JCH
Java Community | Help. Code. Learn.•22h ago
Potentiometer Annihilator

JNI IllegalAccessError

I am using JNI to call some static Java method from Rust side, but its throwing an java.lang.IllegalAccessError exception the code for calling the method is nothing special: 
    // 5. Start JVM
    let jvm = JavaVM::new(jvm_args)?;
    let mut env = jvm.attach_current_thread()?;

    println!("Calling: Bootstrap.initialize()");
    env.call_static_method("net/minecraft/Bootstrap", "initialize", "()V", &[])?;
    // 5. Start JVM
    let jvm = JavaVM::new(jvm_args)?;
    let mut env = jvm.attach_current_thread()?;

    println!("Calling: Bootstrap.initialize()");
    env.call_static_method("net/minecraft/Bootstrap", "initialize", "()V", &[])?;
It feels to me that the error have something to do with JVM/JNI and Java itself rather than the Rust library, I am super new to Java, so any help would be much appreciated, this is the full error (truncated): 
Calling: Bootstrap.initialize()
Exception in thread "Thread-0" java.lang.IllegalAccessError: class net.minecraft.registry.SimpleRegistry tried to access method 'void net.minecraft.registry.entry.RegistryEntry$Reference.setRegistryKey(net.minecraft.registry.RegistryKey)' (net.minecraft.registry.SimpleRegistry and net.minecraft.registry.entry.RegistryEntry$Reference are in unnamed module of loader 'app')
    at net.minecraft.registry.SimpleRegistry.add(SimpleRegistry.java:120)
    at net.minecraft.registry.SimpleDefaultedRegistry.add(SimpleDefaultedRegistry.java:23)
    at net.minecraft.registry.Registry.register(Registry.java:126)
    at net.minecraft.registry.Registry.register(Registry.java:122)
    at net.minecraft.registry.Registry.register(Registry.java:118)
    at net.minecraft.fluid.Fluids.register(Fluids.java:14)
    at net.minecraft.fluid.Fluids.<clinit>(Fluids.java:7)
    at net.minecraft.block.AbstractBlock$AbstractBlockState.<init>(AbstractBlock.java:851)
    at net.minecraft.block.BlockState.<init>(BlockState.java:17)
    at net.minecraft.state.StateManager.method_28484(StateManager.java:64)
    at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
    at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
    ...
Calling: Bootstrap.initialize()
Exception in thread "Thread-0" java.lang.IllegalAccessError: class net.minecraft.registry.SimpleRegistry tried to access method 'void net.minecraft.registry.entry.RegistryEntry$Reference.setRegistryKey(net.minecraft.registry.RegistryKey)' (net.minecraft.registry.SimpleRegistry and net.minecraft.registry.entry.RegistryEntry$Reference are in unnamed module of loader 'app')
    at net.minecraft.registry.SimpleRegistry.add(SimpleRegistry.java:120)
    at net.minecraft.registry.SimpleDefaultedRegistry.add(SimpleDefaultedRegistry.java:23)
    at net.minecraft.registry.Registry.register(Registry.java:126)
    at net.minecraft.registry.Registry.register(Registry.java:122)
    at net.minecraft.registry.Registry.register(Registry.java:118)
    at net.minecraft.fluid.Fluids.register(Fluids.java:14)
    at net.minecraft.fluid.Fluids.<clinit>(Fluids.java:7)
    at net.minecraft.block.AbstractBlock$AbstractBlockState.<init>(AbstractBlock.java:851)
    at net.minecraft.block.BlockState.<init>(BlockState.java:17)
    at net.minecraft.state.StateManager.method_28484(StateManager.java:64)
    at java.base/java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:411)
    at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
    ...
3 Replies
JavaBot
JavaBot•22h ago
⌛ This post has been reserved for your question.
Hey @Potentiometer Annihilator! Please use /close or the Close Post button above when your problem is solved. Please remember to follow the help guidelines. This post will be automatically marked as dormant after 300 minutes of inactivity.
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Noah | Nowipi
Noah | Nowipi•19h ago
def wrong rust lib usage did you write any Java code? FFM is the new way of connecting Java with native code btw
JavaBot
JavaBot•14h ago
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