I downloaded Tomcat 5.0 and j2sdk1.4.2_05 and installed both of them on my system. Tomcat starts running properly and runs the index file. But when I try running some jsp pages in mondrian (Pentaho)I get the "org.apache.jasper.JasperException: Unable to compile class for JSP”: error. I have looked at all the pentaho forums and in Google and tried using the replies people have given. The java home path has been set properly and has also put the tools. Jar file into the common/lib folder of the tomcat server but the problem is still there.