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public enum Type {

    EVENT("event"),

    ACTIVITY("activity");

    private final String value;

    Type(String value) {

        this.value = value;

    }

    public String getValue() {

        return value;

    }

    private static final Map<String, Type> ENUM_MAP;

    static {

        ENUM_MAP = Arrays.stream(values())

                .collect(Collectors.toMap(Type::getValue, t -> t));

    }

    public static Type fromString(String value) {

        return ENUM_MAP.get(value);

    }

}

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public class Todo {

    private String id;

    private String name;

    private boolean completed;

    private Type type;

    // ... getters and setters ...

}

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@GetMapping("/todos")

public Collection<Todo> read(@RequestParam(required = false) Type type) {

    // ... implementation ...

}

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public class StringToTypeConverter implements Converter<String, Type> {

    @Override

    public Type convert(String source) {

        return Type.fromString(source);

    }

}

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@Configuration

public class WebConfig implements WebMvcConfigurer {

    @Override

    public void addFormatters(FormatterRegistry registry) {

        registry.addConverter(new StringToTypeConverter());

    }

}

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@Document(collection = "todos")

public class Todo {

    @Id

    private String id;

    // ... other fields ...

    @ValueConverter(MongoEnumConverter.class)

    private Type type;

    // ... getters and setters ...

}

public class MongoEnumConverter implements PropertyValueConverter<Type, String> {

    @Override

    public Type convert(String source) {

        return Type.fromString(source);

    }

    @Override

    public String write(Type value) {

        return value.getValue();

    }

}