ServletContextListener问题| HTTP 404 -

Question

已经观察到，每当我向web.xml添加Listener类时，整个Web应用程序都会停止运行。请找到下面的代码：

web.xml

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

Reminder.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，应用程序工作正常。:-(

我做错了什么？

Answer 1

除非您的类在默认包中，否则您需要在web.xml中给出提醒类的全限定名称，如"com.example.Reminder“。

如果它在默认包中，那么可能还有另一个问题。