How to check if objects are not empty

Question

I'm trying to check if objects are not empty in a JSF 1.2 view. The expression is:

<h:panelGroup rendered="#{deuteBB.detallDeute.estatDomiciliacio ne empty and deuteBB.detallDeute.cccDomiciliacio ne empty}">

However, this did not work, neither with && instead of and. How is this caused and how can I solve it?

Answer 1

In your attempt you're basically comparing it to a variable with the name empty like so in "plain Java":

if (!deuteBB.getDetallDeute().getEstatDomiciliacio().equals(empty) && !deuteBB.getDetallDeute().getCcccDomiciliacio().equals(empty))

This is thus definitely not right. The right empty operator in EL is a prefix operator and should thus be used like so #{not empty bean.property}.

In your particular case, this should do:

<h:panelGroup rendered="#{not empty deuteBB.detallDeute.estatDomiciliacio and not empty deuteBB.detallDeute.cccDomiciliacio}">