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From "mgroovy (JIRA)" <>
Subject [jira] [Commented] (GROOVY-8385) CompileStatic: Improved method call/property access Java compatibility for Minecraft Forge obfuscation support
Date Sat, 09 Dec 2017 21:33:00 GMT


mgroovy commented on GROOVY-8385:

@[~blackdrag] (dev mailing list reply): Trying to access the field directly using
entity.@hurtResistantTime = 0
groovy.lang.MissingFieldException: No such field: hurtResistantTime for class: net.minecraft.entity.passive.EntityCow
	at groovy.lang.MetaClassImpl.setAttribute(
	at groovy.lang.MetaClassImpl.setAttribute(
	at org.codehaus.groovy.runtime.InvokerHelper.setAttribute(
	at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.setField(
	at com.elfmega.battleball.EntityFallingEnchantedBlock.attackEntity(EntityFallingEnchantedBlock.groovy:518)
	at com.elfmega.battleball.EntityFallingEnchantedBlock.func_70071_h_(EntityFallingEnchantedBlock.groovy:216)
	at net.minecraft.server.MinecraftServer.func_71190_q(
	at net.minecraft.server.MinecraftServer.func_71217_p(
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(
during Minecraft startup.

> CompileStatic: Improved method call/property access Java compatibility for Minecraft
Forge obfuscation support
> --------------------------------------------------------------------------------------------------------------
>                 Key: GROOVY-8385
>                 URL:
>             Project: Groovy
>          Issue Type: Improvement
>          Components: bytecode
>            Reporter: mgroovy
>            Priority: Minor
>              Labels: Forge, Java, JavaCompatibility, Minecraft, Modding
> * Even with @CompileStatic the Groovy compiler creates bytecode for method calls / property
access which is dynamic in nature. 
> * This means that e.g. Minecraft Forge's obfuscator does not pick up the calls in the
generated bytecode, which means they do not get obfuscated, which in turn makes the code fail
when executed in Minecraft.
> * This effectively makes it nearly impossible to write Minecraft mods with Groovy, which
in turn is a wasted opportunity to get people involved with Groovy early on.
> * Possible approaches to improve the situation:
> ## Improve on a fundamental level: According to [~paulk] only a few calls are required
to be done dynamically for Groovy functionality to work as expected under @CompileStatic.

> *** The problem seems to be that it could be hard to be a 100% sure no edge case is overlooked,
as to not break @CompileStatic in situations where e.g. no 100% Java-call-compatibility is
> ## Improve through newly introduced @CompileStatic parameters
> *** => Static method call / property access bytecode is generated for method code
/ all class methods repectively (with possible exceptions for the know cases mentioned above).
> ## Improve through newly introduced @ObfuscationJavaCompatibility annotation that can
be put on a method or class
> *** behavior same as for @CompileStatic parameters above

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