JavaEE项目部署失败

我是 Java EE 的初学者。今天我尝试按照本教程学习 Java EE:
http://netbeans.org/kb/docs/javaee/javaee-gettingstarted.html

它主要教授如何使用 Netbeans 从 Java Web 类别创建 Web 应用程序。

当我运行应用程序时，我收到了这样的 Build Failed 错误消息:

  WebApplication1/build/web&name=WebApplication1&contextroot=/WebApplication1&force=true failed on GlassFish Server 3+

     Error occurred during deployment: Exception while preparing the app : Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException

    Internal Exception: 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.

    Error Code: 0. Please see server.log for more details.
   WebApplication1/nbproject/build-impl.xml:721: The module has not been deployed.
    See the server log for details.
    BUILD FAILED (total time: 2 seconds)

我已经打开 glassfish 服务器并在创建此项目时选择 glassfish 作为服务器，但看起来服务器拒绝连接。

最佳答案

转到 persistence.xml 文件，并在其中添加带有数据库连接池名称的“jta-data-source”标记。

您可以在 Glassfish 管理控制台中找到连接池的名称。资源->JDBC->JDBC 连接池

<persistence-unit name="Project-name">
    <jta-data-source>jdbc/mysqlpool</jta-data-source>
    <class>....</class>
</persistence-unit>