The getId method was not called

[lyworry]

The getId method was not called

[mp911de]

Persistable is a Spring Data API to determine the identifier and whether an object is new or not. Persistable is only used by Spring Data modules in which we fully control the object lifecycle such as Elasticsearch.

JPA handles object lifecycles on its own with the concept of attached entities hence Spring Data JPA doesn't make use of Persistable for inserts vs. updates, instead, what you already found, whether to call EntityManager.merge(…) vs. EntityManager.persist(…).

Generally speaking, if you use a single cache (Cache.cacheMap.get(md5)) for two persistence technologies, after associating the object with your cache, all related store modules will use the same outcome for isNew.

Ideally, you use the md5 value as primary key if that is what you're looking for.

[lyworry]

Persistable seem to be unuseful in spring data jpa.All operations depend on whether id has value.I can't imagine what can i do with Persistable .I think spring data jpa and spring data elasticsearch,they all belong to spring data,
they implements Persistable,They should have the same behavior

1. if document ’s id has value and isNew=true will throw exception, isNew=false will select by id and update;
2. if document ’s id is null and isNew=true will insert,isNew=false wll also insert;