gknepper/MemoryStatus.java

## MemoryStatus.java
package com.testes;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class MemoryStatus
 */
@WebServlet("/MemoryStatus")
public class MemoryStatus extends HttpServlet {
	private static final long serialVersionUID = 1L;

    /**
     * @see HttpServlet#HttpServlet()
     */
    public MemoryStatus() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		Runtime instance = Runtime.getRuntime();
		int mb = 1024 * 1024;
		System.gc();

		response.getWriter().append("<HTML><BODY>");
		response.getWriter().append("<br>***** Heap utilization statistics [MB] after a forced GC*****<br>");
		response.getWriter().append("<br>Total Memory: " + instance.totalMemory() / mb + " mb");
		response.getWriter().append("<br>Free Memory: " + instance.freeMemory() / mb + " mb");
		response.getWriter().append("<br>Used Memory: " + (instance.totalMemory() - instance.freeMemory()) / mb + " mb");
		response.getWriter().append("<br>Max Memory: " + instance.maxMemory() / mb + " mb");
		response.getWriter().append("</HTML></BODY>");
	}

}
	package com.testes;

	import java.io.IOException;
	import javax.servlet.ServletException;
	import javax.servlet.annotation.WebServlet;
	import javax.servlet.http.HttpServlet;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;

	/**
	* Servlet implementation class MemoryStatus
	*/
	@WebServlet("/MemoryStatus")
	public class MemoryStatus extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	* @see HttpServlet#HttpServlet()
	*/
	public MemoryStatus() {
	super();
	// TODO Auto-generated constructor stub
	}

	/**
	* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	*/
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	// TODO Auto-generated method stub
	Runtime instance = Runtime.getRuntime();
	int mb = 1024 * 1024;
	System.gc();

	response.getWriter().append("<HTML><BODY>");
	response.getWriter().append("<br>*** Heap utilization statistics [MB] after a forced GC***<br>");
	response.getWriter().append("<br>Total Memory: " + instance.totalMemory() / mb + " mb");
	response.getWriter().append("<br>Free Memory: " + instance.freeMemory() / mb + " mb");
	response.getWriter().append("<br>Used Memory: " + (instance.totalMemory() - instance.freeMemory()) / mb + " mb");
	response.getWriter().append("<br>Max Memory: " + instance.maxMemory() / mb + " mb");
	response.getWriter().append("</HTML></BODY>");
	}

	}