Question

我正在尝试在运行时创建EntityManager，这样我就可以从config.xml中设置不同的用户名和密码

以下是创建EntityManager的代码

map.put(PersistenceUnitProperties.JDBC_USER,  SystemConfig.getConfig().getString("jdbcUser"));
map.put(PersistenceUnitProperties.JDBC_PASSWORD, SystemConfig.getConfig().getString("jdbcPassword"));
map.put(PersistenceUnitProperties.JDBC_URL, SystemConfig.getConfig().getString("jdbcUrl"));
map.put(PersistenceUnitProperties.JDBC_DRIVER, "net.sourceforge.jtds.jdbc.Driver");
EntityManager eMgr = Persistence.createEntityManagerFactory("myPU", map).createEntityManager();

我在unix中的程序结构：〜/测试/ myProgram.jar 〜/ test / lib / * .jar（所有库和jdbc.jar）

当我在文件夹/ test /中运行程序时程序运行正常但是当我在root下运行程序时〜/我得到Exception [EclipseLink-4021]。知道为什么??

注意：最终我需要使用cron job来安排程序。

[EL Info]: 2013-05-06 12:10:18.989--ServerSession(1729331687)--EclipseLink, version: Eclipse Persistence Services - 2.4.1.v20121003-ad44345
[EL Severe]: ejb: 2013-05-06 12:10:19.002--ServerSession(1729331687)--Exception [EclipseLink-4021] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Unable to acquire a connection from driver [net.sourceforge.jtds.jdbc.Driver], user [null] and URL [null].  Verify that you have set the expected driver class and URL.  Check your login, persistence.xml or sessions.xml resource.  The jdbc.driver property should be set to a class that is compatible with your database platform
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-4021] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Unable to acquire a connection from driver [net.sourceforge.jtds.jdbc.Driver], user [null] and URL [null].  Verify that you have set the expected driver class and URL.  Check your login, persistence.xml or sessions.xml resource.  The jdbc.driver property should be set to a class that is compatible with your database platform
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:602)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:278)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:304)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:282)
        at dcsmailcheck.MailResend.<init>(MailResend.java:61)
        at dcsmailcheck.Main.main(Main.java:49)
Caused by: Exception [EclipseLink-4021] (Eclipse Persistence Services - 2.4.1.v20121003-ad44345): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Unable to acquire a connection from driver [net.sourceforge.jtds.jdbc.Driver], user [null] and URL [null].  Verify that you have set the expected driver class and URL.  Check your login, persistence.xml or sessions.xml resource.  The jdbc.driver property should be set to a class that is compatible with your database platform
        at org.eclipse.persistence.exceptions.DatabaseException.unableToAcquireConnectionFromDriverException(DatabaseException.java:376)
        at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:91)
        at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
        at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:685)
        at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:215)
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:542)
        ... 6 more

Answer 1

由于您的代码在〜/ test文件夹中工作，SystemConfig.getConfig()似乎无法从该位置加载属性。确保已将属性的路径添加到CLASSPATH。

在运行时创建EntityManager时错误EclipseLink-4021为什么？

1 个答案: