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java.lang.NullPointerException: 	at java.lang.String.(String.java:194)	at oracle.sql.CharacterSet.AL32UTF8ToString(CharacterSet.java:1517)	at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:589)	at oracle.jdbc.driver.DBConversion.CharBytesToString(DBConversion.java:542)	at oracle.jdbc.driver.T4CTTIoauthenticate.receiveOauth(T4CTTIoauthenticate.java:822)	at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:362)	at oracle.jdbc.driver.PhysicalConnection.(PhysicalConnection.java:439)	at oracle.jdbc.driver.T4CConnection.(T4CConnection.java:165)	at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:35)	at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:801)	at java.sql.DriverManager.getConnection(DriverManager.java:579)	at java.sql.DriverManager.getConnection(DriverManager.java:221)	at cr.ac.una.info.p3.accesodatos.Conexion.conectarme(Conexion.java:26)	at cr.ac.una.info.p3.accesodatos.ADAutor.insertar(ADAutor.java:29)	at Principal.Principal.main(Principal.java:23)