Thread: reg how to use log in jsp page

hi,
i m wrkng on web-application...in it i m wrkng with jsp,servlets,html pages....i was assigned to create logs...
with servlet i tried logs...its wrkng fine....the problem is how to write logs in jsp page...bcoz the proj. includes more of jsp pages....any one help me out...

thnxs,
Madhuri.

JSP page gets compiled down to a serverlet anyway so in princile its exactly the same.

Just remeber that to declare 'session' data you must use <?! ?>

Regards,
Chris

It will be really hard for you to log stuff in an html file but in your jsp file you can do something like this.

<%
    final Logger myLogger = new LoggerOrWhatever();
    myLogger.info("This is an INFO log message generated from the JSP");
%>

If you want to be slick you could however create your own little tag that would do the logging for you and then you could put something like this in your jsp file.

<mytaglib:logger>This is my log message which accepts el, just look at ${myvariable}</mytaglib:logger>

Oh and on another note, jsp's are not compiled into servlets, jsp are compiled into byte code by the application container and in tomcats case this is usally done by Jasper which is a JSP compiler.

In the standard setup of Tomcat there is a default web.xml for the server which has a servlet defined to handle jsp files so whenever you use a request dispatcher to forward a user to a jsp file it will be handled by the JSP servlet.

    <servlet>
        <servlet-name>jsp</servlet-name>
        <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
        <init-param>
            <param-name>fork</param-name>
            <param-value>false</param-value>
        </init-param>
        <init-param>
            <param-name>xpoweredBy</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>3</load-on-startup>
    </servlet>
 
    <servlet-mapping>
        <servlet-name>jsp</servlet-name>
        <url-pattern>*.jsp</url-pattern>
    </servlet-mapping>
 
    <servlet-mapping>
        <servlet-name>jsp</servlet-name>
        <url-pattern>*.jspx</url-pattern>
    </servlet-mapping>

// Json

From the reading I've recently done on JSP it was suggesting that depening on what server you are running it will with be compiled straight to byte code, or take an intermediate for of a servelet and then is compiled down from there.

But thanks for sharing your info Json

Chris

hi,
thanx for ur information....i tried it but im unable to wrk the program.....
can u provide me any example....
bye.

I just did provide you with two examples in the above post, what does your code look like?

What are you reading about JSP's atm Chris?

// Json

Just random stuff, i was just having a quikc look over them so I have a basic knowledge of what they do and how.

hi Json,
Gud mrng....thanx a lot....i tried wht u snd me the code.....its wrkng fine...once again thanx a lot.
Bye.