10.1.3 Production - Strange migration issues with OC4J

Hi,
first of all my congrats on another great release of my favorite Java IDE. Bad thing is I can't enjoy it as much as I want currently because of the following issue:
I'm working on a large project based on Struts, Tiles and Spring. The thing was born under 9.0.3 and happily survived several migrations since. It is running perfectly in 10.1.3 EA (OC4J and Tomcat 5.5). So I didn't expect any issues when switching to the production release. As I expected, everything worked without any errors. Fine. But then, when expectingly starting it in OC4J, things suddenly looked a bit different, for the login page came up somewhat naked. In fact, that is no wonder, as the app didn't find its CSS files, images, whatever. I import those resources (JSP 2.0) via the follówing line:
${pageContext.request.contextPath}/path_to_css.css
As it turned out, the pageContext thing wasn't resolved and so contextPath stays blank. Furthermore, the JSPs generated can't get access to session objects via expression language (eg. ${myBean.myAttribute}. JSTL <fmt:>, on the other hand, works wonderfully. Now for the odd part: if I change the JSP while the app is running and
then hit 'reload' to get it recompiled, the problem is gone. Looking at the .jsps sources, JDev generates something quite different from what OC4J does (the latter is the working version). I've spend the whole day now trying to find out why, including two fresh installs and setting up a test project, for I expected Tiles to be the culprit, but it's not; in fact, the issue also happens with a no-frills JSP page. Now I'm rather at the end of my knowledge. Has anyone had similar problems or knows how to resolve this issue? Any hint would be deeply appreciated :-)
-- Chris.
NB. My version is 10.1.3 J2EE (not Studio); I tried both the base one and later the complete version which comes with its own JDK.

Alas, talking to myself is fun, so I'll proceed. Today, I set up another simple test project (Servlets 2.4/JSP 2.0) with a JSP that just issues the following:
Context path: ${pageContext.request.contextPath}
Upon comparing what gets generated, I noticed the following differences:
1. What JDev generates and what does not work correctly:
javax.servlet.jsp.el.VariableResolver __ojsp_varRes = (VariableResolver)new OracleVariableResolverImpl(pageContext);
try {
out.write(__oracle_jsp_text[0]);
out.write(__oracle_jsp_text[1]);
catch( Throwable e) { .. }
2. The same fragment recompiled in OC4J:
javax.servlet.jsp.el.VariableResolver __ojsp_varRes = (VariableResolver)new OracleVariableResolverImpl(pageContext);
com.evermind.server.http.JspCommonExtraWriter __ojsp_s_out = (com.evermind.server.http.JspCommonExtraWriter) out;
try {
__ojsp_s_out.write(__oracle_jsp_text[0]);
out.write( (java.lang.String)oracle.jsp.runtime.OracleJspRuntime.evaluate("${pageContext.request.contextPath}",java.lang.String.class, __ojsp_varRes, null));
__ojsp_s_out.write(__oracle_jsp_text[1]);
catch( Throwable e) { .. }
As you can see, only the latter version contains code to evaluate the EL expression (the italic parts) at all! How on earth does this come from? Is there any switch in JDev to explicitly tell it to generate 2.0-compliant, EL-aware stuff apart from specifying 2.4 in the wizard?
-- Chris.

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