我试图通过遵循Hibernate EntityManager 文档中的信息来建立一个简单的jpa 2.0项目。我已经花了几个小时了,但是无论我做什么,当我尝试创建EntityManagerFactory时总是会遇到此异常:
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)
关于此异常,我发现了很多类似的问题,但是没有能够解决的解决方案。我在这里做错了什么?
目录结构
. ├── pom.xml └── src ├── main │ ├── java │ │ └── se │ │ └── mycomp │ │ ├── UserTest.java │ │ └── domain │ │ └── User.java │ └── resources │ ├── 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" 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>
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/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(); } }
也许您错过了pom.xml依赖项中的Provider类或其依赖项之一?
您提供给hibernate文档的链接说您还应该添加
<project ...> ... <dependencies> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>${hibernate-core-version}</version> </dependency> </dependencies> </project>
到你的pom.xml