无法通过PostgreSQL获取数据源。不能使用JPA EntityManager

Question

我有下一个问题：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
  <persistence-unit name="PruebaPersitenciaPU" transaction-type="JTA">
    <jta-data-source>data_cotratacion</jta-data-source>
    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties/>
  </persistence-unit>

@GET
    public String crearPersona(
            @QueryParam("id") String id,
            @QueryParam("name") String name,
            @QueryParam("gender") String gender,
            @QueryParam("date") String date){
        Persona p = new Persona();
        p.setId(id);
        p.setName(name);
        p.setGender(gender);
        p.setDate(stringToDate(date));
        try {        
            EntityManagerFactory emf = Persistence.createEntityManagerFactory("PruebaPersitenciaPU");
            EntityManager em = emf.createEntityManager();
            
            em.getTransaction().begin();
            em.persist(p);
            em.getTransaction().commit();
        
            return "Usuario Creado "+id;
        } catch (Exception e) {
            return "Usuario no creado error: "+e;
        }
    }

但是尝试这个会发送给我这个错误：

Usuario no creado错误:javax.Persistence.persistenceException:Exception[EclipseLink-7060]（Eclipse Persistence Services-2.5.v20140319-9AD6ABD):org.Eclipse.Persistence.exceptions.ValidationException异常描述：无法获取数据源[data_cotratacion]。内部异常：javax.naming.namingException：在SerialContext[myenv={java.naming.factory.initial=com.sun.enterprise.naming.impl.SerialinitContextFactory,java.naming.factory.state=com.sun.corba.ee.impl.presentation.rmi.jndistateFactoryImpl,java.naming.factory.url.pkgs=com.sun.enterprise.naming}中查找“

Answer 1

听起来好像没有配置名为data_cotratacion的JDBC数据源。您需要在应用程序服务器上配置此JDBC资源。

或者，您需要使用netbeans中的向导创建持久化单元，进入菜单to File>New File，然后在左侧框中选择persistence，在右侧框中选择persistence unit。