title: java.lang.ClassNotFoundException: org.springframework.instrument.classloading.tomcat.TomcatInstrumentableClassLoader
body: <p>I am putting spring.jar file in my lib folder but still there is error like</p>
  
  <pre><code> at org.apache.jsp.index_jsp._jspInit(index_jsp.java:23)
   at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
   at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)
   at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
   at java.lang.Thread.run(Unknown Source)
  </code></pre>
  
  <p>and webpage give me error like</p>
  
  <blockquote>
    <p>HTTP Status 500 -</p>
  </blockquote>
  
  <p>How do I resolved it?</p>