Re: java.lang.ClassCastException: org.apache.tomcat.SimpleInstanceManager cannot be cast to org.apache.tomcat.InstanceManager

We struggled a long time with this too. This workaround "fixed" it for me:

https://stackoverflow.com/questions/41939509/org-apache-tomcat-simpleinstancemanager-cannot-be-cast-to-org-apache-tomcat-inst/44682480#44682480

On Monday, May 22, 2017 at 8:30:36 PM UTC+2, petere...@gmail.com wrote:

I am seeing the same exception - I am testing the upgrade from GWT 2.6.1 to 2.8.1.

I have a Web Application configured in Eclipse (Luna) to run DevMode - this same configuration worked under V2.6.1.

If I deploy the war file I build with the new GWT libraries under Tomcat, I do not have a problem. It is only when I'm trying launching thru Eclipse.

On Tuesday, February 7, 2017 at 11:29:42 AM UTC-5, ca...@linxa.com wrote:

I am trying to compile an application with Eclipse using GWT Plugin and when I try to display the application from browser It throws the following exception.

I could not find any way to make it work. Any help would be appreciated.

org.apache.jasper.JasperException: java.lang.ClassCastException: org.apache.tomcat.SimpleInstanceManager cannot be cast to org.apache.tomcat.InstanceManager

at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:585)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:396)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:405)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)

at org.eclipse.jetty.jsp.JettyJspServlet.service(JettyJspServlet.java:107)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)

at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)

at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)

at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)

at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

at org.eclipse.jetty.server.Server.handle(Server.java:499)

at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)

at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)

at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)

at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)

at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)

at java.lang.Thread.run(Thread.java:745)

Caused by: 

java.lang.ClassCastException: org.apache.tomcat.SimpleInstanceManager cannot be cast to org.apache.tomcat.InstanceManager

at org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(InstanceManagerFactory.java:29)

at org.apache.jsp.index_jsp._jspInit(index_jsp.java:32)

at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:49)

at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:180)

at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369)

at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:405)

at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)

at org.eclipse.jetty.jsp.JettyJspServlet.service(JettyJspServlet.java:107)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:812)

at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)

at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)

at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)

at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127)

at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515)

at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)

at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061)

at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

at org.eclipse.jetty.server.handler.RequestLogHandler.handle(RequestLogHandler.java:95)

at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)

at org.eclipse.jetty.server.Server.handle(Server.java:499)

at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311)

at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257)

at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544)

at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635)

at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555)

at java.lang.Thread.run(Thread.java:745)

[ERROR] 500 - GET /index.jsp (127.0.0.1)

   Request headers

      Host: 127.0.0.1:8888

      Connection: keep-alive

      Cache-Control: max-age=0

      Upgrade-Insecure-Requests: 1

      User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.95 Safari/537.36

      Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8

      Accept-Encoding: gzip, deflate, sdch, br

      Accept-Language: en-US,en;q=0.8,tr;q=0.6

      Cookie: JSESSIONID=m6qst2kzugik1gjjclf2y4lb1

   Response headers

      Date: Tue, 07 Feb 2017 11:59:39 GMT

      Connection: close

      Accept-Ranges: bytes

      Content-Type: text/html

      Last-Modified: Fri, 12 Apr 2013 08:27:21 GMT

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