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我正试图用Java和Tomcat开发一个简单的其余API项目。 HTTP请求正常工作,但我通过实现数据库MySQL来存储数据,从而发现了很多问题。这是我的persistence.xml文件,即位于爪哇资源/ META-INF:没有用于Tomcat的实体管理器的持久性提供者
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="PERSISTENCE">
<description> Hibernate JPA Configuration Example</description>
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
<class>com.resourceserver.Person</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:mysql://localhost:3306/RESTResourceServer" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="password" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
这是我PersonDAO.java和JPAUtil.java类:
public class PersonDao {
EntityManager entityManager;
public PersonDao() {
entityManager = JPAUtil.getEntityManagerFactory().createEntityManager();
}
public void storePerson(Person person) {
entityManager.persist(person);
// people.add(person);
}
public void deletePerson(Person person) {
entityManager.remove(person);
// people.remove(person);
}
public Person findPersonId(int id) {
/*
* for (Person person : people) { if (person.getId() == id) { return person; } }
*/
return null;
}
@SuppressWarnings("unchecked")
public List<Person> getAllUsers() {
Query query = entityManager.createQuery("Select p From People p ");
return query.getResultList();
// return people;
}
}
public class JPAUtil {
private static final String PERSISTENCE_UNIT_NAME = "PERSISTENCE";
private static EntityManagerFactory factory;
public static EntityManagerFactory getEntityManagerFactory() {
if (factory == null) {
factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
}
return factory;
}
public static void shutdown() {
if (factory != null) {
factory.close();
}
}
}
而且在我的Endpoint中,我简单地使用PersonDao persona = new PersonDao()来执行操作;我错在哪里?
谢谢您的回复。我应该在哪里提供这些信息?在POM中? –
是的。您必须将hibernate依赖项添加到hibernate-entitymanager到依赖项部分。 org.hibernate作为 的Hibernate的EntityManager 5.2.11.Final –
fhossfel
我已经该行代码,也是行家的更新之后,我同样的问题... –