JavaEE项目无法部署

Question

我是Java EE的初学者.今天我尝试通过以下教程学习Java EE: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.

Answer 1

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>

Answer 2

Java DB在端口 1527 上运行。看起来它没有在您的情况下运行。

单击 NetBeans IDE 中的“输出”选项卡并查看“Java DB 数据库进程”控制台。

您应该看到以下几行：

Tue Jul 03 20:25:43 BST 2012 : Security manager installed using the Basic server security policy.
Tue Jul 03 20:25:44 BST 2012 : Apache Derby Network Server - 10.8.1.2 - (1095077) started and ready to accept connections on port 1527

如果您没有看到这些行，请尝试调查 Java DB 进程未启动的原因。