When excuting from eclipse

I have problems compiling a jsp :

org.apache.jasper.JasperException: Unable to compile

class for JSPerror: Invalid class file format in

C:j2sdk1.4.0jrelib
t.jar

(java/lang/Object.class). The major.minor version '48.0' is

too recent for this tool to understand.

However i dont get the above problem when i run from console

Thanks