NetBeans创建连接池的问题，请指教
NetBeans创建连接池时遇到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.
GlassFish Server Open Source Edition 4.1.1
这个问题，在点击next之后出现的。而我在直接访问MYSQL数据库是没有问题的，求具体解决步骤
