HTTP Status 500 - java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl

Question

When I try to browse "localhost:8080" on myeclipse, I get the following error:

type Exception report

message java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl

description The server encountered an internal error that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:343)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)


root cause 

java.lang.NoClassDefFoundError: Could not initialize class org.apache.jasper.el.ELContextImpl
    org.apache.jasper.compiler.Validator$ValidateVisitor.prepareExpression(Validator.java:1568)
    org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:747)
    org.apache.jasper.compiler.Node$ELExpression.accept(Node.java:954)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
    org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
    org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
    org.apache.jasper.compiler.Node$Root.accept(Node.java:475)
    org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
    org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1795)
    org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:217)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:373)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
    org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)

Answer 1

Are you trying to run a Web app on Jetty server? The error NoClassDefFoundError means you do not have the jar file required to run that code.

Here is the stackoverflow question on the same issue.

org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.runtime.ELContextImpl

If you are using the Eclipse IDE, I recommend you to download the Eclipse Jetty plugin

https://code.google.com/p/run-jetty-run/

or in your eclipse under help -> Market place -> enter 'jetty' or 'jetty plugin' then download run-jetty-run plugin