How do I enable EL evaluation in Weblogic 9.2?

We faced a problem while migrating from Tomcat to Weblogic 9.2. EL worked fine in Tomcat, but in Weblogic they are not recognized and evaluated, i.e. expression ${expr} appeares verbatim in html recieved by client.
We've explicitly enable EL evaluation by using page directive:
<%@ page isELIgnored ="false" %>
Do you have any ideas how to enable EL evaluation?

As I see Weblogic 9.2 doesn't implement correctly the following requirement from JSP 2.0 specification (JSP.1.10.1):
<br>
<br>
<i>A translation unit (JSP source file and any files included via the include
directive) can contain more than one instance of the page directive, all the
attributes will apply to the <b>complete</b> translation unit (i.e. page directives are
position independent).</i>
<br>
<br>
In my case <pre>page</pre> directive which enables EL evaluation is in the file which is included via <pre>include</pre> directive.

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