Java Community | Help. Code. Learn.•7d ago

Streaming jar in

Hey! so my minecraft mod has a loader as its a private mod. it recieves the b64 buffer of the jar file, then starts loading the classes. the thing is though it has errors for the minecraft classes, like: Caused by: java.lang.ClassNotFoundException: net.minecraft.class_2382 Any help would be appreciated!

18 Replies

JavaBot•7d ago

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cvs0OP•7d ago

message.txt

cvs0OP•7d ago

thats where we get the classes from the jar, and here is the custom class loader.

package cc.cnrm.loader.internal;

import java.util.Map;

public class CustomClassLoader extends ClassLoader {
    private final Map<String, byte[]> classes;

    public CustomClassLoader(ClassLoader parent, Map<String, byte[]> classes) {
        super(parent);
        this.classes = classes;
    }

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        Class<?> loadedClass = findLoadedClass(name);
        if (loadedClass == null) {
            byte[] classBytes = classes.get(name);
            if (classBytes != null) {
                return defineClass(name, classBytes, 0, classBytes.length);
            }
        }
        return super.findClass(name);
    }


    public Class<?> defineClass(String name, byte[] b) {
        return super.defineClass(name, b, 0, b.length);
    }
}

package cc.cnrm.loader.internal;

import java.util.Map;

public class CustomClassLoader extends ClassLoader {
    private final Map<String, byte[]> classes;

    public CustomClassLoader(ClassLoader parent, Map<String, byte[]> classes) {
        super(parent);
        this.classes = classes;
    }

    @Override
    protected Class<?> findClass(String name) throws ClassNotFoundException {
        Class<?> loadedClass = findLoadedClass(name);
        if (loadedClass == null) {
            byte[] classBytes = classes.get(name);
            if (classBytes != null) {
                return defineClass(name, classBytes, 0, classBytes.length);
            }
        }
        return super.findClass(name);
    }


    public Class<?> defineClass(String name, byte[] b) {
        return super.defineClass(name, b, 0, b.length);
    }
}

JavaBot•6d ago

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cvs0OP•6d ago

need help

0x150•6d ago

stacktrace of the error?

cvs0OP•6d ago

message.txt

0x150•6d ago

do you have any context around the code? some github repo i can look at? hard to diagnose what exactly is wrong without proper context

cvs0OP•6d ago

Its closed source, but it pretty much recieves the buffer of a jar, then just passes the bytes to that load method.

JavaBot•6d ago

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cvs0OP•6d ago

hey

dan1st•6d ago

you could try logging classes and name in findClass and ask yourself where the net.minecraft.class_2382 is supposed to be, what requires it and why you can still provide a minima reproducer

cvs0OP•6d ago

its a library that the jar references, so i dont think its bundled with it.

dan1st•6d ago

and where is that class located?

JavaBot•6d ago

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cvs0OP•6d ago

Well i mean thats just an internal minecraft class. we should be ignoring those when defining the classes i think

dan1st•5d ago

JavaBot•5d ago

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Streaming jar in

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