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Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You 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 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 org.apache.geronimo.samples.daytrader.web.prims;
 import  javax.servlet.*;
 import  javax.servlet.http.*;
ExplicitGC invokes System.gc(). This allows one to gather min / max heap statistics.
 public class ExplicitGC extends HttpServlet
 	private static String initTime;
 	private static int hitCount;

forwards post requests to the doGet method Creation date: (01/29/2006 20:10:00 PM)

res javax.servlet.http.HttpServletRequest
res2 javax.servlet.http.HttpServletResponse
 	public void doPost(HttpServletRequest req, HttpServletResponse res)
 		throws ServletException, IOException

this is the main method of the servlet that will service all get requests.

request HttpServletRequest
responce HttpServletResponce
 	public void doGet(HttpServletRequest req, HttpServletResponse res)
 		throws ServletException, IOException
 			ServletOutputStream out = res.getOutputStream();
              long totalMemory         = Runtime.getRuntime().totalMemory();
              long maxMemoryBeforeGC   = Runtime.getRuntime().maxMemory();
              long freeMemoryBeforeGC  = Runtime.getRuntime().freeMemory();
              long startTime           = System.currentTimeMillis();
              System.gc();  // Invoke the GC.
              long endTime            = System.currentTimeMillis();
              long maxMemoryAfterGC   = Runtime.getRuntime().maxMemory();
              long freeMemoryAfterGC  = Runtime.getRuntime().freeMemory();
 					+ "<body><HR><BR><FONT size=\"+2\" color=\"#000066\">Explicit Garbage Collection<BR></FONT><FONT size=\"+1\" color=\"#000066\">Init time : "
 					+ "<BR><BR></FONT>  <B>Hit Count: "
 					+ "<br>"
                      + "<table border=\"0\"><tr>"
 					+ "<td align=\"right\">Total Memory</td><td align=\"right\">" + totalMemory + "</td>"
                      + "</tr></table>"
                      + "<table width=\"350\"><tr><td colspan=\"2\" align=\"left\">"
 					+ "Statistics before GC</td></tr>"
                      + "<tr><td align=\"right\">"
 					+ "Max Memory</td><td align=\"right\">" + maxMemoryBeforeGC + "</td></tr>"
                     + "<tr><td align=\"right\">"
 					+ "Free Memory</td><td align=\"right\">" + freeMemoryBeforeGC + "</td></tr>"
                     + "<tr><td align=\"right\">"
 					+ "Used Memory</td><td align=\"right\">" + (totalMemory - freeMemoryBeforeGC) + "</td></tr>"
 					+ "<tr><td colspan=\"2\" align=\"left\">Statistics after GC</td></tr>"
                     + "<tr><td align=\"right\">"
 					+ "Max Memory</td><td align=\"right\">" + maxMemoryAfterGC + "</td></tr>"
                     + "<tr><td align=\"right\">"
 					+ "Free Memory</td><td align=\"right\">" + freeMemoryAfterGC + "</td></tr>"
                    + "<tr><td align=\"right\">"
"Used Memory</td><td align=\"right\">" + (totalMemory - freeMemoryAfterGC) + "</td></tr>"
                    + "<tr><td align=\"right\">"
"Total Time in GC</td><td align=\"right\">" + Float.toString((endTime - startTime) / 1000) + "s</td></tr>"
                     + "</table>"
		catch (Exception e)
			Log.error(e"ExplicitGC.doGet(...): general exception caught");
			res.sendError(500, e.toString());

returns a string of information about the servlet

info String: contains info about the servlet
		return "Generate Explicit GC to VM";
called when the class is loaded to initialize the servlet

config ServletConfig:
	public void init(ServletConfig configthrows ServletException
		 = 0;
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