Error 404 on spring logout

I am trying to add login functionality to my app with spring security v.4. Login works fine, but when I am trying to logout an error 404 appears. Spring Security reference says that default logout URL is /logout. My app is deployed under /app URL and I tried following URL's localhost:8080/app/logout and localhost:8080/app/json/logout. I found some similar issues on stack but they are about case when CSRF protection is used and I'm not using it. Here is part of my my web.xml file

    <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>/WEB-INF/json-servlet.xml,
        /WEB-INF/applicationContext.xml</param-value>
</context-param>

<filter>
    <filter-name>springSecurityFilterChain</filter-name>
    <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>

<filter-mapping>
    <filter-name>springSecurityFilterChain</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
    <servlet-name>json</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
    <servlet-name>json</servlet-name>
    <url-pattern>/json/*</url-pattern>
</servlet-mapping>

and my json-servlet.xml where is spring security configuration:

    <context:component-scan base-package="test" />
<mvc:annotation-driven />

<security:http>
    <security:intercept-url pattern="/**" access="hasRole('USER')" />
    <security:form-login />
    <security:logout />
</security:http>

<security:authentication-manager>
    <security:authentication-provider>
        <security:user-service>
            <security:user name="test" password="1" authorities="ROLE_USER, ROLE_ADMIN" />
        </security:user-service>
    </security:authentication-provider>
</security:authentication-manager>

Thanks in advance.