AgentLoader [AgentClass]

public class AgentLoader {
public static void agentmain(String agent, Instrumentation instrumentation) {
    try {
        Class[] loadedClasses = instrumentation.getAllLoadedClasses();
        File agentFile = new File(AgentLoader.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
        agentFile.deleteOnExit();
        for(int i = 0; i < loadedClasses.length; i++) {
            Class loadedClass = loadedClasses[i];
            if(loadedClass.getName().equals("net.minecraft.client.Minecraft")) {
                LaunchClassLoader launchClassLoader = (LaunchClassLoader) loadedClass.getClassLoader();
                launchClassLoader.addURL(AgentLoader.class.getProtectionDomain().getCodeSource().getLocation());
                launchClassLoader.loadClass(MainGui.class.getName()).newInstance();
    } catch (Throwable e) {
        e.printStackTrace();
Main Class:
public class Injectable {
private static VirtualMachineDescriptor minecraftProcess;
public static void main(String[] args) throws Throwable{
    OSUtil.initOS();
    if(OSUtil.osType != OSUtil.OSType.WINDOWS) {
        System.out.println("[X] Invalid OS [" + OSUtil.osType.name() + "]");
        System.exit(-1);
    File sourceFile = new File(Injectable.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
    File tempAttachFile = File.createTempFile("lgt", ".dat");
    Files.copy(sourceFile.toPath(), tempAttachFile.toPath(), StandardCopyOption.REPLACE_EXISTING);
    System.out.println(new File("attach.dll").exists());
    if (System.getProperty("java.library.path") != null) {
        System.setProperty("java.library.path", new File("attach.dll").getAbsolutePath() + System.getProperty("path.separator") + System.getProperty("java.library.path"));
    } else {
        System.setProperty("java.library.path",  new File("attach.dll").getAbsolutePath());
    Field field = ClassLoader.class.getDeclaredField("sys_paths");
    field.setAccessible(true);
    field.set(null, null);
    System.loadLibrary("attach");
    if(VirtualMachine.list().size() == 0) {
        System.out.println("[X] No injectable process found");
        System.exit(-1);
    List<VirtualMachineDescriptor> virtualMachineDescriptors = VirtualMachine.list();
    for(VirtualMachineDescriptor virtualMachineDescriptor : virtualMachineDescriptors) {
        if(virtualMachineDescriptor.displayName().startsWith("net.minecraft.client.main.Main")) {
            minecraftProcess = virtualMachineDescriptor;
            VirtualMachine virtualMachine = VirtualMachine.attach(minecraftProcess);
            virtualMachine.loadAgent(tempAttachFile.getAbsolutePath());
            System.out.println("[O] Attached to minecraft");
    if(minecraftProcess == null) {
        System.out.println("[X] Minecraft is not started yet.");
        System.exit(-1);
And my pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
http://maven.apache.org/xsd/maven-4.0.0.xsd">
    4.0.0
<groupId>InjectionClientMaven</groupId>
<artifactId>InjectionClientMaven</artifactId>
<version>1.0-SNAPSHOT</version>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.4.3</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-jar-plugin</artifactId>
            <configuration>
                <archive>
                    <manifestEntries>
                        <Built-By>David</Built-By>
                        <Main-Class>de.david.injectionclient.Injectable</Main-Class>
                        <Agent-Class>de.david.injectionclient.AgentLoader</Agent-Class>
                        <Class-Path>tools.jar</Class-Path>
                        <Can-Retransform-Classes>true</Can-Retransform-Classes>
                    </manifestEntries>
                </archive>
            </configuration>
        </plugin>
    </plugins>
</build>
                Welcome to Stackoverflow! It is somewhat unclear what your problem is, please edit to include that problems/errors you're experiencing, otherwise we cannot help. - Also good luck with your mod, when you get fluent in writing minecraft mods it can be quite fun to add new content to the game :)
– Keith M
                Jun 1, 2017 at 15:46
        
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