系統版本：CentOS 6.6 x64
java版本：1.7.0_55
問題描述：
遷移Tomcat工程啟動后日志出現報錯，內容如下：
Jan 20, 2018 7:02:50 PM org.apache.catalina.core.StandardContext startInternal SEVERE: Error listenerStart Jan 20, 2018 7:02:49 PM org.apache.catalina.core.StandardContext startInternal SEVERE: Context [] startup failed due to previous errors Jan 20, 2018 7:02:49 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-bio-8680"] Jan 20, 2018 7:02:49 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 30535 ms
從以上內容中並不能獲得到關鍵信息，其中只提示了有錯誤存在卻沒有說明故障點，此時需要修改日志級別來打印更多的信息來幫助我們排錯，方法如下。
解決方案：
在tomcat工程中的classes路徑下，在文件logging.properties中添加如下內容，如沒有該文件則直接創建。
handlers = org.apache.juli.FileHandler, java.util.logging.ConsoleHandler org.apache.juli.FileHandler.level = FINE org.apache.juli.FileHandler.directory = ${catalina.base}/logs org.apache.juli.FileHandler.prefix = error-debug. java.util.logging.ConsoleHandler.level = FINE java.util.logging.ConsoleHandler.formatter=java.util.logging.SimpleFormatter
接下來重啟Tomcat，然后再查看日志，我所遇到的問題如下：
Jan 20, 2018 7:07:20 PM org.apache.catalina.core.StandardContext listenerStart SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'dataSourceHbe' defined in file [/root/svn/busservice/WebContent/WEB-INF/classes/applicationContext_hbe.xml]: Could not resolve placeholder 'hbe.driver' in string value "${hbe.driver}" at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:209) at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.processProperties(PropertyPlaceholderConfigurer.java:220) at org.springframework.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:84) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:694) at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:669) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:389) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:294) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4791) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5285) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:618) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:650) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1582) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask.run(FutureTask.java:262) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)
通過以上信息確認問題是出現在數據庫連接上，將連接信息重新修改后重啟Tomcat，“SEVERE: Error listenerStart”沒有再次出現。
總結：
以上介紹了在排錯中可以通過修改Tomcat日志級別的方式來獲取更多的日志信息，進而幫助我們排錯，而具體的問題就要結合實際情況去確認，並非導致“SEVERE: Error listenerStart”的原因都一致。
參考資料：
http://blog.csdn.net/wsm0712syb/article/details/50946409
-The End-
Tank
20180129