个人中心
gpt4 book ai didi

启动tomcat加载servlet时出现java.lang.ClassCastException

转载 作者：行者123 更新时间：2023-11-28 23:46:24 24 4
gpt4 key购买 nike

当尝试从 SWT 应用程序中启动嵌入式 tomcat 网络应用程序时，出现错误(下面的堆栈跟踪):

java.lang.ClassCastException: org.apache.struts.action.ActionServlet和 java.lang.ClassCastException: org.apache.jasper.servlet.JspServlet

我搜索了 /lib/ 目录和 /WEB-INF/lib 目录中的所有 jar，但没有发现任何对任何 Servlet 的重复引用类。

应用程序使用 Tomcat 6.0.36 和 Struts 1.3.10

应用程序源代码构建和编译成功，没有错误。

\lib 中的 Jar 文件

lib\annotations-api.jar
lib\axis\axis-ant.jar
lib\axis\axis.jar
lib\axis\commons-discovery-0.2.jar
lib\axis\jaxrpc.jar
lib\axis\junit.jar
lib\axis\saaj.jar
lib\axis\wsdl4j-1.5.1.jar
lib\catalina.jar
lib\com.dom.jsso.common-server.jar
lib\commons-dbcp-1.2.1.jar
lib\commons-logging-1.1.jar
lib\commons-pool.jar
lib\derby.jar
lib\derbytools.jar
lib\dom4j.jar
lib\ehcache-1.1.jar
lib\el-api.jar
lib\hibernate3.jar
lib\jasper.jar
lib\jsp-api.jar
lib\jta.jar
lib\odmg.jar
lib\org.springframework.asm-3.1.3.RELEASE.jar
lib\org.springframework.beans-3.1.3.RELEASE.jar
lib\org.springframework.context-3.1.3.RELEASE.jar
lib\org.springframework.core-3.1.3.RELEASE.jar
lib\org.springframework.web-3.1.3.RELEASE.jar
lib\org.springframework.web.struts-3.1.3.RELEASE.jar
lib\servlet-api.jar
lib\tomcat-coyote.jar
lib\tomcat-dbcp.jar
lib\tomcat-juli.jar
lib\tools\ojdbc14.jar

项目中使用的其他jar(用于JFace和SWT)

eclipse\plugins\org.eclipse.jface_3.7.0.v20110928-1505.jar
eclipse\plugins\org.eclipse.jface.text_3.7.2.v20111213-1208.jar
eclipse\plugins\org.eclipse.swt_3.7.2.v3740f.jar
eclipse\plugins\org.eclipse.swt.win32.win32.x86_3.7.2.v3740f.jar

jar文件在tomcat\webapps\ \WEB-INF\lib 

WEB-INF\lib\antlr-2.7.2.jar
WEB-INF\lib\commons-beanutils-1.8.0.jar
WEB-INF\lib\commons-digester-1.8.jar
WEB-INF\lib\commons-fileupload-1.1.1.jar
WEB-INF\lib\commons-validator-1.3.1.jar
WEB-INF\lib\oro-2.0.8.jar
WEB-INF\lib\struts-core-1.3.10.jar
WEB-INF\lib\struts-taglib-1.3.10.jar

tomcat/conf/web.xml 的 servlet 部分

<servlet>
    <servlet-name>jsp</servlet-name>
    <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
    <init-param>
        <param-name>fork</param-name>
        <param-value>false</param-value>
    </init-param>
    <init-param>
        <param-name>xpoweredBy</param-name>
        <param-value>false</param-value>
    </init-param>
    <load-on-startup>3</load-on-startup>
</servlet>

web.xml 的 servlet 部分

<servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml,/WEB-INF/struts-config-adm.xml,/WEB-INF/struts-config-ajax.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>2</param-value>
        </init-param>
        <init-param>
            <param-name>detail</param-name>
            <param-value>2</param-value>
        </init-param>
        <load-on-startup>2</load-on-startup>
    </servlet>

错误堆栈跟踪:

Dec 7, 2012 1:46:08 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFO: Loading XML bean definitions from file [C:\projects\JSSO\com\example\conf\config.xml]
Dec 7, 2012 1:46:08 PM com.example.tomcat.embeddedTomcat init
INFO: Starting the tomcat bean
Dec 7, 2012 1:46:09 PM org.apache.catalina.startup.Embedded start
INFO: Starting tomcat server
Dec 7, 2012 1:46:09 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/6.0.36
Dec 7, 2012 1:46:10 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet action as unavailable
Dec 7, 2012 1:46:10 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet / threw load() exception
java.lang.ClassCastException: org.apache.struts.action.ActionServlet
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1149)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.startup.Embedded.start(Embedded.java:825)
    at com.example.tomcat.embeddedTomcat.init(embeddedTomcat.java:111)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1581)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1522)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at com.example.util.ServiceLocator.getModuleManager(ServiceLocator.java:26)
    at com.example.SWTMain$2.run(SWTMain.java:136)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at com.example.SWTMain.waitUntilExit(SWTMain.java:283)
    at com.example.SWTMain.main(SWTMain.java:176)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at com.example.Main.invokeLoader(Main.java:138)
    at com.example.Main.main(Main.java:123)
Dec 7, 2012 1:46:10 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet jsp as unavailable
Dec 7, 2012 1:46:10 PM org.apache.catalina.core.StandardContext loadOnStartup
SEVERE: Servlet / threw load() exception
java.lang.ClassCastException: org.apache.jasper.servlet.JspServlet
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1149)
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026)
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.startup.Embedded.start(Embedded.java:825)
    at com.example.tomcat.embeddedTomcat.init(embeddedTomcat.java:111)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1581)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1522)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at com.example.util.ServiceLocator.getModuleManager(ServiceLocator.java:26)
    at com.example.SWTMain$2.run(SWTMain.java:136)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at com.example.SWTMain.waitUntilExit(SWTMain.java:283)
    at com.example.SWTMain.main(SWTMain.java:176)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:585)
    at com.example.Main.invokeLoader(Main.java:138)
    at com.example.Main.main(Main.java:123)
Dec 7, 2012 1:46:10 PM org.apache.tomcat.util.modeler.Registry registerComponent
SEVERE: Null component null:type=JspMonitor,name=jsp,WebModule=//localhost/,J2EEApplication=none,J2EEServer=none
Dec 7, 2012 1:46:10 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8043
Dec 7, 2012 1:46:10 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8043
Dec 7, 2012 1:46:10 PM com.example.tomcat.embeddedTomcat init
INFO: Tomcat Started
Dec 7, 2012 1:46:11 PM org.apache.catalina.core.ApplicationDispatcher invoke
WARNING: Servlet jsp is currently unavailable
Dec 7, 2012 1:46:12 PM com.example.SWTMain$1 shellClosed
INFO: Closing the application
Dec 7, 2012 1:46:12 PM com.example.tomcat.embeddedTomcat shutdown
INFO: Shutting down tomcat
Dec 7, 2012 1:46:12 PM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8043

最佳答案

经过一些研究，你的类路径中有多个副本或版本的 struts，删除它们并只保留一个。虽然你说你检查过，但我找到的所有答案都指向这一点，所以你可能有但没有找到。

此外，尝试从 war 文件中删除 jar，因为它已经包含在内。

引用资料:

The struts.jar file should not be kept in a common area such as WAS/lib. It should be included in the WEB-INF/lib folder for each struts application.

http://www.coderanch.com/t/46849/Struts/Failed-load-servlet-Struts

Remove Struts core API jar from your war lib folder or from global commons lib directory. There are two jars of the same in two places, which gets loaded by different class loaders and hence casting is failing.

http://www.liferay.com/community/forums/-/message_boards/message/6813153

搜索包含类 org.apache.struts.action.ActionServlet 的确切 jar

Struts does not support multiple servlet mappings to the same action servlet instance.

http://grokbase.com/t/struts/user/02bqqdrxjt/struts-1-1b2-and-sybase-easerver-4-1-0-jaguar

关于启动tomcat加载servlet时出现java.lang.ClassCastException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13769429/

24 4 0
文章推荐： java - tomcat 7访问映射驱动器
文章推荐： Tomcat 控制台日志从我的应用程序获取输出
文章推荐： spring - Spring App 的自定义 tomcat context.xml
文章推荐： tomcat - 尝试在 Tomcat7 上使用 Wicket 实现 1.6 EventBus
行者123
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com