java - 无法获取连接，数据源无效 - Netbeans、MySQL

Question

我正在关注 Netbeans 站点的教程:

https://netbeans.org/kb/docs/web/mysql-webapp.html

一切都工作正常，直到这一步:实现 JSTL 代码第 4 步(应显示列表)我收到以下错误:

javax.servlet.ServletException: javax.servlet.jsp.JspException: 
Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: java.net.ConnectException : Error connecting to server localhost on port 1527 with message Connection refused."
root cause

javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "java.sql.SQLException: Error in allocating a connection. Cause: Connection could not be allocated because: java.net.ConnectException :
         Error connecting to server localhost on port 1527 with message Connection refused."

注意 GlassFish Server 开源版 4.0 日志中提供了异常的完整堆栈跟踪及其根本原因。

我想 netbeans 仍然尝试连接到 Derby DB。如何将其更改为 MySQL 数据库？ 我正在使用 Java EE7、MySQL、Netbeans、Glassfish 4

Answer 1

堆栈跟踪表明 MySQL 数据库未在端口 1527 上运行

参见https://netbeans.org/kb/docs/ide/mysql.html