servlet <load-on-startup>设置时遇到的问题

本文介绍了一个关于Servlet自动加载时出现的错误案例,并详细解释了如何通过调整构造函数的访问权限来解决问题。

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创建这个Servlet类的时候配置Servlet的自动加载的时候报了错

public class LDemo extends HttpServlet {

     LDemo(){
        System.out.println("LDemo创建了");
    }
    @Override
    public void init() throws ServletException {
        System.out.println("LDemo无参init被调用");
    }
}


严重: Servlet /WEB threw load() exception
java.lang.IllegalAccessException: Class org.apache.catalina.core.StandardWrapper can not access a member of class com.java.servlet.life.LDemo with modifiers ""
    at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:109)
    at java.lang.Class.newInstance(Class.java:368)
    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:4425)
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:4738)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:583)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079)
    at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002)
    at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506)
    at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
    at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
    at org.apache.catalina.core.StandardHost.start(StandardHost.java:822)
    at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
    at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
    at org.apache.catalina.core.StandardService.start(StandardService.java:525)
    at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
    at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
    at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)

结果发现是LDemo的构造函数没有加public造成的,解决办法就是在Ldemo()前加上访问权限修饰符即可。

<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.3" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_3.xsd"> <display-name>Archetype Created Web Application</display-name> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list> <!-- 配置spring资源 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:application.xml</param-value> </context-param> <!-- 乱码问题 --> <filter> <filter-name>CharacterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>utf-8</param-value> </init-param> </filter> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!--配置springmvc DispatcherServlet接收到的http请求通过DispatcherServlet进行分发。--> <servlet> <servlet-name>note</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <!--Sources标注的文件夹下需要新建一个spring文件夹--> <param-name>contextConfigLocation</param-name> <param-value>classpath:spring/spring-mvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>note</servlet-name> <url-pattern>*.do</url-pattern> </servlet-mapping> </web-app>检查代码修改正确
06-07
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