把博客改成热部署后，每次更新class文件后，服务器关闭会出现如下错误：


[14:40:28.434] java.lang.NoClassDefFoundError: org/apache/log4j/spi/ThrowableInformation

[14:40:28.434]  at org.apache.log4j.spi.LoggingEvent.<init>(LoggingEvent.java:154)

[14:40:28.434]  at org.apache.log4j.Category.forcedLog(Category.java:388)

[14:40:28.434]  at org.apache.log4j.Category.log(Category.java:853)

[14:40:28.434]  at org.apache.commons.logging.impl.Log4JLogger.error(Log4JLogger.java:251)

[14:40:28.434]  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:513)

[14:40:28.434]  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:486)

[14:40:28.434]  at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:742)

[14:40:28.434]  at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:455)

[14:40:28.434]  at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1090)

[14:40:28.434]  at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:1064)

[14:40:28.434]  at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:1010)

[14:40:28.434]  at org.springframework.web.context.ContextLoader.closeWebApplicationContext(ContextLoader.java:586)

[14:40:28.434]  at org.springframework.web.context.ContextLoaderListener.contextDestroyed(ContextLoaderListener.java:143)

[14:40:28.434]  at com.caucho.server.webapp.Application.stop(Application.java:2436)

[14:40:28.434]  at com.caucho.server.webapp.Application.destroy(Application.java:2459)

[14:40:28.434]  at com.caucho.server.deploy.DeployController.stopImpl(DeployController.java:703)

[14:40:28.434]  at com.caucho.server.deploy.DeployController.restartImpl(DeployController.java:582)

[14:40:28.434]  at com.caucho.server.deploy.StartAutoRedeployAutoStrategy.alarm(StartAutoRedeployAutoStrategy.java:176)

[14:40:28.434]  at com.caucho.server.deploy.DeployController.handleAlarm(DeployController.java:742)

[14:40:28.434]  at com.caucho.util.Alarm.handleAlarm(Alarm.java:339)

[14:40:28.434]  at com.caucho.util.Alarm.run(Alarm.java:309)

[14:40:28.434]  at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:527)

[14:40:28.434]  at com.caucho.util.ThreadPool.run(ThreadPool.java:449)

[14:40:28.434]  at java.lang.Thread.run(Thread.java:662)

[15:05:09.848] Server[] stopping

[15:05:09.866] Received close event


熟悉Spring源码的程序员会知道，这是spring扫描的DefaultListableBeanFactory关闭后，要关闭相应的bean出现的错误。

异常也给了很好的提示，就是没有发现类：

 ThrowableInformation

研究工程的mvn tree，发现有

org.slf4jslf4j-log4j121.5.6


依赖了log4j版本：

[INFO] +- org.slf4j:slf4j-log4j12:jar:1.5.6:compile

[INFO] |  \- org.slf4j:slf4j-api:jar:1.5.6:compile

[INFO] +- log4j:log4j:jar:1.2.17:compile


1.2.16以上版本才包含了ThrowableInformation

加入相应的pom依赖：


log4jlog4j1.2.17


再次热部署，成功，bug消失。

   

[15:08:24.601] Reloading com.li5jun.blog.velocity.VelocityViewRender

 ... ...

[15:08:24.693] Reloading com.li5jun.blog.service.impl.BlogServiceImpl