If else

[Mohit Anchlia]

I am struggling with a very simple question. How do I test if a
variable is defined or not?

I tried:


        <if>
          <matches string="${jboss.wily.jvmargs}" pattern="^[ \t]+" />

and


        <if>
          <matches string="${jboss.wily.jvmargs}" pattern="" />

and


        <if>
          <length string="${jboss.wily.jvmargs}" trim="true"
when="greater" length="0" />



Nothing seem to work. jboss.wily.jvmargs may or may not be there in
property file

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