/**
* Copyright 2015 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS-IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.apphosting.tests.usercode.testservlets;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* This servlet tries to use reflection to access a private
* Sun class which implements a public, whitelisted interface.
*
*/
public class ReflectionServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException {
// This returns a private class, Collections$2.
Enumeration<?> e = Collections.enumeration(Collections.emptyList());
try {
// However, we should still be able to access the public
// Enumeration methods reflectively.
Method m = e.getClass().getMethod("hasMoreElements");
m.setAccessible(true);
Object result = m.invoke(e);
res.getWriter().println("hasMoreElements = " + result);
} catch (Exception ex) {
throw new ServletException(ex);
}
}
}