Question

We have Spring MVC application. We are trying to integrate the Spring security in it.

We have written our custom authentication provider which will do the work of authentication.

Below is the code for my custom authentication provider.

    public class CustomAuthenticationProvider extends DaoAuthenticationProvider {

    @Autowired
    private AuthenticationService authenticationService;

    @Override
    public Authentication authenticate(Authentication authentication) {

        CustomAuthenticationToken auth = (CustomAuthenticationToken) authentication;

        String username = String.valueOf(auth.getPrincipal());
        String password = String.valueOf(auth.getCredentials());

        try {

            Users user = new User();
            user.setUsername(username);
            user.setPassword(PasswordUtil.encrypt(password));

            user = authenticationService.validateLogin(user);

            return auth;
        } catch (Exception e) {
            throw new BadCredentialsException("Username/Password does not match for " + username);
        }
    }

    @Override
    public boolean supports(Class<? extends Object> authentication) {
        return (CustomAuthenticationToken.class.isAssignableFrom(authentication));

    }
}

Here i am getting NullpointerException on the following line

user = authenticationService.validateLogin(user);

The authenticationService is not getting autowired in the custom authentication provider. While the same service authenticationService is autowired in the same way in my MVC controller.

Is this because authentication provider is a Spring security component?

Below is a my web.xml

    <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
        /WEB-INF/spring/myApp-security.xml
    </param-value>
</context-param>

<servlet>
    <servlet-name>myApp</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/spring/myApp-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>myApp</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<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>

Edit 1 :-

I have added the following lines in my spring security configuration file.

<beans:bean id="customAuthenticationProvider" class="com.myApp.security.provider.CustomAuthenticationProvider">
    <beans:property name="userDetailsService" ref="userDetailsService"/>   
</beans:bean>

Please help how to autowire my service classes in the Spring security components?

Answer 1

Perhaps autowiring postprocessor is not enabled in the root application context (but enabled in the DispatcherServlet‘s context as a side effect of <mvc:annotation-driven> or <context:component-scan>).

You can enable it by adding <context:annotation-config> to myApp-security.xml.