Question

方案如下。我在Eclipse上做一个J2EE项目。该项目是用Maven创建的。我正在尝试启动并运行我的单元测试，当我尝试创建EntityManager时，它会引发异常：

javax.persistence.PersistenceException：没有持久性提供程序 EntityManager名为primary。

@BeforeClass
public static void setUpClass() throws Exception {
    Logger.getLogger("org").setLevel(Level.ALL);

    EntityManagerFactory factory = Persistence.createEntityManagerFactory("primary.");
        em = (EntityManager) factory.createEntityManager();
}

所以我通过从Persistent类中获取URLClassLoader来检查运行时类路径，其中包括：

/卷/ SVEN的/ dev / Eclipse的工作区/电子虚拟/ EJB /目标/测试类/ /卷/ SVEN的/ dev / Eclipse的工作区/电子虚拟/ EJB /目标/类/ /Volumes/SVEN/dev/jar_repo/mysql-connector-java-5.1.42/mysql-connector-java-5.1.42-bin.jar

META-INF目录位于它所属的位置：

E-虚拟/ EJB /目标/测试类/ META-INF / persistence.xml中和电子虚拟/ EJB /目标/类/ META-INF / persistence.xml中

我似乎只能通过以下方式访问persistence.xml：的System.out.println（的getClass（）的getResource（ “../../../../../ META-INF / persistence.xml中”））;

这真让我大吃一惊。我在这里缺少什么？

我已经清理过我的两次了。我真的很想念。

这是类路径的完整转储：

以下是完整列表：

/Volumes/SVEN/dev/eclipse-workspace/e-virtual/ejb/target/test-classes/
/Volumes/SVEN/dev/eclipse-workspace/e-virtual/ejb/target/classes/
/Volumes/SVEN/dev/jar_repo/mysql-connector-java-5.1.42/mysql-connector-java-5.1.42-bin.jar
/Users/sven/.m2/repository/org/jboss/spec/javax/ejb/jboss-ejb-api_3.1_spec/1.0.2.Final/jboss-ejb-api_3.1_spec-1.0.2.Final.jar
/Users/sven/.m2/repository/javax/enterprise/cdi-api/1.0-SP4/cdi-api-1.0-SP4.jar
/Users/sven/.m2/repository/org/jboss/spec/javax/interceptor/jboss-interceptors-api_1.1_spec/1.0.1.Final/jboss-interceptors-api_1.1_spec-1.0.1.Final.jar
/Users/sven/.m2/repository/javax/inject/javax.inject/1/javax.inject-1.jar
/Users/sven/.m2/repository/org/hibernate/javax/persistence/hibernate-jpa-2.0-api/1.0.1.Final/hibernate-jpa-2.0-api-1.0.1.Final.jar
/Users/sven/.m2/repository/org/hibernate/hibernate-validator/4.2.0.Final/hibernate-validator-4.2.0.Final.jar
/Users/sven/.m2/repository/javax/validation/validation-api/1.0.0.GA/validation-api-1.0.0.GA.jar
/Users/sven/.m2/repository/org/slf4j/slf4j-api/1.6.1/slf4j-api-1.6.1.jar
/Users/sven/.m2/repository/junit/junit/4.11/junit-4.11.jar
/Users/sven/.m2/repository/org/hamcrest/hamcrest-core/1.3/hamcrest-core-1.3.jar
/Users/sven/.m2/repository/org/jboss/arquillian/junit/arquillian-junit-container/1.1.0.Final/arquillian-junit-container-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/junit/arquillian-junit-core/1.1.0.Final/arquillian-junit-core-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/test/arquillian-test-api/1.1.0.Final/arquillian-test-api-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/core/arquillian-core-api/1.1.0.Final/arquillian-core-api-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/test/arquillian-test-spi/1.1.0.Final/arquillian-test-spi-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/core/arquillian-core-spi/1.1.0.Final/arquillian-core-spi-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/container/arquillian-container-test-api/1.1.0.Final/arquillian-container-test-api-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/shrinkwrap/shrinkwrap-api/1.1.2/shrinkwrap-api-1.1.2.jar
/Users/sven/.m2/repository/org/jboss/arquillian/container/arquillian-container-test-spi/1.1.0.Final/arquillian-container-test-spi-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/core/arquillian-core-impl-base/1.1.0.Final/arquillian-core-impl-base-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/test/arquillian-test-impl-base/1.1.0.Final/arquillian-test-impl-base-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/container/arquillian-container-impl-base/1.1.0.Final/arquillian-container-impl-base-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/config/arquillian-config-api/1.1.0.Final/arquillian-config-api-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/config/arquillian-config-impl-base/1.1.0.Final/arquillian-config-impl-base-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/container/arquillian-container-test-impl-base/1.1.0.Final/arquillian-container-test-impl-base-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/shrinkwrap/shrinkwrap-impl-base/1.1.2/shrinkwrap-impl-base-1.1.2.jar
/Users/sven/.m2/repository/org/jboss/shrinkwrap/shrinkwrap-spi/1.1.2/shrinkwrap-spi-1.1.2.jar
/Users/sven/.m2/repository/org/jboss/arquillian/protocol/arquillian-protocol-servlet/1.1.0.Final/arquillian-protocol-servlet-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/arquillian/container/arquillian-container-spi/1.1.0.Final/arquillian-container-spi-1.1.0.Final.jar
/Users/sven/.m2/repository/org/jboss/shrinkwrap/descriptors/shrinkwrap-descriptors-api-base/2.0.0-alpha-3/shrinkwrap-descriptors-api-base-2.0.0-alpha-3.jar
/Users/sven/.m2/repository/org/jboss/shrinkwrap/descriptors/shrinkwrap-descriptors-spi/2.0.0-alpha-3/shrinkwrap-descriptors-spi-2.0.0-alpha-3.jar
/Volumes/SVEN/dev/eclipse/jee-oxygen2/Eclipse.app/Contents/Eclipse/configuration/org.eclipse.osgi/1714/0/.cp/
/Volumes/SVEN/dev/eclipse/jee-oxygen2/Eclipse.app/Contents/Eclipse/configuration/org.eclipse.osgi/1713/0/.cp/

Answer 1

问题不在于你的persistence.xml文件或它的位置，而是你的类路径上没有提供者JAR，所以它没有被插入。你应该通过maven为你想要的持久性提供者添加依赖性：例如Hibernate。

<dependency>
    <groupId>org.hibernate.javax.persistence</groupId>
    <artifactId>hibernate-jpa-2.1-api</artifactId>
    <version>1.0.0.Final</version>
</dependency>

您可以使用OpenJPA（如果添加Java EE提供的依赖项

，则可以使用参考实现）

<dependency>
    <groupId>javax</groupId>
    <artifactId>javaee-api</artifactId>
    <version>7.0</version>
    <scope>provided</scope>
</dependency>

在类路径上有提供程序实现JAR后，JPA会自动获取它。

JUnit Eclipse JPA persistence.xml未找到

1 个答案: