tomcat为什么启动报错?

Connected to server
[2017-05-26 02:39:29,142] Artifact Demo:war exploded: Artifact is being deployed, please wait...
26-May-2017 14:39:39.048 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory C:\apache-tomcat-8.0.44\webapps\manager
26-May-2017 14:39:39.311 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory C:\apache-tomcat-8.0.44\webapps\manager has finished in 252 ms
26-May-2017 14:39:39.858 信息 [RMI TCP Connection(7)-127.0.0.1] org.apache.jasper.servlet.TldScanner.scanJars 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.
log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader).
log4j:WARN Please initialize the log4j system properly.
26-May-2017 14:39:41.671 严重 [RMI TCP Connection(7)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal One or more listeners failed to start. Full details will be found in the appropriate container log file
26-May-2017 14:39:41.671 严重 [RMI TCP Connection(7)-127.0.0.1] org.apache.catalina.core.StandardContext.startInternal Context [] startup failed due to previous errors
[2017-05-26 02:39:41,721] Artifact Demo:war exploded: Error during artifact deployment. See server log for details.