Question

我有一个使用＆＃34; 4.3.11.Final＆＃34;的Maven项目。版本Hibernate核心和实体管理器，一切都很好。今天，我将我的pom.xml上的这个依赖项的版本更改为最新版本（5.2.1.Final），我的项目突然失败了：

线程中的异常＆＃34; main＆＃34; javax.persistence.PersistenceException：
没有EntityManager的持久性提供程序名为wiki。

版本号是我所做的唯一更改。我需要使用Hibernate 5进行特定设置吗？我在5.0 Migration Guide上找不到任何内容。

以下是我的文件，我正在执行的课程：

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

public final class SchemeExport {

    private static final String PERSISTENCE_UNIT = "wiki";

    public static void main(String... args){
        // fails on the line below
        EntityManagerFactory factory = Persistence.createEntityManagerFactory(PERSISTENCE_UNIT);
        EntityManager manager = factory.createEntityManager();
        manager.close();
        factory.close();
    }
}

我的持久性文件：

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" 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">
    <persistence-unit name="wiki">

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

        <class>model.Article</class>
        <class>model.ArticleMeta</class>
        <class>model.Category</class>
        <class>model.Collaborator</class>
        <exclude-unlisted-classes>true</exclude-unlisted-classes>

        <properties>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/wiki?useUnicode=true&amp;useJDBCCompliantTimezoneS‌hift=true&amp;useLegacyDatetimeCode=false&amp;serverTimezone=UTC"/>
            <property name="javax.persistence.jdbc.user" value="root"/>
            <property name="javax.persistence.jdbc.password" value="root"/>

            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect"/>
            <property name="hibernate.show_sql" value="true"/>
            <property name="hibernate.format_sql" value="true"/>

            <!--<property name="hibernate.hbm2ddl.auto" value="update"/>-->
            <property name="javax.persistence.schema-generation.database.action" value="drop-and-create"/>
        </properties>
    </persistence-unit>
</persistence>

我的pom.xml＆＃39; （省略组/工件属性）：

<?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>

    <properties>
        <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.3</version>
        </dependency>
        <!--<dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.3.11.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>4.3.11.Final</version>
        </dependency>-->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>7.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <compilerArguments>
                        <endorseddirs>${endorsed.dir}</endorseddirs>
                    </compilerArguments>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.3</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <version>2.6</version>
                <executions>
                    <execution>
                        <phase>validate</phase>
                        <goals>
                            <goal>copy</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${endorsed.dir}</outputDirectory>
                            <silent>true</silent>
                            <artifactItems>
                                <artifactItem>
                                    <groupId>javax</groupId>
                                    <artifactId>javaee-endorsed-api</artifactId>
                                    <version>7.0</version>
                                    <type>jar</type>
                                </artifactItem>
                            </artifactItems>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

Answer 1

您在persistence.xml中使用了错误/较旧的持久性提供程序。所以替换

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

与

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

为什么我为EntityManager＆＃34;获得了＃34; No Persistence提供程序？什么时候更新到5.0版？

1 个答案: