question: public static < T extends Bean > T load ( Bson query , T t ) { String collection = getCollection ( t . getClass ( ) ) ; if ( collection != null ) { try { return load ( query , null , t ) ; } catch ( Exception e ) { if ( log . isErrorEnabled ( ) ) log . error ( e . getMessage ( ) , e ) ; } } return null ; }
target:  load the data full into the t.