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java.lang.NullPointerException: null at org.springframework.security.web.csrf.HttpSessionCsrfTokenRepository.saveToken(HttpSessionCsrfTokenRepository.java:58)[spring-security-web-3.2.0.RC2.jar:3.2.0.RC2] at org.springframework.security.web.csrf.CsrfFilter$SaveOnAccessCsrfToken.saveTokenIfNecessary(CsrfFilter.java:207)[spring-security-web-3.2.0.RC2.jar:3.2.0.RC2] at org.springframework.security.web.csrf.CsrfFilter$SaveOnAccessCsrfToken.getToken(CsrfFilter.java:165)[spring-security-web-3.2.0.RC2.jar:3.2.0.RC2] at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:92)[spring-security-web-3.2.0.RC2.jar:3.2.0.RC2] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)[spring-web-3.2.5.RELEASE.jar:3.2.5.RELEASE] at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)[spring-security-web-3.2.0.RC2.jar:3.2.0.RC2] at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57)[spring-security-web-3.2.0.RC2.jar:3.2.0.RC2]