CODEWITHSUNDEEP
javahtmlperformancejspscriptlet
anL
anL

Reputation: 1073

JSP - Scriptlet performance with high amount of HTML code

I have a JSP contains high amount of HTML code. There are many inner divs, spans and h2 tags. The HTML code is generated by scriplets using some for loops.

I measure the scriptlet process by using the following :

   <% long time = System.currentTimeMillis(); %>
     // here is the entire page data
   <% System.out.println("Time : " + (System.currentTimeMillis()-time)); %>

According to this measurement, the process time is 300-350 msecs.

To spot the parts that make the delay, I did something like that :

    <% long time = System.currentTimeMillis(); %>
         // Some HTML Blocks
    <% System.out.println("Time1 : " + (System.currentTimeMillis()-time)); %>
         // Another HTML Blocks
    <% System.out.println("Time2 : " + (System.currentTimeMillis()-time)); %>

However, I realised that sometimes even if I do the following, even there is no html block between printlns, the time value is still changes !

   <% long time = System.currentTimeMillis(); %>
             // Some Blocks
   <% System.out.println("Time1 : " + (System.currentTimeMillis()-time)); %>
   <% System.out.println("Time2 : " + (System.currentTimeMillis()-time)); %>

Output is : 

Time1 : 65
Time2 : 208

So what is the thing that slow down my page ? How can I detect the point?

Do the Scriptlets have performance weakness for processing heavy HTML codes?

----- UPDATE ------

enter image description here

Here is the output : 

 first : 0
 Sec : 0
 thr : 0
 fr : 180
 Total : 180

There is nothing between thr and fr but fr value is 180 !

Upvotes: 2

Views: 1255

Answers (1)

Christopher Schneider
Christopher Schneider

Reputation: 3915

JSPs are java classes underneath. There shouldn't be any performance impact. Scriptlets are bad practice though, so unless this is just for benchmarking purposes, I wouldn't do it.

There are overhead costs when printing to the console as well. So when you're calculating:

<% System.out.println("Time2 : " + (System.currentTimeMillis()-time)); %>

You're adding all the time it takes to make the println call. If you want a more accurate reading, you should be doing this instead:

<% long time2 = System.currentTimeMillis(); %>

Only calculate the time at the very end of your JSP. Do not calculate/print results in the middle of the JSP as you'll see invalid results.

As an aside, I see you say you're using for loops. You should look at the JSTL core library: https://docs.oracle.com/javaee/5/jstl/1.1/docs/tlddocs/c/tld-summary.html

Upvotes: 1

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