Using the NetBeans Platform on the Server with Wicket on the Client

package it.tidalwave.netbeans.servlet;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import org.openide.util.Lookup;

public class NetBeansPlatformDecoratorFilter implements Filter
  {
    private Filter delegate;
    
    public void init (final FilterConfig config)
      throws ServletException
      {
        try
          {
            NetBeansPlatformUtils.boot(config.getServletContext());
          }
        catch (Exception e)
          {
            throw new ServletException(e);
          }

        final ClassLoader classLoaderSave = NetBeansPlatformUtils.installPlatformClassLoader();

        try
          {
            final String className = config.getInitParameter("netbeans.filter.delegate");
            final Class delegateClass = Thread.currentThread().getContextClassLoader().loadClass(className);
            delegate = (Filter)Lookup.getDefault().lookup(delegateClass);

            if (delegate == null)
              {
                throw new RuntimeException("Can't lookup " + className);
              }

            delegate.init(config);
          }
        catch (Exception e)
          {
            throw new ServletException(e);
          }
        finally
          {
            Thread.currentThread().setContextClassLoader(classLoaderSave);
          }
      }

    public void doFilter (final ServletRequest request,
                          final ServletResponse response,
                          final FilterChain chain)
      throws IOException, ServletException
      {
        final ClassLoader classLoaderSave = NetBeansPlatformUtils.installPlatformClassLoader();

        try
          {
            delegate.doFilter(request, response, chain);
          }
        catch (Exception e)
          {
            throw new ServletException(e);
          }
        finally
          {
            Thread.currentThread().setContextClassLoader(classLoaderSave);
          }
      }

    public void destroy()
      {
        final ClassLoader classLoaderSave = NetBeansPlatformUtils.installPlatformClassLoader();

        try
          {
            delegate.destroy();
          }
        finally
          {
            Thread.currentThread().setContextClassLoader(classLoaderSave);
          }
      }
  }