Custom Authentication Via JSON login request in Spring Security

SpringSecurityConfig.java

@EnableWebSecurity
public class SpringSecurityConfig extends WebSecurityConfigurerAdapter {

	@Override
	protected void configure(HttpSecurity http) throws Exception {
		http
			.authorizeRequests()
			.antMatchers("/", "/login", "/logout").permitAll()
			.anyRequest().authenticated()
			.and().addFilterAt(customAuthenticationFilter(), UsernamePasswordAuthenticationFilter.class)
			.formLogin().loginProcessingUrl("/login")
			.and()
			.csrf().disable();
	}

	private CustomUsernamePasswordAuthenticationFilter customAuthenticationFilter() throws Exception {
		CustomUsernamePasswordAuthenticationFilter filter = new CustomUsernamePasswordAuthenticationFilter();
		filter.setAuthenticationManager(authenticationManager());
		return filter;
	}
}

My requirement was to accept json body for login . Without this filter I was using formlogin and with success login, i was able to redirect on the oauth redirect URL configured at client Database. After this filter redirect stopped working . Any idea?