Spring boot Spring Boot 1.4.1 runnable jar javax.persistence.PersistenceException:无法解析持久化单元根URL

我们有一个Spring Boot 1.4.1应用程序，当我们创建runnable jar并尝试运行它时，我们得到以下堆栈跟踪：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'xxxEntityManager' defined in class path resource [xxx/web/config/XxxConfig.class]: Invocation of init method failed; nested exception is javax.persistence.Persistenc
eException: Unable to resolve persistence unit root URL
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1583) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1076) ~[spring-context-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:851) ~[spring-context-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.4.1.RELEASE.jar!/:1.4.1.RELEASE]
        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.1.RELEASE.jar!/:1.4.1.RELEASE]
        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.1.RELEASE.jar!/:1.4.1.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.1.RELEASE.jar!/:1.4.1.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.1.RELEASE.jar!/:1.4.1.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.1.RELEASE.jar!/:1.4.1.RELEASE]
        at xxx.App.main(App.java:48) [classes!/:0.0.1-SNAPSHOT]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_05]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_05]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_05]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_05]
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [NES-Web-0.0.1-SNAPSHOT-exec.jar:0.0.1-SNAPSHOT]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [NES-Web-0.0.1-SNAPSHOT-exec.jar:0.0.1-SNAPSHOT]
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) [NES-Web-0.0.1-SNAPSHOT-exec.jar:0.0.1-SNAPSHOT]
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:58) [NES-Web-0.0.1-SNAPSHOT-exec.jar:0.0.1-SNAPSHOT]
Caused by: javax.persistence.PersistenceException: Unable to resolve persistence unit root URL
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.determineDefaultPersistenceUnitRootUrl(DefaultPersistenceUnitManager.java:605) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.preparePersistenceUnitInfos(DefaultPersistenceUnitManager.java:445) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.afterPropertiesSet(DefaultPersistenceUnitManager.java:426) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:325) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:373) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:362) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1642) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1579) ~[spring-beans-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        ... 24 common frames omitted
Caused by: java.io.FileNotFoundException: class path resource [] cannot be resolved to URL because it does not exist
        at org.springframework.core.io.ClassPathResource.getURL(ClassPathResource.java:187) ~[spring-core-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        at org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.determineDefaultPersistenceUnitRootUrl(DefaultPersistenceUnitManager.java:602) ~[spring-orm-4.3.3.RELEASE.jar!/:4.3.3.RELEASE]
        ... 31 common frames omitted

我们也发现了这个问题，但根据它，这应该在SpringBoot1.4.1中修复

---

注意：我们的模型类中没有注释，我们使用hbm.xml文件进行映射。但是，我们使用Spring数据JPA存储库。

您可能会受到影响。该问题中提供了一个解决方法。请尝试一下，等待

1.4.2.发布
。抱歉：（
根据我在此处阅读的说明（），我通过执行以下操作设法解决了此问题：

我创建了META-INF/orm.xml文件，并将其放在src/main/resources文件夹中。文件的内容可以在这个链接中找到（实际上您不需要持久性单元元数据、命名查询和实体标记，只需要一个带有根实体映射标记的空xml就足够了）

配置LocalContainerEntityManagerFactoryBean bean时，我需要调用setPersistenceUnitRootLocation方法并将位置设置为类路径：META-INF/orm.xml

这个变通方法解决了我在运行fat jar时遇到的问题。然而，通过实现这个变通方法，我又产生了另一个问题——我无法从IDE运行应用程序，因此我必须基于某种指标来实现持久化单元根位置的某种条件设置，不管我是在运行jar还是在IDE。
我也遇到了同样的错误使用maven jar插件构建jar，但像下面这样构建jar可以正常工作：

    <build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
     </plugins>
    </build>


org.springframework.boot
springbootmaven插件
Stephane，我在一篇评论中上传了示例项目，我在这里学会了如何检测胖罐子模式：