Eclipse中没有启动Tomcat的servlet日志

Question

我正在使用

• 雄猫 9
• 日食版本： 2020-09 （4.17.0）
• Apache Maven 3.6.3

我开始编写一个servlet，它运行在Tomcat容器中。当我在Ecplise(在服务器上调试)中运行它时，我可以看到一些来自Tomcat的日志输出。喜欢

INFO: Initializing ProtocolHandler ["http-nio-8080"]
Dec 08, 2020 4:21:34 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-127.0.0.1-8009"]
Dec 08, 2020 4:21:34 PM org.apache.catalina.startup.Catalina load
INFO: Server initialization in [1291] milliseconds
Dec 08, 2020 4:21:34 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Catalina]
Dec 08, 2020 4:21:34 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet engine: [Apache Tomcat/9.0.39]
Dec 08, 2020 4:21:36 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Dec 08, 2020 4:21:38 PM org.glassfish.jersey.server.wadl.WadlFeature configure
WARNING: JAXBContext implementation could not be found. WADL feature is disabled.
Dec 08, 2020 4:21:39 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory [/home/myname/bin/tomcat/apache-tomcat-9.0.39/webapps/examples]
Dec 08, 2020 4:21:39 PM org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
Dec 08, 2020 4:21:39 PM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()

... ...

servlet运行良好，开始如下所示:

public class MyMain extends Application {
    
    private final static Logger logger = LoggerFactory.getLogger(SdpApiMain.class);
    
    @Override
    public Set<Class<?>> getClasses() {
        Set<Class<?>> s = new HashSet<Class<?>>();
        s.add(Test.class);
        s.add(User.class);
        logger.debug("We are in main class, collectiong resources.");
        return s;
    }
}

但我看不到调试行。

对于日志记录，我使用的是slf4j 1.7和log4j2。我有以下＜code＞log4j2.xml

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
  <Appenders>
    <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
    </Console>
  </Appenders>
  <Loggers>
    <Root level="debug">
      <AppenderRef ref="Console"/>
    </Root>
  </Loggers>
</Configuration>

我是否只需要Eclipse中的不同控制台视图？我的配置有任何问题，如何调试它？

Answer 1

解决此问题的两个步骤：

我们正在谈论Eclipse，所以我添加了-Dlog4j2.debug=true标志到

运行配置-

然后我可以看到，在这个设置中，log4j2需要＜code＞log4j2web＜code＞依赖项。而且它抱怨它看不到配置文件，所以我将＜code＞log4j2.xml＜/code＞添加到正确的位置（在类路径中）。（Eclipse：右键单击src/main/resources-

当没有配置文件时，它使用sdt配置，默认为日志级别错误。