For some queries, it's necessary to create a subquery or join involving a new stream of entities from the database. This normally requires access to the entity manager or connection to the database. Since Java 8 does not provide any reflection capabilities for lambdas, Jinq uses serialization to find their contents. If a query uses an entity manager to create a stream of entities, then the query will need to be passed in an entity manager. Often this entity manager is not serializable, meaning Jinq cannot understand the lambda and generate queries from it.
The InQueryStreamSource is a way for Jinq to pass in a backdoor way to generate streams of entities into lambdas.
| |