servlet spring-dispatcher 的 Servlet.init() 抛出异常 3答案

【问题标题】：Servlet.init() for servlet spring-dispatcher threw exception 3servlet spring-dispatcher 的 Servlet.init() 抛出异常 3
【发布时间】：2017-03-22 23:53:11
【问题描述】：

Web.xml

    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
    id="WebApp_ID" 
    version="3.0">
      <display-name>Project</display-name>

      <servlet>
        <servlet-name>spring-dispatcher</servlet-name>
          <servlet-class>
              org.springframework.web.servlet.DispatcherServlet
          </servlet-class>
      </servlet>
      <servlet-mapping>
          <servlet-name>spring-dispatcher</servlet-name>
          <url-pattern>/</url-pattern>
      </servlet-mapping>
      </web-app>

这是我的 spring-dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:beans="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XML-Schema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc 
       http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 

       <context:component-scan base-package="com.sample" />


       <bean id="viewResolver
       class=org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix">
         <value>/WEB-INF/</value>
         </property>
         <property name="suffix">
         <value>.jsp</value>
         </property>
       </bean>
</beans>

这是我的控制器 HelloController.java

    package com.sample;

    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.servlet.ModelAndView;

    @Controller
    public class HelloController {

            @RequestMapping("/welcome")
        public ModelAndView helloWorld(){

                ModelAndView model = new ModelAndView("Hellopage");
                model.addObject("message","welcome page");

                return model;

            }
    }

这是我的 JSP 页面 Hellopage.jsp

    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
    <title>Insert title here</title>
    </head>
    <body>
      <h1>${message}</h1>
    </body>
    </html>

例外

输入异常报告

servlet spring-dispatcher 的消息 Servlet.init() 抛出异常

描述服务器遇到了一个内部错误，导致它无法完成这个请求。

异常

javax.servlet.ServletException: Servlet.init() for servlet spring-dispatcher threw exception
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Unknown Source)



root cause 
org.springframework.beans.factory.xml.XmlBeanDefinitionStoreException: Line 13 in XML document from ServletContext resource [/WEB-INF/spring-dispatcher-servlet.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 13; columnNumber: 67; cvc-elt.1: Cannot find the declaration of element 'beans'.
    org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398)
    org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:335)
    org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:303)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:180)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:216)
    org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:187)
    org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:125)
    org.springframework.web.context.support.XmlWebApplicationContext.loadBeanDefinitions(XmlWebApplicationContext.java:94)
    org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:129)
    org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:540)
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:454)
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624)
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672)
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543)
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484)
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    javax.servlet.GenericServlet.init(GenericServlet.java:158)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    java.lang.Thread.run(Unknown Source)



root cause 
org.xml.sax.SAXParseException; lineNumber: 13; columnNumber: 67; cvc-elt.1: Cannot find the declaration of element 'beans'.
    com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)
    com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
    com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source

【问题讨论】：

标签： java spring-mvc servlets pom.xml

【解决方案1】：

试试这样：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns:beans="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XML-Schema-instance"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc 
       http://www.springframework.org/schema/mvc/spring-mvc.xsd"> 

       <context:component-scan base-package="com.sample" />


       <beans:bean id="viewResolver
       class=org.springframework.web.servlet.view.InternalResourceViewResolver">
         <beans:property name="prefix">
         <beans:value>/WEB-INF/</beans:value>
         </beans:property>
         <beans:property name="suffix">
         <beans:value>.jsp</beans:value>
         </beans:property>
       </beans:bean>
</beans:beans>

您将"http://www.springframework.org/schema/beans" 架构声明为xmlns:beans，因此您必须在任何bean 的架构元素之前使用beans: 前缀

编辑

您还错过了<beans:bean id="viewResolver 中id 属性之后的尾随"，以及同一元素class=org.springframework.web.servlet.view.InternalResourceViewResolver" 中class 属性之前的开头"

    <beans:bean id="viewResolver" 
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <beans:property name="prefix">
          <beans:value>/WEB-INF/</beans:value>
        </beans:property>
        <beans:property name="suffix">
          <beans:value>.jsp</beans:value>
        </beans:property>
     </beans:bean>

【讨论】：

请看一下我最后的编辑。你在某些地方想念"