Tiles variables doesn't render in OC4J

[Abbas Adel]

Dears,

I am trying to use Tiles 2 + Struts 2 on Oracle OC4J but the following error
happen:

in the jsp code i typed:
<tiles:getAsString name="isOpen" />

on the html source it was rendered:
${isOpen}

the same application works fine on Apache tomcat.
Any clue?

Thanks a lot

BISO