InitializeH2Console.java

package net.gnehzr.tnoodle.server;

import java.lang.reflect.*;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

@SuppressWarnings("serial")
public class InitializeH2Console extends HttpServlet {
    private static final Logger l = Logger.getLogger(InitializeH2Console.class.getName());

    @Override
    public void init() throws ServletException {
        super.init();
        try {
            safeInit();
        } catch(Throwable t) {
            l.log(Level.SEVERE, "", t);
        }
    }

    private void safeInit() throws SecurityException, NoSuchFieldException, ClassNotFoundException, IllegalArgumentException, IllegalAccessException {
        // All this mess is to mutate the
        //  private static final String[] GENERIC = { ...
        // field in org.h2.server.web.WebServer
        // Shamelessly copied from http://stackoverflow.com/questions/3301635/change-private-static-final-field-using-java-reflection?answertab=votes#tab-top

        Class<?> webServer = Class.forName("org.h2.server.web.WebServer");

        Field genericField = webServer.getDeclaredField("GENERIC");
        Field modifiersField = Field.class.getDeclaredField("modifiers");
        modifiersField.setAccessible(true);
        modifiersField.setInt(genericField, genericField.getModifiers() & ~Modifier.FINAL);

        genericField.setAccessible(true);
        genericField.set(null, new String[] { "TNoodle H2 Database|javax.naming.InitialContext|java:comp/env/jdbc/connPool|root" });
    }

}