今天把我的web应用冲tomcat迁移到了glassfish，包括两个应用，但是第二个应用报了Caused by:
org.apache.commons.logging.LogConfigurationException:
org.apache.commons.logging.LogConfigurationException:
org.apache.commons.logging.LogConfigurationException: Invalid class
loader hierarchy.  You have more than one version of
'org.apache.commons.logging.Log' visible, which is not allowed.
(Caused by org.apache.commons.logging.LogConfigurationException:
Invalid class loader hierarchy.  You have more than one version of
'org.apache.commons.logging.Log' visible, which is not allowed.)
(Caused by org.apache.commons.logging.LogConfigurationException:
org.apache.commons.logging.LogConfigurationException: Invalid class
loader hierarchy.  You have more than one version of
'org.apache.commons.logging.Log' visible, which is not allowed.
(Caused by org.apache.commons.logging.LogConfigurationException:
Invalid class loader hierarchy.  You have more than one version of
'org.apache.commons.logging.Log' visible, which is not allowed.))
的错误，如果把那个jar包删除，又出现java.lang.NoClassDefFoundError: org/apache/commons/
logging/LogFactory，这个jar包在应用WEB-INF/lib下，按理说classloader属于Web级不应该冲突，请问有人
遇到过吗？

http://forum.springsource.org/showthread.php?t=44210