How can I check if a Resource Bundle contains a specific key in a JSF page -

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I have a JSF page in which a bundle is loaded. Although I need to dynamically create a key to use the property. What I need to do is check that the property exists, so I can decide whether to render or not.

I've checked that the value is empty, but it always gives output

Thank you

You can write a custom JSTL / Facet function which can be used for two arguments - Bundles and keys, and confirms that the key is contained or not: 

  value = "# {cust: containsKey (msg, key) • msg [key]: 'Default'} "

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