custom.java

class Config extends AbstractCouchbaseConfiguration {

    protected List<String> getBootstrapHosts() {
        return Arrays.asList("127.0.0.1");
    }

    protected String getBucketName() {
        return "travel-sample";
    }

    protected String getBucketPassword() {
        return "";
    }

    @Override
    public MappingCouchbaseConverter mappingCouchbaseConverter() throws Exception {
        return new MyMappingCouchbaseConverter(couchbaseMappingContext(), typeKey());
    }
    
}

class MyMappingCouchbaseConverter extends MappingCouchbaseConverter {

    public MyMappingCouchbaseConverter(MappingContext<? extends CouchbasePersistentEntity<?>, CouchbasePersistentProperty> mappingContext) {
        super(mappingContext);
    }

    public MyMappingCouchbaseConverter(MappingContext<? extends CouchbasePersistentEntity<?>, CouchbasePersistentProperty> mappingContext, String typeKey) {
        super(mappingContext, typeKey);
    }

    @Override
    public void write(Object source, CouchbaseDocument target) {
        if (source instanceof MyEntity) {
            // todo: custom conversion from your entity into target
        } else {
            super.write(source, target);
        }
    }

    @Override
    public <R> R read(Class<R> clazz, CouchbaseDocument source) {
        if (MyEntity.class.isAssignableFrom(clazz)) {
            // todo: init clazz and assign fields from source
        } else {
            return super.read(clazz, source);
        }
    }


}

class MyEntity {

}