Tomcat 7: Search results page blank

To reproduce:

• Install Tomcat 7 locally, and configure the Hippo Go Green website to run on it
• On the Go Green website, go to the Ducht website
• In the search field, enter the query "solar" (or just go to http://localhost:8080/site/nl/zoek?query=solar )
• The search result remains empty. Note that in the part to the right, the correct facets are shown, with the correct number of documents

On Tomcat 6, with exactly the same wars, jars and configuration, the search page works fine.

Attaching two screenshots: One made using Tomcat 7, the other with Tomcat 6.

From the log hippo-site.log:
01.12.2011 11:26:00 WARN [org.hippoecm.hst.core.container.HstComponentInvokerImpl.invokeRender():212] Component exception caught on window content with component com.onehippo.gogreen.components.search.SearchComponent: org.apache.jasper.JasperException: /WEB-INF/jsp/search/results.jsp (line: 83, column: 12) "${hit.class.simpleName}" contains invalid expression(s): javax.el.ELException: Failed to parse the expression [${hit.class.simpleName}] at org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:42)