在使用Spring相關產品時，你可能會碰到下面這種異常：
Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
這是異常的第一行，按以往的經驗，第一行應該就是問題所在，但是實際上，從這行來看你根本不知道錯在哪里。

后面接下來的是：
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'

上面的內容是我將重復信息去掉，并分塊后的結果。

從報錯機制可以看出來，spring出現異常不同于普通的java異常，我們查異常的習慣一般是關注第一行，但是sping恰恰相反，要在sping中查錯，你必須分解他，因為spring的嵌套層次比較多，它報錯是從最高層報起，然后逐層往下，每個層次都會要報錯，直到最終出錯的地方，因此查sping的錯必須逐層分解到最底層，那里才是真正出錯的地方。

OK，現在看出來了，真正錯誤的原因是：
Failed to convert property value of type [net.sf.ehcache.Cache]
to required type [net.sf.ehcache.Ehcache] for property 'cache'

我出現這個錯誤的原因是使用了Acegi 1.0.5，它本身自帶了ehcache 1.2.4.jar
但是我同時還使用了hibernate3.1,從Eclipse導入hibernate3.1時，將會導入ehcache 1.1.jar，因為hibernate本身也要使用EHCache，但是版本不同。