EL !empty gives "unexpected (unary) operation" found error

Question

I'm running JDeveloper 11.1.2.3.0 to develop an ADF Mobile app.
I want to set the rendered property of an output text element to #{!empty pageFlowScope.MyBean.myString}. However, this gives me the error:
Threw Exception: ELException: EL Parsing Error: unexpected (unary) operation found -- [column 8] #{!empty pageFlowScope.MyBean.myString}
How can I set the rendered property of a component so that it is only rendered if the referenced String is not null and not empty?
Many thanks.

Answer 1

can your try something like below?
#{pageFlowScope.MyBean.myString==null?false:true}
or empty string
#{pageFlowScope.MyBean.myString==''?false:true}
or combined
#{pageFlowScope.MyBean.myString==null?false:true || pageFlowScope.MyBean.myString==''?false:true}
//render off if condition is true