原因：javax.persistence.PersistenceException:无法解析持久性单位根URL

原因：

java.io.FileNotFoundException:类路径资源[]无法解析为URL，因为它不存在

使用的技术：

Gradle，Springboot，jdk7

异常跟踪：

tionConfigEmbeddedWebApplicationContext:在上下文初始化期间遇到异常-取消刷新att empt:org.springframework.beans.factory.BeanCreationException:创建名为“entityManagerFactory”的bean时出错，该bean在类路径资源[org/springframework/boot/aut]中定义 oconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]：调用init方法失败；嵌套异常为javax.persistence.PersistenceException:无法解析persistence 单位根URL 2018-05-14 21:11:04.427信息3136---[main]o.apache.catalina.core.StandardService:停止服务Tomcat 2018-05-14 21:11:04.505信息3136---[main]自动配置报告日志初始化器：

启动ApplicationContext时出错。要显示自动配置报告，请启用调试日志记录（从--debug开始）

2018-05-14 21:11:04.552错误3136---[main]o.s.boot.SpringApplication:应用程序启动失败

org.springframework.beans.factory.BeanCreationException:创建名为“entityManagerFactory”的bean时出错，该bean在类路径资源[org/springframework/boot/autoconfi]中定义 gure/orm/jpa/HibernateJpaAutoConfiguration.class]：初始化方法调用失败；嵌套异常为javax.persistence.PersistenceException:无法解析持久性u nit根URL 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean（AbstractAutowireCapableBeanFactory.java:1578）~[spring-beans-4.3.2.RELEAS E.jar！/：4.3.2.发布] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean（AbstractAutowireCapableBeanFactory.java:545）~[spring-beans-4.3.2.RELEASE.j ar！/：4.3.2.发布] 在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean（AbstractAutowireCapableBeanFactory.java:482）~[spring-beans-4.3.2.RELEASE.jar ！/：4.3.2.发布] 在org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject（AbstractBeanFactory.java:306）~[spring-beans-4.3.2.RELEASE.jar！/：4.3.2.RELEASE] 在org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton（DefaultSingletonBeanRegistry.java:230）~[spring-beans-4.3.2.RELEASE.jar！/：4.3.2.R [电子版] 在org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean（AbstractBeanFactory.java:302）~[spring-beans-4.3.2.RELEASE.jar！/：4.3.2.RELEASE] 在org.springframework.beans.factory.support.AbstractBeanFactory.getBean（AbstractBeanFactory.java:197）~[spring-beans-4.3.2.RELEASE.jar！/：4.3.2.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.getBean（AbstractApplicationContext.java:1076）~[spring-context-4.3.2.RELEASE.jar！/：4.3.2.RELEASE] 在org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization（AbstractApplicationContext.java:851）~[spring-context-4.3.2.RELEASE.ja r！/：4.3.2.发布] 在org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:541）~[spring-context-4.3.2.RELEASE.jar！/：4.3.2.RELEASE] 在org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh（EmbeddedWebApplicationContext.java:122）~[spring-boot-1.4.0.RELEASE.jar！/：1.4.0.RELEA [东南] 在org.springframework.boot.SpringApplication.refresh（SpringApplication.java:759）[spring-boot-1.4.0.RELEASE.jar！/：1.4.0.RELEASE] 在org.springframework.boot.SpringApplication.refreshContext（SpringApplication.java:369）[spring-boot-1.4.0.RELEASE.jar！/：1.4.0.RELEASE] 在org.springframework.boot.SpringApplication.run（SpringApplication.java:313）[spring-boot-1.4.0.RELEASE.jar！/：1.4.0.RELEASE] 在org.springframework.boot.SpringApplication.run（SpringApplication.java:1185）[spring-boot-1.4.0.RELEASE.jar！/：1.4.0.RELEASE] 在org.springframework.boot.SpringApplication.run（SpringApplication.java:1174）[spring-boot-1.4.0.RELEASE.jar！/：1.4.0.RELEASE] 在com.Application.main（Application.java:15）[classes！/：na] 在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）~[na:1.8.0_171] 在sun.reflect.NativeMethodAccessorImpl.invoke（未知源）~[na:1.8.0_171] 在sun.reflect.DelegatingMethodAccessorImpl.invoke（未知源）~[na:1.8.0_171] 在java.lang.reflect.Method.invoke（未知源代码）~[na:1.8.0_171] 位于org.springframework.boot.loader.MainMethodRunner.run（MainMethodRunner.java:48）[Batch-0.1.0.war:na] 在org.springframework.boot.loader.Launcher.launch（Launcher.java:87）[Batch-0.1.0.war:na] 在org.springframework.boot.loader.Launcher.launch（Launcher.java:50）[Batch-0.1.0.war:na] 位于org.springframework.boot.loader.WarLauncher.main（WarLauncher.java:59）[Batch-0.1.0.war:na] 原因：javax.persistence.PersistenceException:无法解析持久性单位根URL 在org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.DeterminatedDefaultPersistenceUnitRootURL（DefaultPersistenceUnitManager.java:603）~[spring orm -4.3.2.RELEASE.jar！/：4.3.2.RELEASE] 在org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.preparePersistenceUnitInfo（DefaultPersistenceUnitManager.java:443）~[spring-orm-4.3.2.RELE ASE.jar！/：4.3.2.发布] 在org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager.afterPropertiesSet（DefaultPersistenceUnitManager.java:424）~[spring-orm-4.3.2.RELEASE.jar/ ：4.3.2.发布] 位于org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory（LocalContainerEntityMa

buildscript {
repositories {
    mavenCentral()
}
dependencies {
    classpath("org.springframework.boot:spring-boot-gradle-plugin:1.4.0.RELEASE")
}
}
group 'batch'
version '1.0-SNAPSHOT'

apply plugin: 'java'
apply plugin: 'spring-boot'
apply plugin: 'war'

bootRun {
addResources = true
}

war {
baseName = 'Batch'
version =  '0.1.0'
manifest {
    attributes 'Main-Class': 'com.Application'
}
}
jar {
manifest {
    attributes 'Main-Class': 'src.main.java.com.Application'
}
}
sourceCompatibility = 1.7
targetCompatibility = 1.7

repositories {
mavenCentral()
}
dependencies {
compile group: 'org.springframework.boot', name: 'spring-boot-starter-web', version: '1.5.6.RELEASE'
compile group: 'mysql', name: 'mysql-connector-java', version: '5.1.24'
compile group: 'org.json', name: 'json', version: '20180130'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-data-jpa', version: '1.5.6.RELEASE'
compile group: 'javax.servlet', name: 'jstl', version: '1.2'
compile group: 'org.apache.tomcat.embed', name: 'tomcat-embed-jasper', version: '7.0.82'
compile group: 'org.springframework.boot', name: 'spring-boot-starter-tomcat', version: '1.2.4.RELEASE'
compile group: 'org.springframework.data', name: 'spring-data-jpa', version: '1.7.4.RELEASE'
compile group: 'org.eclipse.persistence', name: 'javax.persistence', version: '2.1.1'
}

compile group: 'org.eclipse.persistence', name: 'javax.persistence', version: '2.1.1'

@Entity
public class TestEntity {
    @Id
    @GeneratedValue
    private int id;
}