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Java ServiceLoader environment not finding services when running in Forge


MatrixShadow

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Hello,

I am working on a programming mod in Minecraft that is designed for coding Java, and I am using JShell to evaluate the statements. The issue happens when instantiating JShell with:

JShell.builder().build();

With the stack trace:

Caused by: java.lang.IllegalStateException: Launching JShell execution engine threw: No ExecutionControlProvider with name 'failover' and parameter keys: [0, 1, 2]
	at jdk.jshell.JShell.<init>(JShell.java:139) ~[jdk.jshell:?] {}
	at jdk.jshell.JShell$Builder.build(JShell.java:405) ~[jdk.jshell:?] {}
      ..
      ..

This is caused by the ServiceLoader not finding any ExecutionControlProviders. After looking into what a ServiceLoader is (https://www.logicbig.com/tutorials/core-java-tutorial/java-se-api/service-loader.html) and coming across this StackOverflow: (https://stackoverflow.com/questions/71023598/serviceloader-not-finding-any-services) I'm lead to believe that Forge or something to do with the minecraft development environment is not loading the same things as a default java environment (where I've done my testing this far)

(Below is the service loader screenshot, the IllegalArgumentException is thrown since there are no ExecutionControlProviders returned from the ServiceLoader.load(ExecutionControlProvider.class))

jshell-trace-source.png

 

I have tried an alternate way to load a class with 

ServiceLoader.load(ExecutionControlProvider.class, LaunchClassLoaderUtil.class.getClassLoader())
// also tried disabling my mixin annotation processor in build.gradle
//     annotationProcessor 'org.spongepowered:mixin:0.8.5:processor'

I'm not super familiar with how all this stuff is set up, and was wondering if anyone had any ideas or suggestions on how to get this working?

 

I've looked through a Minecraft JShell Plugin: (https://github.com/bramhaag/JShell/blob/cc2b8ae1191ab2e1b947a122430c586ed1c5ee81/src/main/java/me/bramhaag/jshell/JShellWrapper.java#L246 and https://www.spigotmc.org/resources/jshell.47753/) but there doesn't seem to be any special configuration there

 

Thanks for taking the time to read! Hopefully we can figure something out...

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