Question

I’m making a project on Google App Engine and in one of my jsp files, I want to search an entry in my datastore. I normally do this search by clicking on a button on this jsp page, then I make the connection to datastore in a servlet and then I send the query results to jsp back . Well, I want to query datastore without clicking this button. When I load the page, I want to see the query results on my page. When I was using EL tag lib, I could do that by just typing <% %>, now I’m using jstl tag lib. So is there any way to do ? After using jstl tags, I’m not able to use EL tags.

Answer 1

Well, I want to query datastore without clicking this button

Create a servlet which performs the job in doGet() method, forwards to a JSP which presents the result and just call the servlet’s URL instead of the JSP’s URL. It’s exactly the same as you would do in a doPost() when a form was submitted, but then without the need to pass/collect request parameters.

See also:

• Our Servlets wiki page – the 2nd Hello World example does exactly what you want.

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Unrelated to the concrete problem, those <% %> things ("scriptlets") have definitely nothing to do with EL. EL is those ${} things.

See also:

• Our JSTL wiki page
• Our EL wiki page