I am making a connection with java web and MySQL, with GlassFish server, but when making the configuration in http://localhost:4848/common/index.jsf in JDBC Connection Pools I get the following error:
HTTP Status 500 - Internal Server Error
type Exception report
messageInternal Server Error
descriptionThe server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.IllegalStateException: getOutputStream() has already been called for this response
note The full stack traces of the exception and its root causes are available in the GlassFish Server Open Source Edition 4.1.1 logs.