Getting error when calling Java program from JSP page.

Hi All,
I'm getting below error msg, previously the page use to display and also java program use to run properly, but suddenly today i came across this error. May be some settings have been changed on my server, since number of developers uses this common webserver here.
Any help would be much appreciated. Pls let me know if if anyone requires much info regarding this one.
javax.servlet.ServletException: sun/tools/javac/Main
     at java.lang.Throwable.fillInStackTrace(Native Method)
     at java.lang.Throwable.fillInStackTrace(Compiled Code)
     at java.lang.Throwable.(Compiled Code)
     at java.lang.Exception.(Compiled Code)
     at javax.servlet.ServletException.(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.service(Compiled Code)
     at javax.servlet.http.HttpServlet.service(Compiled Code)
     at org.apache.tomcat.core.ServletWrapper.doService(Compiled Code)
     at org.apache.tomcat.core.Handler.service(Compiled Code)
     at org.apache.tomcat.core.ServletWrapper.service(Compiled Code)
     at org.apache.tomcat.facade.RequestDispatcherImpl.doForward
Root cause:
java.lang.NoClassDefFoundError: sun/tools/javac/Main
     at org.apache.jasper.compiler.SunJavaCompiler.compile(Compiled Code)
     at org.apache.jasper.compiler.Compiler.compile(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.doLoadJSP(Compiled Code)
     at org.apache.jasper.servlet.JasperLoader12.loadJSP(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.loadJSP(Compiled Code)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.loadIfNecessary(Compiled Code)
     at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(Compiled Code)
     at org.apache.jasper.servlet.JspServlet.service(Compiled Code)
Message was edited by:
shukla_arvind

did u happen to upgrade ur jdk?????

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