mongodb upsert from java: how to get _id of existing object? -


i'm using mongo-jackson-wrapper java , mongodb. find object querying field of mine (not _id field), , need know _id field value, whether net result update or insert. however, exception:

com.mongodb.mongoexception: no objects return     @ net.vz.mongodb.jackson.writeresult.getsavedid(writeresult.java:97)

the exception comes wrapper, not mongodb driver itself. 

writeresult<entitydocument, string> wr     = coll.update(dbquery.is("corefentityid", corefentityid), up, true,  false);

what (if anything) right way this?

you need use findandmodify , set returnnew true

you can view javadoc

this code should trick haven't tested it.

coll.findandmodify(dbquery.is("corefentityid", corefentityid), null, null, false, up, true, false);


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