Posted July 27, 20214 yr Minecraft 1.17.1, Forge 37.0.2 I'm developing a custom language provider for Scala. I created the jar as the same way as 1.16.5, but Minecraft crashes with this error. Spoiler Exception in thread "main" java.lang.NullPointerException: Cannot invoke "net.minecraftforge.forgespi.language.IModFileInfo.moduleName()" because the return value of "net.minecraftforge.forgespi.locating.IModFile.getModFileInfo()" is null at MC-BOOTSTRAP/[email protected]/net.minecraftforge.fml.loading.moddiscovery.ModJarMetadata.name(ModJarMetadata.java:53) at [email protected]/cpw.mods.jarhandling.impl.Jar.name(Jar.java:212) at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948) 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.AbstractPipeline.evaluate(AbstractPipeline.java:550) at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260) at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616) at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:622) at java.base/java.util.stream.ReferencePipeline.toList(ReferencePipeline.java:627) at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.ModuleLayerHandler.buildLayer(ModuleLayerHandler.java:69) at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.ModuleLayerHandler.buildLayer(ModuleLayerHandler.java:82) at MC-BOOTSTRAP/[email protected]/cpw.mods.modlauncher.Launcher.run(Launcher.java:93) 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:84) NPE happens in the call of SecureJar#name, which calls JarMetadata#name. The default lang loaders(javafml, mclangage, etc.) is provided with SimpleJarMetadata or ModuleJarMetadata, where JarMetadata#name must return valid value. But jars in mods dir have ModJarMetadata. In the class, JarMetadata#name fails if modFile.getModFileInfo() is null. For mod jar(FMLModType is MOD), the field(modFile.modFileInfo) is set in construction but for LANGPROVIDER the field remains null. What I did Created a class that implements `IModLanguageProvider` Made a service provider file at META-INF/services/net.minecraftforge.forgespi.language.IModLanguageProvider It contains the class name that implements `net.minecraftforge.forgespi.language.IModLanguageProvider` Created other classes such as Mod Container, Language Target. Then, I made a jar file. Content of MANIFEST.MF in jar. I know "Main-Class" is not needed for Minecraft. It's for my test. I think "FMLModType" must be "LANGPROVIDER" if I want to create language provider, as the same way in 1.16.5. Spoiler Manifest-Version: 1.0 FMLModType: LANGPROVIDER Specification-Title: SLP Specification-Vendor: Kotori316 Specification-Version: 1 Implementation-Title: SLP Implementation-Version: 2.13.6-build-1 Implementation-Vendor: Kotori316 Implementation-Timestamp: 2021-07-27T15:07:10.803099700Z Main-Class: com.kotori316.scala_lib.Main EDIT: The PR https://github.com/MinecraftForge/MinecraftForge/pull/7947 will solve this problem. Edited July 30, 20214 yr by Kotori316
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