时间戳

首页 > 解决方案 > 从 Java 10.0 NullPointer 开始搜索持久性 - JPA eclipselink 2.6.5

jpa - 从 Java 10.0 NullPointer 开始搜索持久性 - JPA eclipselink 2.6.5

问题描述

我将一些带有 eclipselink 2.6.5 的 EJB 实体用于 Rest 服务（TomEE 服务器中的 Jersy）。

使用 jdk-1.8 可以正常工作，但是使用新的 jdk-10.0 现在我在搜索持久性时遇到了 NullPointerException。

我的 JPA 环境中是否存在错误或不匹配？

谢谢

史蒂芬

Exception in thread "main" Local Exception Stack: 
Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.6.5.v20170607-b3d05bd): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
    Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: jdk.internal.loader.ClassLoaders$AppClassLoader@41906a77
    Internal Exception: java.lang.NullPointerException
        at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:127)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:115)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:188)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:79)
        at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
        at de.company.test.simulation.session.MySimulationService.<init>(MySimulationService.java:50)
        at de.company.test.simulation.controller.MyController.<init>(MyController.java:81)
        at de.company.test.simulation.MySimulationLauncher.main(MySimulationLauncher.java:156)
    Caused by: java.lang.NullPointerException
        at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:2030)
        at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:100)
        at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactoryImpl(PersistenceProvider.java:104)

我的 persitence.xml

http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd" version="2.1">

<persistence-unit name="myUnitName" transaction-type="RESOURCE_LOCAL">
    <provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
    <class>de.company.test.simulation.entities.ProjectEntity</class>

    <exclude-unlisted-classes>false</exclude-unlisted-classes>
    <properties>
        <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
        <property name="javax.persistence.jdbc.url" value="jdbc:mysql://mysql.mediatransfer.de/dbName?useUnicode=true&useJDBCCompliantTimezoneS‌​hift=true&useLegacyDatetimeCode=false&serverTimezone=UTC" />
        <property name="javax.persistence.jdbc.user" value="userName" />
        <property name="javax.persistence.jdbc.password" value="****" />

        <!-- EclipseLink should create the database schema automatically -->
        <property name="eclipselink.ddl-generation" value="none" />
        <property name="eclipselink.ddl-generation.output-mode" value="database" />
        <property name="eclipselink.logging.level" value="SEVERE" />
    </properties>
</persistence-unit>

这是我的 Web 应用程序 ProjectEntity 中的一个实体示例。这在 java 1.8 中对我来说很好。

    @Entity(name = "ProjectEntity")
    @Table(name = "项目")
    公共类 ProjectEntity 实现可序列化 {
        @ID
        @GeneratedValue（策略 = GenerationType.IDENTITY）
        @Column（名称=“id”，可空=假，唯一=真，可更新=假）
        私人整数 id；
        @Column(name = "project_name", nullable = false, length = 256)
        @NotNull
        私有字符串项目名称；
        公共项目实体（）{}
        //

..

标签： jpaeclipselinkpersistencejava-10

解决方案

在我遇到同样的问题后，升级到 EclipseLink 2.7.3 为我解决了这个问题。

推荐阅读