java - why hibernate no update field? -

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i'm updating field in hibernate oracle database, doesn't. why hibernate doesn't update field leido? 

    if (mensajeid.getleido().equals("false")) {          transaction tx = main.getsesion().begintransaction();         mensajeid.setleido("true");         mensaje mensaje = listamensajesrecibidos.getselectedvalue();         mensaje.setid(mensajeid);         mensaje.setusuariobyemisor(mensaje.getusuariobyemisor());         mensaje.setusuariobyreceptor(mensaje.getusuariobyreceptor());         main.getsesion().update(mensaje);                    tx.commit();     }

it seems try use update() method not managed instance. should use saveorupdate() or save() in case.

if think entity in db instance not connected session should use merge() before.


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