我是
Java EE的初学者.今天我按照本教程尝试学习Java EE：
http://netbeans.org/kb/docs/javaee/javaee-gettingstarted.html
http://netbeans.org/kb/docs/javaee/javaee-gettingstarted.html
它基本上教授如何使用Netbeans从Java Web类别创建Web应用程序.
当我运行该应用程序时,我得到了Build Failed错误消息,如下所示：
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.
解决方法
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>