org.apache.catalina.core.DefaultInstanceManager cannot be cast to 【蕃薯耀】
org.apache.jasper.JasperException: java.lang.ClassCastException: org.apache.catalina.core.DefaultInstanceManager cannot be cast to org.apache.tomcat.InstanceManager
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页面错误：
HTTP Status 500 - type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception org.apache.jasper.JasperException: java.lang.ClassCastException: org.apache.catalina.core.DefaultInstanceManager cannot be cast to org.apache.tomcat.InstanceManager org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:168) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) root cause java.lang.ClassCastException: org.apache.catalina.core.DefaultInstanceManager cannot be cast to org.apache.tomcat.InstanceManager org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(InstanceManagerFactory.java:32) org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:161) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:356) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:391) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.11 logs. Apache Tomcat/7.0.11
Java控制台错误：
严重: Servlet.service() for servlet [jsp] in context with path [/servlet3] threw exception [java.lang.ClassCastException: org.apache.catalina.core.DefaultInstanceManager cannot be cast to org.apache.tomcat.InstanceManager] with root cause java.lang.ClassCastException: org.apache.catalina.core.DefaultInstanceManager cannot be cast to org.apache.tomcat.InstanceManager at org.apache.jasper.runtime.InstanceManagerFactory.getInstanceManager(InstanceManagerFactory.java:32) at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:161) 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.StandardWrapperValve.invoke(StandardWrapperValve.java:240) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498) 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:394) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:284) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:322) at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1714) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:619)
原因：
当项目中引用tomcat目录下面的lib下面的catalina.jar的时候，用myeclipse将项目部署到tomcat下面的时候，会将 catalina.jar包加到项目的web-inf下面的lib文件夹下面，这样这个包就会和tomcat下面的lib下面的catalina.jar 包冲突会报java.lang.ClassCastException: org.apache.catalina.util.DefaultAnnotationProcessor错误
解决方法：
修改了tomcat里的context.xml文件，
在context 元素下添加<Loader delegate="true" />
如下面所示：
<Context>
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts -->
<!--
<Manager pathname="" />
-->
<!-- Uncomment this to enable Comet connection tacking (provides events
on session expiration as well as webapp lifecycle) -->
<!--
<Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />
-->
<Loader delegate="true" />
</Context>
网上还有另一种解决方法：
将项目部署到tomcat下面后，将项目的web-inf/lib下面的catalina.jar删掉，然后在重启tomcat。
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蕃薯耀 2012年9月29日 01:23:28 星期六