tomcat启动报错原因分析及解决

来源：互联网发布：中控考勤机数据库修改编辑：程序博客网时间：2024/06/06 03:20

1.报错日志

拿到catalina.log的启动日志

2015-8-13 15:24:02 org.apache.catalina.core.StandardContext start严重: Error listenerStart2015-8-13 15:24:02 org.apache.catalina.core.StandardContext start严重: Context [/callback] startup failed due to previous errors2015-8-13 15:24:02 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc严重: The web application [/callback] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.2015-8-13 15:24:02 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc严重: The web application [/callback] registered the JDBC driver [oracle.jdbc.driver.OracleDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.2015-8-13 15:24:02 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/callback] appears to have started a thread named [Thread-2] but has failed to stop it. This is very likely to create a memory leak.2015-8-13 15:24:02 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/callback] appears to have started a thread named [Thread-3] but has failed to stop it. This is very likely to create a memory leak.2015-8-13 15:24:02 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads严重: The web application [/callback] appears to have started a thread named [commons-pool-EvictionTimer] but has failed to stop it. This is very likely to create a memory leak.2015-8-13 15:24:03 org.apache.catalina.startup.HostConfig deployDirectory信息: Deploying web application directory ROOT2015-8-13 15:24:03 org.apache.coyote.http11.Http11Protocol start信息: Starting Coyote HTTP/1.1 on http-89202015-8-13 15:24:03 org.apache.jk.common.ChannelSocket init信息: JK: ajp13 listening on /0.0.0.0:80092015-8-13 15:24:03 org.apache.jk.server.JkMain start信息: Jk running ID=0 time=0/18  config=null2015-8-13 15:24:03 org.apache.catalina.startup.Catalina start信息: Server startup in 48288 ms

刚开始分析，怀疑是数据库有异常

The web application [/callback] registered the JDBC driver [com.alibaba.druid.proxy.DruidDriver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

然后通过DBA分析，发现数据库所有的连接都是正常的，没有未释放的链接。然后立即转向，发现这样一句：

严重: Context [/callback] startup failed due to previous errors

不过这里没有发现报错日志，然后立即去查localhost.log，看到报错日志

2015-8-13 15:23:17 org.apache.catalina.core.ApplicationContext log<pre name="code" class="html"><span style="font-family: Arial, Helvetica, sans-serif;">信息: Initializing Logback from [/u1pf_bgwghttp/tomcat_bgw/webapps/callback/WEB-INF/logback.xml]</span>

2015-8-13 15:23:57 org.apache.catalina.core.StandardContext listenerStart严重: Exception sending context initialized event to listener instance of class ch.qos.logback.ext.spring.web.LogbackConfigListenerjava.lang.RuntimeException: Unexpected error while configuring logback at ch.qos.logback.ext.spring.web.WebLogbackConfigurer.initLogging(WebLogbackConfigurer.java:146)

然后又看到： Caused by: java.net.UnknownHostException:

www.w3.org 异常。

然后打开logback.xml配置文件，看到如下配置：

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/2002/xmlspec/dtd/2.10/xmlspec.dtd"><configuration><!-- ==================== 控制台输出 ===================== --><appender name="stdout" class="ch.qos.logback.core.ConsoleAppender"><encoder><pattern>[%d{yyyy-MM-dd HH:mm:ss.SSS}] [%thread] [%-5level] [%logger{36}] - %msg%n</pattern></encoder><filter class="ch.qos.logback.classic.filter.ThresholdFilter"><level>INFO</level><level>DEBUG</level></filter></appender>

2.定位原因，解决问题

到这一步，基本定位到原因了，下一步，就要看下为啥报错了。spring解析logback.xml要访问

http://www.w3.org/2002/xmlspec/dtd/2.10/xmlspec.dtd

然后ping www.w3.org 不通，怀疑是最近主机组做了网络限制。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/2002/xmlspec/dtd/2.10/xmlspec.dtd">

这句配置，对于自定义xml文件来说，不是必须。所以，去掉这行配置。问题解决。

3.遗留疑问

3.1 为什么spring解析logback.xml要调用 http://www.w3.org/2002/xmlspec/dtd/2.10/xmlspec.dtd

答：待研究

3.2 http://www.w3.org/2002/xmlspec/dtd/2.10/xmlspec.dtd在这里到底做什么用？

答：DTD是一种保证XML文档格式正确的有效方法，可以比较XML文档和DTD文件来看文档是否符合规范，元素和标签使用是否正确。一个DTD文档包含：元素的定义规则，元素间关系的定义规则，元素可使用的属性，可使用的实体或符号规则。

DTD分为内部DTD与外部DTD,内部DTD包含在XML文档中,外部DTD则通过URL引用.一个DTD文件是以.dtd结尾的文本文件

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