NullPointerException at org.springframework.security.web.FilterChainProxy.getFilters

Question

I tried to use spring-security, and get this error.

java.lang.NullPointerException
at org.springframework.security.web.FilterChainProxy.getFilters(FilterChainPro         


        

Answer 1

You are creating a FilterChainProxy bean with an null filter list in your XML configuration and this bean is than used in the web.xml by DelegatingFilterProxy. FilterChainProxy#getFilters tries to iterate over the null list and naturally fails with a NullPointerException.

The root of the problem is, that you cannot mix Java configuration and traditional XML configuration like this. The Java configuration creates a separate FilterChainProxy bean that has nothing to do with the bean configured via XML.