title: java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
body: <p>I'm developing a servlet that receives a multipart request with content of multiple files, and I'm using apache commons file upload libraries.</p>
  
  <p>When I call <code>parseRequest(request);</code> method servlet throws following exception:</p>
  
  <pre><code>GRAVE: Servlet.service() for servlet DiffOntology threw exception
  java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
      at org.apache.commons.fileupload.servlet.ServletRequestContext.getContentType(ServletRequestContext.java:73)
      at org.apache.commons.fileupload.FileUploadBase$FileItemIteratorImpl.&lt;init&gt;(FileUploadBase.java:882)
      at org.apache.commons.fileupload.FileUploadBase.getItemIterator(FileUploadBase.java:331)
      at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:349)
      at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
      at DiffOntology.doPost(DiffOntology.java:38)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:852)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
      at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
      at java.lang.Thread.run(Thread.java:619)
  </code></pre>
  
  <p>I put all libraries in WEB-INF/lib.</p>
  
  <p>EDIT:</p>
  
  <p>servlet-api.jar is in the correct directory (tomcat/lib) and all others libraries are in WEB-INF/lib</p>
  
  <p>I think maybe the problem could be the following:
  I'm developing this web project in Eclipse, and I imported file uploads libraries in the classpath.</p>
  
  <p>How it doesn't work?</p>
  
  <p>I'm desperate!!</p>