birthdates/java-injector

Inject any JAR file into a running JVM

java-injector

Inject any JAR file into a running JVM.

How to Use

NOTE: This program will most likely trigger your anti-virus

1. Download the latest release or build it yourself (if you build it yourself, create a libs folder and move runner/Run.java into it)
2. Move all files into one folder
3. Compile your JAR and move it into the same folder but rename it to run.jar
4. Launch your Java application (javaw.exe application)
5. Run injector.exe and the JAR file should be injected into the JVM (if not, steps were not followed correctly)

How to Debug

You will need to build the program yourself. Head into shared.h and uncomment the line that looks like #define VERBOSE. After this, rebuild the project.

Creating JAR

When creating the JAR, include a resource run.txt with one line: the location of your main class.

Example:

com.example.ExampleRun

This class must have a empty void function main (this is the function that will first be called)

Example:

package com.example;

public class ExampleRun {
    public static void main() {
        System.out.println("Example injected.");
    }

}

NOTE: The example JAR provided in the releases will just close the application it injects into.

Common Problems

1. My Java code does not execute! - There is likely an error within your code, run the program in verbose mode.
2. Nothing injects (not even console) - There is likely another javaw.exe running.
3. ClassNotFoundException - The JVM you injected into does not have this class!
4. My prints aren't showing even in verbose mode! - Prints from other threads will not show up in verbose mode.