播放 2.6 Inject JPAApi error "No Persistence provider for EntityManager named defaultPersistenceUnit"答案

【问题标题】：Play 2.6 Inject JPAApi error "No Persistence provider for EntityManager named defaultPersistenceUnit"播放 2.6 Inject JPAApi error "No Persistence provider for EntityManager named defaultPersistenceUnit"
【发布时间】：2018-08-29 13:40:37
【问题描述】：

我在 play 2.6.15 应用程序中使用 Ebean。但我没有在 ebean 中找到“getSingleResult”函数。我正在尝试使用 JPAApi。当控制器尝试注入 JPAApi 时，我收到错误 No Persistence provider for EntityManager named defaultPersistenceUnit

controllers.PublicController.java

public class PublicController extends Controller {

    @Inject
    public PublicController(JPAApi apaApi) {}

}

build.sbt

lazy val server = (project in file("."))
  .enablePlugins(BuildInfoPlugin, PlayJava, PlayEbean)
  .settings(
    libraryDependencies += guice,
    libraryDependencies ++= Seq(
      ...
      javaJpa,
      "org.hibernate" % "hibernate-entitymanager" % "5.3.1.Final"
  ),
  fork in run := true
)

/conf/META-INF/persistence.xml

<persistence 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"
         version="2.1">

  <persistence-unit name="defaultPersistenceUnit" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <non-jta-data-source>DefaultDS</non-jta-data-source>
    <properties>
      ...
    </properties>
  </persistence-unit>

</persistence>

application.conf

db {
  default {
    driver = com.mysql.jdbc.Driver
    jndiName = DefaultDS
    url = "***"
    username = "***"
    password = "***"
    hikaricp {
      minimumIdle = ${fixedConnectionPool}
      maximumPoolSize = ${fixedConnectionPool}
    }
  }
}
jpa.default = defaultPersistenceUnit

我已经检查了所有内容，但我不明白我做错了什么。请帮忙。谢谢！

【问题讨论】：

标签： playframework-2.6

【解决方案1】：

解决了。是模型链接的问题，OneToMany 和 ManyToOne 链接不正确

【讨论】：