empty keyword in Struts

Is there an empty keyword in Struts 2 (like in JSP)?

For example in JSP I write:

<c:if test="${empty var}">

Thanks开发者_JAVA技巧

Just test for null.

And to acheive the same effect than the JSTL empty keyword with strings (which means "null or empty"), you need two checks (yes it is tiresome):

<s:if test="foo != null && foo != ''">