Java 17 compatibility

[keturn]

Edit: For those troubleshooting Java issues see also this page

Java 17 is the latest Long-Term Service release. Distributions are available from Adoptium as of September 22, 2021.

It is the first LTS release to have jpackage, the low-latency garbage collectors ZGC and Shenandoah, and maybe if we're lucky, the new foreign memory access API. Just to name a few things of potential interest to game development in addition to the other language niceties.

I thought it'd be good to have a tracking issue as a place to attract notes about problems that come up when people try using java 14, java 15, java 16, or java 17.

What you were trying to do

play (or develop) Terasology on the latest release of the JDK version ▁▁

What actually happened

As soon as I ▁(verb)▁ the ▁(noun)▁, Gooey Jr turned in to an ▁(animal)▁ and said: ▁▁▁▁▁▁▁▁

How to reproduce

• Step 1
• Step 2
• Step 3

Log details and game version

Computer details

[DarkWeird]

Yeah!
We many discussed about java projects on discord:
Panama(foreign memory access api)
ZDC(for using we can not compile, but run)

Jpackage - it is required modular java.
Seems, we cannot use it. We will cannot share jdk with launcher

[GIANTCRAB]

I'm not sure if I should create an issue or write a comment here. Let me know if you need more details.

What you were trying to do

I was trying to run Gradle Wrapper jar game with a complete blank installation (no modules).

What actually happened

It failed, throwing an error. This is related to the change in Java API Method FileSystems.newFileSystem between version 11 and 14.

How to reproduce

1. .\gradlew jar game
2. wait for compilation
3. error will throw up

Log details and game version

TeraEd VERSION: 3.3.0-SNAPSHOT

> Task :engine:compileJava
D:\GameDev\Terasology\engine\src\main\java\org\terasology\persistence\internal\AbstractStorageManager.java:126: error: reference to newFileSystem is ambiguous
            try (FileSystem chunkZip = FileSystems.newFileSystem(chunkPath, null)) {
                                                  ^
  both method newFileSystem(Path,ClassLoader) in FileSystems and method newFileSystem(Path,Map<String,?>) in FileSystems match
D:\GameDev\Terasology\engine\src\main\java\org\terasology\persistence\internal\SaveTransaction.java:430: error: reference to newFileSystem is ambiguous
                    try (FileSystem oldZip = FileSystems.newFileSystem(oldChunkZipPath, null)) {
                                                        ^
  both method newFileSystem(Path,ClassLoader) in FileSystems and method newFileSystem(Path,Map<String,?>) in FileSystems match
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
2 errors

> Task :engine:compileJava FAILED

FAILURE: Build failed with an exception.

Computer details

• Windows 10
• AdoptOpenJDK 14.0.2
• Branch: dev-develop
• Commit used f683f12

To fix this issue, I temporarily downgraded to version 11 of OpenJDK.

[skaldarnar]

Hi @GIANTCRAB and thanks for the report!

Your observation is right, the Java API changed between Java 11 and Java 14. This issue is meant to collect such issues so that we are able to upgrade to Java 14 (or newer) at some point.

To fix this issue, I temporarily downgraded to version 11 of OpenJDK.
Your temporary fix is actually what is required for building from source 😉

[keturn]

I see, Java 13 added new methods, so when we pass null it's ambiguous whether that's a null ClassLoader or a null something-else.

That's easy enough to make forward-compatible.

It's the sort of thing that it seems like we might be able to catch categorically with one of the static analysis tools, but I haven't found anything in IntelliJ or SpotBugs that looks like "show me things that are incompatible with a future JDK," so I guess try-it-and-see will be how we find these.

(I'm also surprised the code in question needs that method, but it wouldn't be the first time Java's file-handling stuff has surprised me.)

[keturn]

I tried and failed to run with the current release candidate for JDK 15.

OpenJDK 64-Bit Server VM warning: You have loaded library ~/IdeaProjects/Terasology/natives/linux/liblwjgl.so which might have disabled stack guard. The VM will try to fix the stack guard now.
It's highly recommended that you fix the library with 'execstack -c <libfile>', or link it with '-z noexecstack'.
java.lang.UnsatisfiedLinkError: ~/IdeaProjects/Terasology/natives/linux/liblwjgl64.so: ~/.jdks/openjdk-15+36-1562/lib/libjawt.so: version `SUNWprivate_1.1' not found (required by ~/IdeaProjects/Terasology/natives/linux/liblwjgl64.so)
	at java.base/jdk.internal.loader.NativeLibraries.load(Native Method)
	at java.base/jdk.internal.loader.NativeLibraries$NativeLibraryImpl.open(NativeLibraries.java:383)
	at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:227)
	at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:169)
	at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2407)
	at java.base/java.lang.Runtime.load0(Runtime.java:747)
	at java.base/java.lang.System.load(System.java:1857)
	at org.lwjgl.Sys$1.run(Sys.java:70)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:312)
	at org.lwjgl.Sys.doLoadLibrary(Sys.java:66)
	at org.lwjgl.Sys.loadLibrary(Sys.java:87)
	at org.lwjgl.Sys.<clinit>(Sys.java:117)
	at org.terasology.engine.internal.TimeLwjgl.<init>(TimeLwjgl.java:23)
	at org.terasology.engine.subsystem.lwjgl.LwjglTimer.preInitialise(LwjglTimer.java:36)
	at org.terasology.engine.TerasologyEngine.preInitSubsystems(TerasologyEngine.java:281)
	at org.terasology.engine.TerasologyEngine.initialize(TerasologyEngine.java:215)
	at org.terasology.engine.TerasologyEngine.run(TerasologyEngine.java:404)
	at org.terasology.engine.Terasology.main(Terasology.java:182)

I wonder if that will be fixed by #3969? Either through something LWJGL 3 deliberately does differently, or just as a by-product of creating a newer build of the .so.

[Cervator]

Thanks @keturn - interesting note 🤔

Will ping @DarkWeird here as an FYI - would indeed be interesting to see if LWJGL 3 will save us all.

[keturn]

JDK 16 is now in Release Candidate phase, with less than four weeks until its scheduled General Availability release date.

As far as we know, JDK 17 is still planned to arrive in September as the next release with long term support.

Java 17 doesn't sound like such a far-off distant thing anymore!

[keturn]

Java 16 / JDK 16 is out!

jpackage, Records, instanceof pattern matching.

Vector API and foreign memory access API are in incubation stages. At this point I'd be surprised if they're included as stable in 17. Those are interesting for gamedev so I would have liked to see them in this next Long-Term Service release, but not this time, I guess.

Not much newsworthy on 17 yet. Some stuff for macs probably. We'll see what else shows up in the next few months.

[keturn]

The first release candidate for Java 17 is out!

The schedule targets August 19th for the final release candidate,
and September 14th for the release to general availability.

Highlights from the release notes include:

• New macOS Rendering Pipeline (-Dsun.java2d.metal=true) and macOS/AArch64 Port
• Incubating features from Project Panama:
  • Vector API, jdk.incubator.vector
  • Foreign Function and Memory API, jdk.incubator.foreign an alternative to JNI and sun.misc.Unsafe

[Ln11211]

hello,
I was trying to setup my workspace with JDK 17 and I got the same error, here is what was shown on my cmd prompt...

        at org.gradle.cache.internal.DefaultCacheAccess.open(DefaultCacheAccess.
java:139)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(Defaul
tPersistentDirectoryStore.java:89)
        at org.gradle.cache.internal.DefaultPersistentDirectoryStore.open(Defaul
tPersistentDirectoryStore.java:43)
        at org.gradle.cache.internal.DefaultCacheFactory.doOpen(DefaultCacheFact
ory.java:103)
        at org.gradle.cache.internal.DefaultCacheFactory.open(DefaultCacheFactor
y.java:68)
        at org.gradle.cache.internal.DefaultCacheRepository$PersistentCacheBuild
er.open(DefaultCacheRepository.java:126)
        at org.gradle.groovy.scripts.internal.FileCacheBackedScriptClassCompiler
.compile(FileCacheBackedScriptClassCompiler.java:116)
        at org.gradle.groovy.scripts.internal.CrossBuildInMemoryCachingScriptCla
ssCache.getOrCompile(CrossBuildInMemoryCachingScriptClassCache.java:50)
        at org.gradle.groovy.scripts.internal.BuildScopeInMemoryCachingScriptCla
ssCompiler.compile(BuildScopeInMemoryCachingScriptClassCompiler.java:50)
        at org.gradle.groovy.scripts.DefaultScriptCompilerFactory$ScriptCompiler
Impl.compile(DefaultScriptCompilerFactory.java:49)
        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.
apply(DefaultScriptPluginFactory.java:125)
        at org.gradle.configuration.BuildOperationScriptPlugin$1.run(BuildOperat
ionScriptPlugin.java:65)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(
DefaultBuildOperationRunner.java:29)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(
DefaultBuildOperationRunner.java:26)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.run(Defaul
tBuildOperationRunner.java:56)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$r
un$1(DefaultBuildOperationExecutor.java:71)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWith
UnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(Defa
ultBuildOperationExecutor.java:71)
        at org.gradle.configuration.BuildOperationScriptPlugin.lambda$apply$0(Bu
ildOperationScriptPlugin.java:62)
        at org.gradle.configuration.internal.DefaultUserCodeApplicationContext.a
pply(DefaultUserCodeApplicationContext.java:43)
        at org.gradle.configuration.BuildOperationScriptPlugin.apply(BuildOperat
ionScriptPlugin.java:62)
        at org.gradle.initialization.ScriptEvaluatingSettingsProcessor.applySett
ingsScript(ScriptEvaluatingSettingsProcessor.java:74)
        at org.gradle.initialization.ScriptEvaluatingSettingsProcessor.process(S
criptEvaluatingSettingsProcessor.java:67)
        at org.gradle.initialization.SettingsEvaluatedCallbackFiringSettingsProc
essor.process(SettingsEvaluatedCallbackFiringSettingsProcessor.java:34)
        at org.gradle.initialization.RootBuildCacheControllerSettingsProcessor.p
rocess(RootBuildCacheControllerSettingsProcessor.java:47)
        at org.gradle.initialization.BuildOperationSettingsProcessor$2.call(Buil
dOperationSettingsProcessor.java:50)
        at org.gradle.initialization.BuildOperationSettingsProcessor$2.call(Buil
dOperationSettingsProcessor.java:47)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBu
ildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBu
ildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.call(Defau
ltBuildOperationRunner.java:62)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$c
all$2(DefaultBuildOperationExecutor.java:76)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWit
hUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(Def
aultBuildOperationExecutor.java:76)
        at org.gradle.initialization.BuildOperationSettingsProcessor.process(Bui
ldOperationSettingsProcessor.java:47)
        at org.gradle.initialization.DefaultSettingsLoader.findSettingsAndLoadIf
Appropriate(DefaultSettingsLoader.java:127)
        at org.gradle.initialization.DefaultSettingsLoader.findAndLoadSettings(D
efaultSettingsLoader.java:65)
        at org.gradle.initialization.SettingsAttachingSettingsLoader.findAndLoad
Settings(SettingsAttachingSettingsLoader.java:35)
        at org.gradle.internal.composite.CommandLineIncludedBuildSettingsLoader.
findAndLoadSettings(CommandLineIncludedBuildSettingsLoader.java:34)
        at org.gradle.internal.composite.ChildBuildRegisteringSettingsLoader.fin
dAndLoadSettings(ChildBuildRegisteringSettingsLoader.java:53)
        at org.gradle.internal.composite.CompositeBuildSettingsLoader.findAndLoa
dSettings(CompositeBuildSettingsLoader.java:35)
        at org.gradle.initialization.DefaultSettingsPreparer.prepareSettings(Def
aultSettingsPreparer.java:36)
        at org.gradle.initialization.BuildOperationFiringSettingsPreparer$LoadBu
ild.doLoadBuild(BuildOperationFiringSettingsPreparer.java:62)
        at org.gradle.initialization.BuildOperationFiringSettingsPreparer$LoadBu
ild.run(BuildOperationFiringSettingsPreparer.java:57)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(
DefaultBuildOperationRunner.java:29)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(
DefaultBuildOperationRunner.java:26)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.run(Defaul
tBuildOperationRunner.java:56)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$r
un$1(DefaultBuildOperationExecutor.java:71)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.runWith
UnmanagedSupport(UnmanagedBuildOperationWrapper.java:45)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(Defa
ultBuildOperationExecutor.java:71)
        at org.gradle.initialization.BuildOperationFiringSettingsPreparer.prepar
eSettings(BuildOperationFiringSettingsPreparer.java:45)
        at org.gradle.initialization.DefaultGradleLauncher.prepareSettings(Defau
ltGradleLauncher.java:218)
        at org.gradle.initialization.DefaultGradleLauncher.doClassicBuildStages(
DefaultGradleLauncher.java:159)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(Default
GradleLauncher.java:148)
        at org.gradle.initialization.DefaultGradleLauncher.executeTasks(DefaultG
radleLauncher.java:124)
        at org.gradle.internal.invocation.GradleBuildController$1.create(GradleB
uildController.java:72)
        at org.gradle.internal.invocation.GradleBuildController$1.create(GradleB
uildController.java:67)
        at org.gradle.internal.work.DefaultWorkerLeaseService.withLocks(DefaultW
orkerLeaseService.java:213)
        at org.gradle.internal.invocation.GradleBuildController.doBuild(GradleBu
ildController.java:67)
        at org.gradle.internal.invocation.GradleBuildController.run(GradleBuildC
ontroller.java:56)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(Exe
cuteBuildActionRunner.java:31)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildA
ctionRunner.java:35)
        at org.gradle.launcher.exec.BuildOutcomeReportingBuildActionRunner.run(B
uildOutcomeReportingBuildActionRunner.java:63)
        at org.gradle.tooling.internal.provider.ValidatingBuildActionRunner.run(
ValidatingBuildActionRunner.java:32)
        at org.gradle.tooling.internal.provider.FileSystemWatchingBuildActionRun
ner.run(FileSystemWatchingBuildActionRunner.java:77)
        at org.gradle.launcher.exec.BuildCompletionNotifyingBuildActionRunner.ru
n(BuildCompletionNotifyingBuildActionRunner.java:41)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(
RunAsBuildOperationBuildActionRunner.java:49)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner$3.call(
RunAsBuildOperationBuildActionRunner.java:44)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBu
ildOperationWorker.execute(DefaultBuildOperationRunner.java:200)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBu
ildOperationWorker.execute(DefaultBuildOperationRunner.java:195)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:75)
        at org.gradle.internal.operations.DefaultBuildOperationRunner$3.execute(
DefaultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:153)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(De
faultBuildOperationRunner.java:68)
        at org.gradle.internal.operations.DefaultBuildOperationRunner.call(Defau
ltBuildOperationRunner.java:62)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.lambda$c
all$2(DefaultBuildOperationExecutor.java:76)
        at org.gradle.internal.operations.UnmanagedBuildOperationWrapper.callWit
hUnmanagedSupport(UnmanagedBuildOperationWrapper.java:54)
        at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(Def
aultBuildOperationExecutor.java:76)
        at org.gradle.launcher.exec.RunAsBuildOperationBuildActionRunner.run(Run
AsBuildOperationBuildActionRunner.java:44)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.lambda$execute$
0(InProcessBuildActionExecuter.java:54)
        at org.gradle.composite.internal.DefaultRootBuildState.run(DefaultRootBu
ildState.java:86)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProce
ssBuildActionExecuter.java:53)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProce
ssBuildActionExecuter.java:29)
        at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.l
ambda$execute$0(BuildTreeScopeLifecycleBuildActionExecuter.java:33)
        at org.gradle.internal.buildtree.BuildTreeState.run(BuildTreeState.java:
49)
        at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.e
xecute(BuildTreeScopeLifecycleBuildActionExecuter.java:32)
        at org.gradle.launcher.exec.BuildTreeScopeLifecycleBuildActionExecuter.e
xecute(BuildTreeScopeLifecycleBuildActionExecuter.java:27)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.ex
ecute(ContinuousBuildActionExecuter.java:104)
        at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.ex
ecute(ContinuousBuildActionExecuter.java:55)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.
execute(SubscribableBuildActionExecuter.java:64)
        at org.gradle.tooling.internal.provider.SubscribableBuildActionExecuter.
execute(SubscribableBuildActionExecuter.java:37)
        at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildAction
Executer.lambda$execute$0(SessionScopeLifecycleBuildActionExecuter.java:54)
        at org.gradle.internal.session.BuildSessionState.run(BuildSessionState.j
ava:67)
        at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildAction
Executer.execute(SessionScopeLifecycleBuildActionExecuter.java:50)
        at org.gradle.tooling.internal.provider.SessionScopeLifecycleBuildAction
Executer.execute(SessionScopeLifecycleBuildActionExecuter.java:36)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.
execute(GradleThreadBuildActionExecuter.java:36)
        at org.gradle.tooling.internal.provider.GradleThreadBuildActionExecuter.
execute(GradleThreadBuildActionExecuter.java:25)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecu
ter.execute(StartParamsValidatingActionExecuter.java:59)
        at org.gradle.tooling.internal.provider.StartParamsValidatingActionExecu
ter.execute(StartParamsValidatingActionExecuter.java:31)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExe
cuter.execute(SessionFailureReportingActionExecuter.java:55)
        at org.gradle.tooling.internal.provider.SessionFailureReportingActionExe
cuter.execute(SessionFailureReportingActionExecuter.java:41)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execu
te(SetupLoggingActionExecuter.java:47)
        at org.gradle.tooling.internal.provider.SetupLoggingActionExecuter.execu
te(SetupLoggingActionExecuter.java:31)
        at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBu
ild.java:65)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(Build
CommandOnly.java:37)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(
WatchForDisconnection.java:39)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute
(ResetDeprecationLogger.java:29)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.
execute(RequestStopIfSingleUsedDaemon.java:35)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.create(Fo
rwardClientInput.java:78)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.create(Fo
rwardClientInput.java:75)
        at org.gradle.util.Swapper.swap(Swapper.java:38)
        at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(For
wardClientInput.java:75)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogA
ndCheckHealth.java:55)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClien
t.java:63)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(Build
CommandOnly.java:37)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBu
ild(EstablishBuildEnvironment.java:84)
        at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(Build
CommandOnly.java:37)
        at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(
DaemonCommandExecution.java:104)
        at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.
run(StartBuildOrRespondWithBusy.java:52)
        at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(Daemon
StateCoordinator.java:297)
        at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.
onExecute(ExecutorPolicy.java:64)
        at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecu
torImpl.java:48)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoo
lExecutor.java:1136)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPo
olExecutor.java:635)
        at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnabl
e.run(ThreadFactoryImpl.java:56)
        at java.base/java.lang.Thread.run(Thread.java:833)

  1 error


* 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

BUILD FAILED in 1s

C:\Users\user\IdeaProjects\Terasology> gradlew jar game was the cmd I executed...
I am planning to use JDK 13

---

Edit(skaldarnar): applied some markdown formatting to the original post for better readability