Check empty string in jsp

Question

How to check for Empty String/Null String in Struts-JSP page.

Struts Tag - does not works?

Answer 1

See below:

<c:if test='${not empty param.whatever}'>
   ...
</c:if>

Answer 2

<logic:empty param="<%= yourString %>">

or if the string you want to check is a property of a bean :

<logic:empty name="yourBean" property="yourBeanStringProperty">

Answer 3

String foo = null;
if(foo == null or foo.length() ==0) // The string is null