test="${empty var1}">
var1 is empty or null.
test="${not empty var1}">
var1 is NOT empty or null.
or
test="${empty var1}">
var1 is empty or null.
var1 is NOT empty or null.
The
${not empty var1}
can also be done by ${!empty var1}
.
To learn more about those
${}
things (the Expression Language, which is a separate subject from JSTL),check here.
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