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Using tag library to check if  a object is null

Posted on 2004-04-08
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Last Modified: 2007-12-19
I would like to use the tag library to see if  the object is null.
The object is set in the session. In my JSP I get the object from the session.
The first thing i want to do is check if it is null- it it is nulll i print a message otherwise i go ahead and do some other stuff
this is what i have:
<logic:equal parameter="customers" value="null">  
      <B> Search string returned 0 records </B>
      </logic:equal>

<logic:notEqual parameter="customers" value="null">  
      //DO HTML STUFF
      </logic:notEqual>

I have a lot of HTML in my JSP - hece i did not use an if-else condition as it was tooconfusing.
Could someone help out with this or give me some info as to how i canuse if-else , i think i am messing up with the braces
thanks
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Question by:aswam1975
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2 Comments
 
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Expert Comment

by:searlas
ID: 10785189
use logic:present, not logic:equal

<logic:present parameter="customer">
<B> Search string returned 0 records </B>
</logic:present>

<logic:notPresent parameter="customers">  
     //DO HTML STUFF
</logic:notPresent>
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LVL 7

Accepted Solution

by:
searlas earned 30 total points
ID: 10785202
If you're really storing things in the session (which has nothing to do with parameter) then use logic:empty and logic:notEmpty

<logic:empty name="yourbean" scope="session">
...
</logic:empty>

and/or

<logic:empty name="yourbean" property="someprop" scope="session">
....
</logic:empty>
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