[Pumpkins]

I made this about a year ago for my projects, decided to share it as I have a new one:
Note:
-any non-class resources have to be moved from embedded jar the wrappers jar with the same name/package (ie: dll files, images, etc) unless you want to fix the class path stuff. 🤝 Other than that it loads class files perfectly.

Usage:

Code

BCJInjector loader = new BCJInjector(mainclass, new ByteArrayInputStream(filebytes));
loader.startJar(args);

Class:

Code

package fuzzle;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;

/**
* Created by Pumpkins on 29/05/2015.
*
*/
public class BCJInjector extends ClassLoader {
    private Map<String, byte[]> classes = new HashMap<String, byte[]>();
    public String mainClass;
    private Method m;

    public BCJInjector(String main, InputStream in) {
        super(BCJInjector.class.getClassLoader());
        try {
            JarInputStream jis = new JarInputStream(in);

            mainClass = main;//jis.getManifest().getMainAttributes().getValue("Main-Class");
            JarEntry je = null;
            String entryName = null;
            while ((je = jis.getNextJarEntry()) != null) {
                entryName = je.getName();
                if (je.getName().endsWith(".class")) {
                    String canonicalName = entryName.replaceAll("/", ".").replaceAll(".class", "");
                    try {
                        byte[] classBytes = readClass(jis);
                        classes.put(canonicalName, classBytes);
                        /*if (!canonicalName.equals(mainClass)) { //This gets done later to extract methods.
                            resolveClass(defineClass(canonicalName, classBytes, 0, classBytes.length));
                        }*/
                    } catch (Exception e) {
                        System.out.println("Failed to dynamically map a class.");
                    } finally {
                        //System.out.println("Resolved & defined: " + canonicalName);
                    }

                }
            }
            jis.close();
            in.close();

        } catch (IOException e) {
            e.printStackTrace();
        }

        Class<?> tClass = null;
        try {
            tClass = loadClass(mainClass);
            m = tClass.getMethod("main", new Class[] { new String[] {}.getClass() });
            m.setAccessible(true);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }

    }

    public void startJar( String[] args ) throws ClassNotFoundException, IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException {
        int mods = m.getModifiers();
        if (m.getReturnType() != void.class || !Modifier.isStatic(mods) || !Modifier.isPublic(mods)) {
            throw new NoSuchMethodException("main");
        }
        try {
            m.invoke(null, new Object[] { args });
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }

    private byte[] readClass(InputStream stream) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        while(true){
            int qwe = stream.read();
            if(qwe == -1) break;
            baos.write(qwe);
        }
        return baos.toByteArray();
    }

    public Class loadClass(String name) throws ClassNotFoundException {
        try {
            return this.getParent().loadClass(name);
        } catch (ClassNotFoundException e) {
            return findClass(name);
        }
    }

    public Class findClass(String name) throws ClassNotFoundException {
        byte[] classBytes = classes.get(name);
        return defineClass(name, classBytes, 0, classBytes.length);
    }

}

[sweed]

please i want to buy your crypter but i can't contact here
please add me on skype: sweed.sweed7

[matt]

I made something like this a while back that instead loaded the class from a hard-coded byte array, it was pretty cool. :P
Thanks for sharing though, I always love to see contributions to the Java sub-forum! :-)

[Thepoeltje]

Pumpkins u should update people on Oscelestial you scamming people.