使用Hibernate作为提供者的JPA 2.0 - 异常：没有EntityManager的持久性提供者 [英] JPA 2.0 using Hibernate as provider - Exception: No Persistence provider for EntityManager

问题描述

我试图通过遵循Hibernate EntityManager中的信息设置一个简单的jpa 2.0项目文档。我已经在这上面待了好几个小时，但无论我做什么，在尝试创建EntityManagerFactory时总会得到这个异常：

 线程main中的异常javax.persistence.PersistenceException：否EntityManager的持久性提供程序名为manager1 $ b $在javax.persistence.Persistence.createEntityManagerFactory（Persistence.java:54）$ b $在javax.persistence。在se.mycomp.UserTest.main（UserTest.java:9）
  

我发现了很多关于这个异常的类似问题，但是没有解决方案可以使用。我在这里做错了什么？

目录结构

 。 
├──pom.xml 
└──src 
├──main 
│├──java 
││└──se 
│ │└──mycomp $ b $││├──UserTest.java $ b $││└──域名
││└──User.java 
│└──资源
│├──META-INF 
││└──persistence.xml 
│└──log4j.properties 
└──test 
└──java 
  

我的 persistence.xml

 < 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
版本= 2.0 > 
< persistence-unit name =manager1transaction-type =RESOURCE_LOCAL> 
< provider> org.hibernate.ejb.HibernatePersistence< / provider> 
< class> se.mycomp.domain.User< / class> 
<属性> 
< property name =hibernate.dialectvalue =org.hibernate.dialect.MySQL5InnoDBDialect/> 
< property name =hibernate.hbm2ddl.autovalue =create-drop/> 
 
< property name =javax.persistence.jdbc.drivervalue =com.mysql.jdbc.Driver/> 
< property name =javax.persistence.jdbc.urlvalue =jdbc：mysql：// localhost / test/> 
< property name =javax.persistence.jdbc.uservalue =test/> 
< property name =javax.persistence.jdbc.passwordvalue =1234/> 
< / properties> 
< / persistence-unit> 
< /余辉> 
  

我的 pom.xml

 < project xmlns =http://maven.apache.org/POM/4.0.0 xmlns：xsi =http://www.w3.org/2001/XMLSchema-instance
 xsi：schemaLocation =http://maven.apache.org/POM/4.0.0 http：// maven .apache.org / XSD /行家-4.0.0.xsd> 
< modelVersion> 4.0.0< / modelVersion> 
 
< groupId> se.lil.tryjpa< / groupId> 
< artifactId> try-jpa< / artifactId> 
< version> 1.0-SNAPSHOT< / version> 
<包装> jar< / packaging> 
 
<属性> 
< project.build.sourceEncoding> UTF-8< /project.build.sourceEncoding> 
 
< hibernate-core.version> 3.6.4.Final< /hibernate-core.version> 
< mysql-connector-java.version> 5.1.16< /mysql-connector-java.version> 
< slf4j.version> 1.6.1< /slf4j.version> 
< log4j.version> 1.6.1< /log4j.version> 
< / properties> 
 
<依赖关系> 
 <！ -  HIBERNATE DEPENDENCIES  - > 
< dependency> 
< groupId> org.hibernate< / groupId> 
< artifactId> hibernate-core< / artifactId> 
< version> $ {hibernate-core.version}< / version> 
< /依赖关系> 
 
<！ -  MYSQL相关内容 - > 
< dependency> 
< groupId> mysql< / groupId> 
< artifactId> mysql-connector-java< / artifactId> 
< version> $ {mysql-connector-java.version}< / version> 
< /依赖关系> 
 
 <！ - 记录相关性 - > 
< dependency> 
< groupId> org.slf4j< / groupId> 
< artifactId> slf4j-api< / artifactId> 
< version> $ {slf4j.version}< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.slf4j< / groupId> 
< artifactId> slf4j-log4j12< / artifactId> 
< version> $ {log4j.version}< / version> 
< /依赖关系> 
< /依赖关系> 
 
< build> 
< plugins> 
< plugin> 
< groupId> org.apache.maven.plugins< / groupId> 
< artifactId> maven-compiler-plugin< / artifactId> 
< version> 2.3.2< / version> 
<配置> 
< source> 1.6< / source> 
< target> 1.6< / target> 
< optimize> true< / optimize> 
< debug> true< / debug> 
< / configuration> 
< / plugin> 
< plugin> 
< groupId> org.apache.maven.plugins< / groupId> 
< artifactId> maven-eclipse-plugin< / artifactId> 
< version> 2.8< / version> 
<配置> 
< downloadSources> true< / downloadSources> 
< / configuration> 
< / plugin> 
< / plugins> 
< / build> 
  

UserTest.java

  public class UserTest {
 public static void main（String [ ] args）{
 EntityManagerFactory emf = Persistence.createEntityManagerFactory（manager1）; 
 EntityManager em = emf.createEntityManager（）; 
} 
} 
  

解决方案

也许你想念你的pom.xml依赖关系中的Provider类或它的一个依赖项？

你给hibernate文档的链接说你还应该添加

< project ...>
...
< dependencies>
< dependency>
< groupId> org.hibernate< / groupId>
< artifactId> hibernate-entitymanager< / artifactId>
< version> $ {hibernate-core-version}< / version>
< /依赖关系>
< /依赖关系>
< / project>


添加到您的pom.xml中

I'm trying to set up a simple jpa 2.0 project by following the information in the Hibernate EntityManager documentation. I've been on this for hours now, but no matter what I do I always get this exception when I try to create a EntityManagerFactory:

Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named manager1
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:32)
    at se.mycomp.UserTest.main(UserTest.java:9)

I've found quite a few similar questions regarding this exception, but no solutions that I am able to get to work. What am I doing wrong here?

directory structure

.
├── pom.xml
└── src
    ├── main
    │   ├── java
    │   │   └── se
    │   │       └── mycomp
    │   │           ├── UserTest.java
    │   │           └── domain
    │   │               └── User.java
    │   └── resources
    │       ├── META-INF
    │       │   └── persistence.xml
    │       └── log4j.properties
    └── test
        └── java

my persistence.xml

<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="manager1" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>se.mycomp.domain.User</class> 
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>

            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost/test"/>
            <property name="javax.persistence.jdbc.user" value="test"/>
            <property name="javax.persistence.jdbc.password" value="1234"/>
        </properties>
    </persistence-unit>
</persistence>

my pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>se.lil.tryjpa</groupId>
<artifactId>try-jpa</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>jar</packaging>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <hibernate-core.version>3.6.4.Final</hibernate-core.version>
    <mysql-connector-java.version>5.1.16</mysql-connector-java.version>
    <slf4j.version>1.6.1</slf4j.version>
    <log4j.version>1.6.1</log4j.version>
</properties>

<dependencies>
    <!-- HIBERNATE DEPENDENCIES -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>${hibernate-core.version}</version>
    </dependency>

    <!-- MYSQL DEPENDENCIES -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql-connector-java.version}</version>
    </dependency>

    <!-- Logging Dependencies -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>${slf4j.version}</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>${log4j.version}</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.6</source>
                <target>1.6</target>
                <optimize>true</optimize>
                <debug>true</debug>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-eclipse-plugin</artifactId>
            <version>2.8</version>
            <configuration>
                <downloadSources>true</downloadSources>
            </configuration>
        </plugin>
    </plugins>
</build>

UserTest.java

public class UserTest {
    public static void main(String[] args) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("manager1");
        EntityManager em = emf.createEntityManager();
    }
}

解决方案

Maybe you miss the Provider class or one of its dependencies in your pom.xml dependencies?

The link you give to the hibernate docs says that you should also add

<project ...>
  ...
  <dependencies>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>${hibernate-core-version}</version>
    </dependency>
  </dependencies>
</project>

to your pom.xml

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