quartz 中报错 commons.logging

quartz版本 quartz-1.8.4.jar
日志jar包： commons-logging-1.1.1.jar
commons-logging-api-1.1.1.jar
slf4j-api-1.5.10.jar
slf4j-log4j12-1.5.10.jar
log4j-1.2.14.jar

quartz 中 每隔1分钟调度一次 调度时间长了后出现下面这种错误。
有时候运行两天后出现如下错误，有时候运行一小时就出现此错误。
下面日志 每隔1分钟打印一次！！

这个错误怎么解决？？求各位指点一二。

2011-07-08 12:21:00,009 [loadScheduler_QuartzSchedulerThread] org.quartz.core.QuartzSchedulerThread     - Runtime error occured in main trigger firing loop.   
org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: java.lang.ThreadDeath (Caused by java.lang.ThreadDeath) (Caused by org.apache.commons.logging.LogConfigurationException: java.lang.ThreadDeath (Caused by java.lang.ThreadDeath))   
        at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543)   
        at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235)   
        at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209)   
        at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351)   
        at org.quartz.core.JobRunShell.<init>(JobRunShell.java:80)   
        at org.quartz.impl.StdJobRunShellFactory.borrowJobRunShell(StdJobRunShellFactory.java:86)   
        at org.quartz.core.QuartzSchedulerThread.run(QuartzSchedulerThread.java:386)   
Caused by:    
org.apache.commons.logging.LogConfigurationException: java.lang.ThreadDeath (Caused by java.lang.ThreadDeath)   
        at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:397)   
        at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529)   
        ... 6 more   
Caused by:    
java.lang.ThreadDeath   
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1229)   
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1189)   
        at org.apache.commons.logging.impl.LogFactoryImpl$1.run(LogFactoryImpl.java:441)   
        at java.security.AccessController.doPrivileged(AccessController.java:193)   
        at org.apache.commons.logging.impl.LogFactoryImpl.loadClass(LogFactoryImpl.java:435)   
        at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:376)   
        ... 7 more  

造成这个问题的原因：发布在linux上，因为停止了用命令停止了tomcat 但是 进程并没有真正停止调。需要kill调进程。