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I was using Tomcat v8.0.15 on Eclipse Luna, it was working fine. Later, I installed Netbeans; which automatically installed another instance of Tomcat. I deleted one of them. In the result, tomcat stopped working on Eclipse; whenever I try to start tomcat, this error appears: 

Caused by: java.lang.NoClassDefFoundError: HttpServletRequest
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Class.java:2693)
    at java.lang.Class.getDeclaredMethods(Class.java:1967)
    at org.apache.catalina.util.Introspection.getDeclaredMethods(Introspection.java:127)
    at org.apache.catalina.startup.WebAnnotationSet.loadMethodsAnnotation(WebAnnotationSet.java:273)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:133)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:65)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:334)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:774)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5095)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 6 more
Caused by: java.lang.ClassNotFoundException: HttpServletRequest
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1295)
    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1147)
    ... 20 more
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  • It is not able to find the HttpServletRequest class. Sounds like your uninstallation probably removed some files that are still required by your working installation. The easiest thing to do might be to install tomcat from scratch. Commented Dec 27, 2014 at 1:38
  • Thanks buddy, I tried to install a fresh copy of Tomcat, and had the blank server name issue described in this link, I applied the solution available there. It worked for the installation but still having the same problem (Server Tomcat v8.0 Server at localhost failed to start; same console errors). Commented Dec 27, 2014 at 14:38

1 Answer 1

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So it happened to me just now and here is how I solved it: In the web.xml file I attempted to modify the servlet-name in my "servlet" tag from "DefaultServlet" to "DispatcherServlet", however the servlet-name in my "servlet-mapping" tag remained "DefaultServlet". All I had to do is to set the SAME servlet name (so "DispatcherServlet") for both "servlet" and "servlet-mapping" in their respective "servlet-name" tags. Once done it worked as a charm.

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