EDIT: Running 'gradlew runClient' directly in the terminal does not produce this issue, but using IntelliJ's normal Run button does.

 

When I try to use runClient or runServer, I get an error like this. Updating from Java 16 to 18 and restarting intelliJ seemed to fix the issue for runClient, but today I tried runServer again and now neither works anymore.

I'm modding on 1.19 with the latest mdk.

[15:22:27] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--launchTarget, forgeclientuserdev, --version, MOD_DEV, --assetIndex, 1.19, --assetsDir, C:\Users\Caspian\.gradle\caches\forge_gradle\assets, --gameDir, ., --fml.forgeVersion, 41.0.17, --fml.mcVersion, 1.19, --fml.forgeGroup, net.minecraftforge, --fml.mcpVersion, 20220607.102129]
Forge[15:22:27] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher 9.1.6+9.1.6+main.14b0cc03 starting: java version 16.0.2 by Oracle Corporation; OS Windows 10 arch amd64 version 10.0
ForgeException in thread "main" java.util.ServiceConfigurationError: cpw.mods.modlauncher.api.ILaunchHandlerService: Unable to load net.minecraftforge.fml.loading.targets.FMLClientLaunchHandler
	at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:582)
	at java.base/java.util.ServiceLoader.loadProvider(ServiceLoader.java:854)
	at java.base/java.util.ServiceLoader$LayerLookupIterator.hasNext(ServiceLoader.java:951)
	at java.base/java.util.ServiceLoader$ProviderSpliterator.tryAdvance(ServiceLoader.java:1481)
	at java.base/java.util.Spliterator.forEachRemaining(Spliterator.java:326)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.LaunchServiceHandler.<init>(LaunchServiceHandler.java:40)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.<init>(Launcher.java:53)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.main(Launcher.java:77)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26)
	at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23)
	at [email protected]/cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:149)
Caused by: java.lang.UnsupportedClassVersionError: net/minecraftforge/fml/loading/targets/FMLClientLaunchHandler has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 60.0
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1010)
	at [email protected]/cpw.mods.cl.ModuleClassLoader.readerToClass(ModuleClassLoader.java:116)
	at [email protected]/cpw.mods.cl.ModuleClassLoader.lambda$findClass$16(ModuleClassLoader.java:216)
	at [email protected]/cpw.mods.cl.ModuleClassLoader.loadFromModule(ModuleClassLoader.java:226)
	at [email protected]/cpw.mods.cl.ModuleClassLoader.findClass(ModuleClassLoader.java:216)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:631)
	at java.base/java.lang.Class.forName(Class.java:543)
	at java.base/java.util.ServiceLoader.loadProvider(ServiceLoader.java:852)
	... 14 more

Process finished with exit code 1

 

Edited June 12, 20223 yr by Syric

Minecraft 1.19 requires java 17

6 minutes ago, Luis_ST said:

Minecraft 1.19 requires java 17

...specifically? I have Java 18. I assumed 'Requires Java 17' meant '17 and up'.

Oh. That'd do it. I'll go see if I can fix that. Thank you!

I've solved the problem. For anyone else using IntelliJ, I had to go into File > Project Structure > SDKs and add Java 18, then Edit Run Configurations so that my runs used that SDK instead of the old one.