Question

我试图运行基于JPA的示例项目。我一直从标题中得到错误。

我看了看这里： No Persistence provider for EntityManager named

但在那里找不到有效的解决方案。

这是我的pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<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>~path.example</groupId>
    <artifactId>example</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>ejb3-persistence</artifactId>
            <version>3.3.2.Beta1</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>4.3.9.Final</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jst.server.generic</groupId>
            <artifactId>oc4j</artifactId>
            <version>1.5.105-v200709061325</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.0.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>4.2.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate.common</groupId>
            <artifactId>hibernate-commons-annotations</artifactId>
            <version>4.0.1.Final</version>
            <classifier>tests</classifier>
        </dependency>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.0-api</artifactId>
            <version>1.0.1.Final</version>
        </dependency>
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.0.0.GA</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.4</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.1.0.CR2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.4</version>
        </dependency>
        <dependency>
            <groupId>org.jboss.spec</groupId>
            <artifactId>jboss-javaee-6.0</artifactId>
            <version>1.0.0.Final</version>
            <type>provided</type>
            <scope>pom</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.arquillian.junit</groupId>
            <artifactId>arquillian-junit-container</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.spec</groupId>
            <artifactId>jboss-javaee-6.0</artifactId>
            <version>1.0.0.Final</version>
            <type>pom</type>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.arquillian.container</groupId>
            <artifactId>arquillian-weld-ee-embedded-1.1</artifactId>
            <version>1.0.0.CR3</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.jboss.weld</groupId>
            <artifactId>weld-core</artifactId>
            <version>1.1.5.Final</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-simple</artifactId>
            <version>1.6.4</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.jboss.arquillian</groupId>
                <artifactId>arquillian-bom</artifactId>
                <version>1.1.8.Final</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

我可能有一些我不需要的依赖。由于我没有经验，我必须诚实地承认，我非常绝望，并寻找任何可能的答案，并在此过程中我添加了一些可能根本不使用的依赖。

这是应该创建EntityManager的类

package ~path.examples.service;

import ~path.examples.testjpa.domain.Person;

import javax.persistence.*;

/**
 * Created by ME on 2015-04-22.
 */
public class JpaTest {
    public static void main(String args[]) {
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("jpaTest");
        EntityManager em = entityManagerFactory.createEntityManager();
        EntityTransaction userTransaction = em.getTransaction();

        userTransaction.begin();
        Person person = new Person();
        person.setFirstName("Charles");
        person.setSurname("Dickens");
        em.persist(person);
        userTransaction.commit();
        em.close();
        entityManagerFactory.close();
    }
}

此外：

我很确定所有文件都在适当的位置，我也遇到了一些问题，但我似乎已经消除了这个问题（其他错误比之前更多）:)）
< / LI>
这可能是我失踪的明显事实，提前感谢您的帮助！

编辑：问题很可能出在persistance.xml文件中，所以在这里（感谢指出）。该文件的位置是src / main / resources / META-INF

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
             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">
    <persistence-unit name="JpaTest" transaction-type="RESOURCE_LOCAL">
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
        <class>~path.examples.testjpa.domain.Person</class>
        <properties>
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="hibernate.dialect" value="org.hibernate.dialect.DerbyDialect" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
        </properties>

    </persistence-unit>
</persistence>

Answer 1

也许你没有将Hibernate jar添加到项目类路径中？缺少提供程序jar（在本例中为Hibernate）不会显示编译错误，因为它们在运行时是必需的。

Answer 2

您需要更改：

<provider>org.hibernate.ejb.HibernatePersistence</provider>

为：

<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

没有为EntityManager命名的持久性提供程序（Hibernate）

2 个答案: