Tomcat error 500?

[Alex Kravets]

Just installed Apache and Tomcat. Everything seems to work ok, however I wanted to test out Tomcat and put a simple jsp file http://localhost:8080/jsp-examples/o.jsp and get this error:

[B]HTTP Status 500[/B]
 
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: -1 in the jsp file: null
Generated servlet error:
    [javac] Compiling 1 source file
C:\Program Files\Apache Software Foundation\Tomcat 5.0\work\Catalina\localhost\jsp-examples\org\apache\jsp\o_jsp.java:8: cannot access java.lang.Object
bad class file: C:\Program Files\Java\j2re1.4.2_03\lib\rt.jar(java/lang/Object.class)
class file has wrong version 48.0, should be 47.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
    implements org.apache.jasper.runtime.JspSourceDependent {
               ^
1 error

org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:127)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:351)
org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:415)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:458)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:553)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:291)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

What does this error mean? Do I need to reinstall my JDK?
thanks,
Alex

[Mike Curwen]

There are two problems:

j2re1.4.2_03

This is a JRE, not a JDK, so you (Tomcat) will not be able to compile JSP's. So alter JAVA_HOME to point to a JDK. If you've already installed Tomcat 5 as a Service, try uninstalling and re-installing, this time making sure Tomcat picks the JDK for JAVA_HOME.

the second problem is:
class file has wrong version 48.0, should be 47.0

I'm not sure of the exact reason, but this normally happens when people start mixing JDK 1.3 and JDK 1.4

[Alex Kravets]

thanks Mike,
but after reinstalling Tomcat and making sure I chose JDK directory, I got the same error -- it still says "bad class file: C:\Program Files\Java\j2re1.4.2_03\lib\rt.jar(java/lang/Object.class)." How can I change my JAVA_HOME for Tomcat manually?
thanks,
Alex