public class Employee {

private String name;

private String id;

private Long age;

private Currency salaryCurrency;

private Double pay;

private isActive;

private Type type = Type.CONTRACT;

//getter setters

}

public enum Type {

CONTRACT,PERMANENT;

}

Employee emp = new Employee();
emp.setType(Type.PERMANENT);
emp.setAge(30);
emp.setName("TestUser");
PojoCodecProvider builder = PojoCodecProvider.builder().conventions(Conventions
        .DEFAULT_CONVENTIONS)
        .automatic(false).register("com.test").build();
CodecRegistry pojoCodecRegistry = CodecRegistries.fromRegistries(fromProviders(builder),
        fromCodecs(new LongCodec(),new CurrencyCodec(),
                new StringCodec(), new DateCodec(), new BooleanCodec(), new DoubleCodec()));
emp.setId(UUID.randomUUID().toString());
Codec<Employee> st = builder.get(Employee.class,pojoCodecRegistry);
BsonDocument doc = new BsonDocument();
st.encode(new BsonDocumentWriter(doc),emp, EncoderContext.builder().isEncodingCollectibleDocument(true).build
        ());