在使用Spring相關(guān)產(chǎn)品時(shí)，你可能會(huì)碰到下面這種異常：
Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
這是異常的第一行，按以往的經(jīng)驗(yàn)，第一行應(yīng)該就是問(wèn)題所在，但是實(shí)際上，從這行來(lái)看你根本不知道錯(cuò)在哪里。

后面接下來(lái)的是：
Error creating bean with name 'basicProcessingFilter'
Cannot resolve reference to bean 'authenticationManager'
while setting bean property 'authenticationManager';

nested exception is Error creating bean with name 'authenticationManager'
Cannot resolve reference to bean 'casAuthenticationProvider'
while setting bean property 'providers' with key [0];

nested exception is : Error creating bean with name 'casAuthenticationProvider'
Cannot resolve reference to bean 'statelessTicketCache'
while setting bean property 'statelessTicketCache';

nested exception is: Error creating bean with name 'statelessTicketCache'
Error setting property values;

nested exception is
nested PropertyAccessExceptions (1) are:
PropertyAccessException 1:
TypeMismatchException:

Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

Error creating bean with name 'authenticationManager'
Cannot resolve reference to bean 'casAuthenticationProvider'
while setting bean property 'providers' with key [0];

nested exception is
Error creating bean with name 'casAuthenticationProvider'
Cannot resolve reference to bean 'statelessTicketCache' while setting bean property 'statelessTicketCache';

nested exception is
Error creating bean with name 'statelessTicketCache'
Error setting property values;

nested exception is
nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.TypeMismatchException:
Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

Error creating bean with name 'casAuthenticationProvider'
Cannot resolve reference to bean 'statelessTicketCache'
while setting bean property 'statelessTicketCache';

nested exception is
Error creating bean with name 'statelessTicketCache'
Error setting property values;

nested exception is PropertyAccessExceptionsException;
nested PropertyAccessExceptions (1) are:
PropertyAccessException 1:TypeMismatchException:
Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

Error creating bean with name 'statelessTicketCache'
Error setting property values;

nested exception is PropertyAccessExceptionsException;
nested PropertyAccessExceptions (1) are:
PropertyAccessException 1: org.springframework.beans.TypeMismatchException:
Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

PropertyAccessExceptionsException;
nested PropertyAccessException details (1) are:
PropertyAccessException 1:
ypeMismatchException:
Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

上面的內(nèi)容是我將重復(fù)信息去掉，并分塊后的結(jié)果。

從報(bào)錯(cuò)機(jī)制可以看出來(lái)，spring出現(xiàn)異常不同于普通的java異常，我們查異常的習(xí)慣一般是關(guān)注第一行，但是sping恰恰相反，要在sping中查錯(cuò)，你必須分解他，因?yàn)閟pring的嵌套層次比較多，它報(bào)錯(cuò)是從最高層報(bào)起，然后逐層往下，每個(gè)層次都會(huì)要報(bào)錯(cuò)，直到最終出錯(cuò)的地方，因此查sping的錯(cuò)必須逐層分解到最底層，那里才是真正出錯(cuò)的地方。

OK，現(xiàn)在看出來(lái)了，真正錯(cuò)誤的原因是：
Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

我出現(xiàn)這個(gè)錯(cuò)誤的原因是使用了Acegi 1.0.5，它本身自帶了ehcache 1.2.4.jar
但是我同時(shí)還使用了hibernate3.1,從Eclipse導(dǎo)入hibernate3.1時(shí)，將會(huì)導(dǎo)入ehcache 1.1.jar，因?yàn)閔ibernate本身也要使用EHCache，但是版本不同。