Salve a tutti,

Tramite un JDBC sto collegando GlassFish a MYSQl, solo che quando vado a creare il pool, la connessione, (dopo avere inserito cioè questi parametri: pool name / Resource Type / Database Driver Vendor) mi compare un errore di questo tipo:

HTTP Status 500 - Internal Server Error

the server encountered an internal error that prevented it from fulfilling this request.
java.lang.IllegalStateException: getOutputStream() has already been called for this response
The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 4.1.1 logs.


Come posso risolverlo? Grazie