Java Servlet - Print to Eclipse console

Question

I'd like to test my servlet by printing the results to the console. System.out.println does not seen to work for a servlet. Does anyone know how I can achieve this? Main purpose is for debugging at a later stage.

public class GetAllStaff extends HttpServlet {

private static final long serialVersionUID = 1L;

static StaffDAO dao = new StaffDAO();
static ArrayList<Staff> sList = null;

public void doGet(HttpServletRequest request,
        HttpServletResponse response)
                throws ServletException, IOException {

    sList = dao.getAllStaff();

    for (int i = 0; i < sList.size(); i++)
    {

    }
  }

Why not just connect the debugger when you want to debug? Generally, you'd use a logger (like log4j, logback and/or slf4j) for logging. Also, because there could be multiple Servlet instances in the pool at runtime, is your dao thread safe? — Elliott Frisch
– Elliott Frisch, Commented Jan 2, 2016 at 18:40
@Elliot: That pool is only true when the servlet implements the since Servlet 2.4 (2003!) deprecated SingleThreadModel interface. Nonetheless, making it static is indeed fishy. — BalusC
– BalusC, Commented Jan 2, 2016 at 20:45

vivek_ganesan · Accepted Answer · 2016-01-02 18:45:08Z

1

You could use

ServletContext context = getServletContext( );
context.log("This is a log item");

The logs are not printed in Eclipse console but can be found at logs folder of servlet container (say Apache Tomcat)

Reference: http://www.tutorialspoint.com/servlets/servlets-debugging.htm

answered Jan 2, 2016 at 18:45

vivek_ganesan

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Bernhard Colby · Accepted Answer · 2016-01-02 20:34:09Z

0

You may want to print everything on a browser with the following code?

PrintWriter out = res.getWriter();
out.println("Some information on the browser...");

P.S I tried System.out.println("something"); in my IDE (Intellij), the result showed up in the console.

answered Jan 2, 2016 at 20:34

Bernhard Colby

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1 Comment

depperm Over a year ago

What is res (what is the type/instantiation)?

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