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java.lang.NullPointerException: null at org.springframework.web.method.annotation.ModelFactory.findSessionAttributeArguments(ModelFactory.java:141)[spring-web-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.method.annotation.ModelFactory.initModel(ModelFactory.java:99)[spring-web-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:722)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:920)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:816)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)[servlet-api-3.0.jar:na] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:801)[spring-webmvc-3.2.1.RELEASE.jar:3.2.1.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)[servlet-api-3.0.jar:na]