Custom converter doesn't with with @PathVariable in Spring MVC method

[caoyuanqi]

As we know we have to add link to resources. I did a mapping from String to Object with hateoas as below:

    @GetMapping("/{role}")
    public ResponseEntity getRoleInfo(@PathVariable  Role role) {

The formatter works very well. But when I try to get link as below:

Link selfLink = linkTo(methodOn(RoleController.class).getRoleInfo(role)).withSelfRel();

error like below:

org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [@org.springframework.web.bind.annotation.PathVariable au.com.othera.auth.entity.Role] to type [java.lang.String]

Configuration like below:

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter{


    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new RoleStringConvertor());
    }

}

formatter like below

import java.text.ParseException;
import java.util.Locale;

@Component
public class RoleFormatter implements Formatter<Role> {

    private RoleService roleService;

    @Autowired
    public RoleFormatter(RoleService roleService) {
        this.roleService = roleService;
    }

    @Override
    public Role parse(String roleId, Locale locale) throws ParseException {
        return roleService.getRoleInfo(roleId);
    }

    @Override
    public String print(Role role, Locale locale) {
        return role.getId();
    }
}

Converter like below:

@Component
public class RoleStringConvertor implements Converter<Role, String>{

    @Override
    public String convert(Role source) {
        return source.getId();
    }
}

Spring version is

springBootVersion = '1.5.3.RELEASE'
springCloudVersion = 'Dalston.SR1'

Any Suggestion or any configuration wrong?

[gregturn]

Spring HATEOAS, in order to support the static helpers methods like linkTo and methodOn, has a fixed list of message converters. Hence, it can't pick up dynamically built ones in the application context.

Duplicates #654

[izeye]

This looks meant to be closed as a duplicate based on the above @gregturn 's comment.

[gregturn]

Indeed.