java - ServletContextListener 问题 | HTTP 状态 404 -

Question

据观察，每当我向 web.xml 添加 Listener 类时，整个 Web 应用程序就会停止运行。请找到下面的代码:

web.xml

 <listener>
    <listener-class>Reminder</listener-class>
</listener>

提醒.java

@Override
public void contextInitialized(ServletContextEvent sce) {
    try {
        response.getWriter().print("Initasdadsa");
    } catch (IOException ex) {
        Logger.getLogger(Reminder.class.getName()).log(Level.SEVERE, null, ex);
    }
}

@Override
public void contextDestroyed(ServletContextEvent sce) {
    Enumeration<Driver> drivers = DriverManager.getDrivers();
    while (drivers.hasMoreElements()) {
        Driver driver = drivers.nextElement();
        try {
            DriverManager.deregisterDriver(driver);
        } catch (SQLException e) {
        }

    }
}

当我部署上述应用程序的 .war 文件时，它显示:

HTTP Status 404 - type Status report
message description The requested resource is not available.Apache Tomcat/6.0.24

Tomcat日志文件如下:

May 9, 2013 3:57:10 PM org.apache.catalina.startup.HostConfig checkResources
INFO: Undeploying context [/CloudStorage]
May 9, 2013 3:57:10 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: A web application registered the JBDC driver [com.mysql.jdbc.Driver] but failed         
to unregister it when the web application was stopped. To prevent a memory leak, the   
JDBC    Driver has been forcibly unregistered.
May 9, 2013 3:57:50 PM org.apache.catalina.startup.HostConfig deployWAR
INFO: Deploying web application archive CloudStorage.war
May 9, 2013 3:57:50 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
May 9, 2013 3:57:50 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/CloudStorage] startup failed due to previous errors
May 9, 2013 3:57:50 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: A web application registered the JBDC driver [com.mysql.jdbc.Driver] but failed       
to unregister it when the web application was stopped. To prevent a memory leak, the 
JDBC Driver has been forcibly unregistered.

当我省略 Listener 部分时，应用程序运行正常。 :-(

我做错了什么？

Answer 1

除非您的类位于默认包中，否则您需要在 web.xml 中提供 Reminder 类的完整限定名称，例如“com.example.Reminder”。

如果它在默认包中，则可能存在另一个问题。