使用JakartaJPA3.0时出现异常
使用JakartaJPA3.0时出现异常
提问于 2022-02-16 11:41:05
在一个基于JakartaJPA3.0的项目中，我得到了一个例外。下面是我的依赖项，persistence.xml和例外文件。
依赖性
<groupId>jakarta.persistence</groupId>
<artifactId>jakarta.persistence-api</artifactId>
<version>3.0.0</version>
</dependency> Persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
version="3.0">
<persistence-unit name="usecase" transaction-type="RESOURCE_LOCAL">
<exclude-unlisted-classes>false</exclude-unlisted-classes>
<properties>
<property name="jakarta.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver" />
<property name="jakarta.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/usecase" />
<property name="jakarta.persistence.jdbc.user" value="root" />
<property name="jakarta.persistence.jdbc.password" value="********" />
</properties>
</persistence-unit>
</persistence>异常
Feb 16, 2022 1:39:01 PM jakarta.persistence.spi.PersistenceProviderResolverHolder$DefaultPersistenceProviderResolver log
WARNING: jakarta.persistence.spi::No valid providers found.
Exception in thread "main" java.lang.ExceptionInInitializerError
at za.co.lot24media.usecase.Main.main(Main.java:10)
Caused by: jakarta.persistence.PersistenceException: No Persistence provider for EntityManager named usecase
at jakarta.persistence.Persistence.createEntityManagerFactory(Persistence.java:86)
at jakarta.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at za.co.lot24media.usecase.Database.<init>(Database.java:15)
at za.co.lot24media.usecase.Database.<clinit>(Database.java:9)
... 1 more回答 1
Stack Overflow用户
回答已采纳
发布于 2022-02-20 16:53:04
您只依赖于Java持久性API。但是，要在应用程序中使用JPA3.0，您需要向实现添加一个依赖项，例如EclipseLink。
为了使用EclipseLink作为JPA提供程序，您必须将相关的实现作为依赖项添加到项目中，例如通过Maven：
<!-- https://mvnrepository.com/artifact/org.eclipse.persistence/eclipselink -->
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>3.0.2</version>
</dependency>注意，您需要一个版本> 3.0.0才能使用JakartaPersistenceAPI3.0。
然后，可以通过persistence.xml <provider>-tag在-tag中指定提供程序(有关更多信息，请参见文档 of EclipseLink )：
<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence
https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
version="3.0">
<persistence-unit name="ejblite-pu" transaction-type="JTA">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
</persistence-unit>
</persistence>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/71141194
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