Question

我有这个peristence.xml部署在WildFly上：

  <persistence-unit name="optaweb-employee-rostering-persistence-unit" transaction-type="JTA">
    <jta-data-source>java:jboss/datasources/ExampleDS</jta-data-source>
    ...
  </persistence-unit>

现在，我想在具有直接JDBC连接的纯Java应用程序中重用它，所以没有JNDI ：

    Map<String, String> properties = new HashMap<>();
    properties.put("javax.persistence.jdbc.driver", "org.hsqldb.jdbcDriver");
    properties.put("javax.persistence.jdbc.url", "jdbc:hsqldb:mem:testdb");
    properties.put("javax.persistence.jdbc.user", "sa");
    properties.put("javax.persistence.jdbc.password", "");

    // Overwrites transaction-type successfully 
    properties.put("javax.persistence.transactionType", "RESOURCE_LOCAL");

    // TODO overwrite jta-data-source

    EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory(
            "optaweb-employee-rostering-persistence-unit", properties);

如何覆盖jta-data-source？

我尝试了许多JPA属性来覆盖jta-data-source，但没有成功：

    // Overwrites jta-data-source
    // but triggers a JNDI lookup of "" which crashes of course
    properties.put("javax.persistence.jtaDataSource", "");
    // Does not overwrite jta-data-source
    properties.put("javax.persistence.jtaDataSource", null);

    // Does not overwrite jta-data-source
    properties.put("javax.persistence.nonJtaDataSource", "foo");

我还尝试了一些特定于休眠的属性，例如hibernate.transaction.coordinator_class和hibernate.connection.datasource，它们的失败结果与上述相同。

Answer 1

据我从Hibernate ORM的来源（尤其是org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl#EntityManagerFactoryBuilderImpl(org.hibernate.jpa.boot.spi.PersistenceUnitDescriptor, java.util.Map, java.lang.ClassLoader, org.hibernate.boot.registry.classloading.spi.ClassLoaderService)）得知，这些特定的JPA设置会覆盖hibernate.properties或您将提供给Persistence.createEntityManagerFactory的Map中的设置

这可能是一个愚蠢的主意，但是您是否不能做相反的事情，即不是在持久性单元中设置数据源，而是通过WildFly应用程序中的hibernate.properties文件设置呢？然后，您可以在普通的Java应用程序中执行任何操作。

JPA：通过覆盖数据源，在JSE和JUnit中将jp-data-source与persistence.xml一起使用

1 个答案: