運行如下因素錯誤被表明,當一試,堅持數據:麻煩配置播放2與JPA(持久性)
[PersistenceException: [PersistenceUnit: update] class or package not found]
In C:\Users\Johann\Desktop\SODET\play-2.1.1\todolist\app\models\Stream.java at line 32.
32 EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("update");
這是Stream.java(模型)
package models;
import javax.persistence.Entity;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Id;
import javax.persistence.Persistence;
import com.restfb.Facebook;
@Entity
public class Stream {
@Facebook
@Id
public String post_id;
@Facebook
public String created_time;
@Facebook
public String message;
@Facebook
public String permalink;
@Override
public String toString() {
return String.format("%s, %s, %s, %s", created_time, message, permalink, post_id);
}
public void save(){
EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("update");
EntityManager entityManager = entityManagerFactory.createEntityManager();
entityManager.getTransaction().begin();
entityManager.persist(this);
entityManager.getTransaction().commit();
entityManager.close();
}
}
的的persistence.xml文件是在conf/META-INF目錄:
<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="update" transaction-type="RESOURCE_LOCAL">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<non-jta-data-source>DefaultDS</non-jta-data-source>
<class>models.Stream</class>
<class>models.FacebookUser</class>
<class>models.Comment</class>
<properties>
<property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect"/>
</properties>
</persistence-unit>
</persistence>
這是Build.scala
import sbt._
import Keys._
import play.Project._
object ApplicationBuild extends Build {
val appName = "todolist"
val appVersion = "1.0-SNAPSHOT"
val appDependencies = Seq(
// Add your project dependencies here,
"com.restfb" % "restfb" % "1.6.11",
"mysql" % "mysql-connector-java" % "5.1.25",
"org.hibernate" % "hibernate-entitymanager" % "4.2.1.Final",
javaCore,
javaJdbc,
javaJpa
)
val main = play.Project(appName, appVersion, appDependencies).settings(
// Add your own project settings here
)
}
我看了看文檔,發現關於什麼......
提前感謝!在application.conf
**注意**:我對Hibernate +持久性知之甚少。你應該能夠像這樣獲得'EntityManager':'EntityManager manager = JPA.em();'在Play中。然後你可以調用'manager.persist(this);'等。這適用於我,但我在'persistence.xml'中有一個額外的屬性:' '。另外,可能與您的問題無關,但由於您使用的是MySQL,因此您應該將方言更改爲'org.hibernate.dialect.MySQLDialect',而不是使用'H2Dialect'。 –
Aerus