title: SEVERE: Servlet.service() for servlet jsp threw exception java.lang.LinkageError: loader constraint violation
body: <p>I'm working with Spring and trying to launch an application using tomcat 7, but I keep getting this error and I couldn't find much on Linkeage Errors in relation to Spring.</p>
  
  <p>Here is the full error:</p>
  
  <pre><code>Sep 24, 2013 7:54:15 PM org.apache.catalina.core.ApplicationDispatcher invoke
  SEVERE: Servlet.service() for servlet jsp threw exception
  java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.servlet.jsp.JspApplicationContext.getExpressionFactory()Ljavax/el/ExpressionFactory;" the class loader (instance of org/apache/jasper/servlet/JasperLoader) of the current class, org/apache/jsp/WEB_002dINF/views/home_jsp, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for resolved class, javax/servlet/jsp/JspApplicationContext, have different Class objects for the type avax/el/ExpressionFactory; used in the signature
      at org.apache.jsp.WEB_002dINF.views.home_jsp._jspInit(home_jsp.java:23)
      at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)
      at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:171)
      at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356)
      at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391)
      at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)
      at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:471)
      at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:402)
      at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
      at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:238)
      at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:262)
      at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1180)
      at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:950)
      at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
      at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
      at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
      at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:562)
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:395)
      at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:250)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188)
      at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:166)
      at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:302)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
      at java.lang.Thread.run(Thread.java:724)
  </code></pre>