EL! vacuum gives "unexpected (unary) use" error

I'm under JDeveloper 11.1.2.3.0 to develop a Mobile application of the ADF.

I want to put the rendered property of an element to output text to #{! empty pageFlowScope.MyBean.myString}. However, it gives me the error:

The exception: ELException: EL Parsing Error: unexpected operation (unary) found-[column 8] #{! empty pageFlowScope.MyBean.myString}

How can I set the property made a component so that it is rendered only if the referenced string is not null and not empty?

Thank you very much.

NULL control does not seem to work, but looking for an empty as string above don't.

Thanks for your help.

Tags: Java

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