Question

我有一个不会部署Tomcat的WAR，虽然它通常给我原因或者说明为什么它不会部署应用程序，Tomcat的catalina日志输出只是说明：

严重：由于之前的错误，上下文[/ appmon-qa]启动失败

这是web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app
    xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
    version="2.4">

    <!-- The display name of this web application -->
    <display-name>AppMonitor</display-name>

    <listener>
        <listener-class>
            com.me.myorg.appmon.AppMonitor
        </listener-class>
    </listener>
</web-app>

AppMonitor类中的重要内容：

public class AppMonitor implements ServletContextListener {
    @Override
    public void contextDestroyed(ServletContextEvent event) {
        return;
    }

    @Override
    public void contextInitialized(ServletContextEvent event) {
        try {
            // Guts of my monitor app
        } catch(Exception exc) {
            System.out.println("Something bad happened!\n" + exc.getMessage());
        }
    }
}

非常模糊/不合理的日志输出：

INFO: Deploying web application archive appmon-qa.war
Jun 8, 2012 9:45:30 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error listenerStart
Jun 8, 2012 9:45:31 AM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [/appmon-qa] startup failed due to previous errors
Jun 8, 2012 9:45:31 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory docs
Jun 8, 2012 9:45:31 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory examples
Jun 8, 2012 9:45:32 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory host-manager
Jun 8, 2012 9:45:32 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory manager
Jun 8, 2012 9:45:32 AM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory ROOT
Jun 8, 2012 9:45:32 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Jun 8, 2012 9:45:32 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Jun 8, 2012 9:45:32 AM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8010"]
Jun 8, 2012 9:45:32 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2875 ms

我取消部署了这个WAR并部署了另一个我知道正常工作且Tomcat 7.0.19没有任何问题地启动它，所以我知道它不是Tomcat /配置问题。这显然是我的WAR的错误。目录结构如下：

appmon-qa.war/
    META-INF/
        MANIFEST.MF
    WEB-INF/
        classes/
            All of my binaries
        lib/
            All JAR dependencies
        web.xml

如果我的（超级简单）web.xml出现问题，Tomcat 应该在日志输出中抱怨。如果我的web.xml/ServletContextListener很好，但是某些内容在我的contextInitialized方法中引发了异常，则catch块会将消息打印到控制台 - 但这种情况不会发生。

关于什么可能是潜在问题的任何想法或我有什么选择开始诊断这个？提前谢谢！

Answer 1

你应该在你的方法中调用超类。

@Override
public void contextInitialized(ServletContextEvent servletContextEvent) {
        super.contextInitialized(servletContextEvent);

.... }

和

   @Override
    public void contextDestroyed(ServletContextEvent servletContextEvent) {
        super.contextDestroyed(servletContextEvent);
    }

作为额外的，您可以确保增加tomcat服务器上的日志级别（可能集成log4j） http://tomcat.apache.org/tomcat-7.0-doc/logging.html

米哈伊

WAR不会部署到Tomcat 7.0.19

1 个答案: