I have this attribute in my h:commandButton
disabled="#{ not ( ( nodeChild.children == null or empty nodeChild.children ) and ( not setupManager.currentTerminals ) ) }"
If it renders disabled="false"
everything works but the other throws this exception
SEVERE: javax.faces.FacesException: java.lang.IllegalArgumentException: Cannot convert [] of type class java.util.ArrayList to class java.lang.Boolean
What is the best way of writing the above condition? Can I use the brackets?
The #{setupManager.currentTerminals}
is apparently returning an ArrayList
and thus the expression #{not setupManager.currentTerminals}
will fail because it's not a Boolean
. Use the not empty
instead of not
. Here's a rewrite (note that empty
covers null
as well, you don't need to do a nullcheck before).
disabled="#{not empty nodeChild.children and not empty setupManager.currentTerminals}"
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