springframework data mongodb core query Criteria -


want activity if activity.getusername() == null appropriate activity.getdatetime()

public list<activity> find(activity activity) {     query query = new query(             criteria                     .where("datetime").is(activity.getdatetime())                     .and("username").is(activity.getusername())     );     return mongotemplate.find(query, activity.class); }

how can this?


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