Okaaaaay... After long debugging (the constant caching in the work/ directory was very misleading ;/) I found the reason of the error. The following part of web.xml was causing it:
<servlet>
|   <servlet-name>jsp</servlet-name>
|   <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
|    <init-param>
|     <param-name>compilerTargetVM</param-name>
|     <param-value>1.5</param-value>
|    </init-param>
|    <init-param>
|     <param-name>compilerSourceVM</param-name>
|     <param-value>1.5</param-value>
|    </init-param>
|  </servlet>
I found at the Tomcat forum that such configuration would allow to run JSP pages with Java 5 style (I wanted to use generic collections...). It successfully worked on Tomcat, but here I see it causes problems. The solution for that was to put the two init-params in the main server/xxx/deploy/jboss-web.deployer/conf/web.xml under the JSP servlet configuration (line 253). Phew... I hope it helps somebody in the future...

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