SessionScopeBuildActionExecuter.java:68)
        at org.gradle.tooling.internal.provider.SessionScopeBuildActionExecuter.execute(SessionScopeBuildActionExecuter.java:38)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:37)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.execute(GradleThreadBuildActionExecuter.java:26)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:43)
        at org.gradle.tooling.internal.provider.ParallelismConfigurationBuildActionExecuter.execute(ParallelismConfigurationBuildActionExecuter.java:29)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:60)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecuter.execute(StartParamsValidatingActionExecuter.java:32)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:55)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExecuter.execute(SessionFailureReportingActionExecuter.java:41)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:48)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execute(SetupLoggingActionExecuter.java:32)
        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:55)
        at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:208)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:394)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:367)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:37)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:23)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:360)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:292)
        at org.gradle.launcher.Main.doAction(Main.java:36)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:565)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:60)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:37)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:565)
        at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:31)
        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:108)
        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)

FAILURE: Build failed with an exception.

* What went wrong:
Could not initialize class org.codehaus.groovy.reflection.ReflectionCache

This is broken in JDK14 b8.
This is a bug in groovy-git/src/main/org/codehaus/groovy/vmplugin/v7/Java7.java
It seems to be hacking one of Lookup's constructors. The constructor is private and does not exist in JDK 14 as we've refactored this area as part of the work to fix the issues teleporting with Lookup objects.
There is a try/catch block but it is catching a SecurityException. This type of error starting in JDK9 throws a new JDK9 runtime exception. To write portable code, you can't catch the exact exception but instead use catch (RuntimeException).

[kevinrushforth]

I note that the gradle doesn't work (at least not for Java projects) on JDK 13 either, due to #8681. That bug is currently targeted to gradle 6.0.

Yes, I already hacked a copy of gradle that replaces the asm class with a copy that does not check the class version number so I can continue to work on gradle 5.x.

We need to get out of the mode where we need a new version every 6 months.

1. Projects like Spring have simply removed the check from their repackaged ClassReader.

2 Eclipselink uses its own superclass of ClassReader that calls the protected API in ClassReader with a flag to bypass the check.

3. The latest HK2 removed its repackaged ASM so you can bring your own smarter ASM.

Pick an option as long as we get away from the 6-month cycle.

My preferred solution would be to have ASM visible in the JDK. There is a repackaged version of ASM in the JDK but it's not public.

[AlanBateman]

Same thing happens with the recently released Groovy 2.5.8:

$ groovy-2.5.8/bin/groovy hello.groovy 
java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.groovy.vmplugin.v7.Java7
	at org.codehaus.groovy.vmplugin.VMPluginFactory.<clinit>(VMPluginFactory.java:43)
	at org.codehaus.groovy.reflection.GroovyClassValueFactory.<clinit>(GroovyClassValueFactory.java:35)
:

With JDK 13, 12, 11, ... it seems to load org.codehaus.groovy.vmplugin.v9.Java9 but then loads org.codehaus.groovy.vmplugin.v7.Java7 where it tries to hack into one of Lookup's private constructors. That causes a warning at run-time. The constructor doesn't exist in JDK 14 so the hack fails.

[AlanBateman]

GROOVY-9211

[aguibert]

Any update on this? I just tried with the latest Java 14 early access build (build 21) and with the latest Gradle RC (Gradle 6.0 RC2) and it is still failing with the same error.

Gradle is a great build tool, but if it doesn't keep pace with the Java version updates it is not even an option to use.