Java IllegalArgumentException：必须至少存在一个 JPA 元模型
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IllegalArgumentException: At least one JPA metamodel must be present
提问by user_xyz.LOL
while starting with spring rest I got following error as
从弹簧休息开始时，我遇到了以下错误
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method failed; nested exception is java.lang.IllegalArgumentException: At least one JPA metamodel must be present! at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1595) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:566) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:725) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:736) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:369) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at org.springframework.boot.SpringApplication.run(SpringApplication.java:313) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1161) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1150) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at com.java.app.QuickPollApplication.main(QuickPollApplication.java:14) [classes/:na] Caused by: java.lang.IllegalArgumentException: At least one JPA metamodel must be present! at org.springframework.util.Assert.notEmpty(Assert.java:438) ~[spring-core-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.data.jpa.mapping.JpaMetamodelMappingContext.(JpaMetamodelMappingContext.java:52) ~[spring-data-jpa-1.11.0.BUILD-SNAPSHOT.jar:na] at org.springframework.data.jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:71) ~[spring-data-jpa-1.11.0.BUILD-SNAPSHOT.jar:na] at org.springframework.data.jpa.repository.config.JpaMetamodelMappingContextFactoryBean.createInstance(JpaMetamodelMappingContextFactoryBean.java:26) ~[spring-data-jpa-1.11.0.BUILD-SNAPSHOT.jar:na] at org.springframework.beans.factory.config.AbstractFactoryBean.afterPropertiesSet(AbstractFactoryBean.java:134) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1654) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1591) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] ... 16 common frames omitted
org.springframework.beans.factory.BeanCreationException：创建名为“jpaMappingContext”的 bean 时出错：调用 init 方法失败；嵌套异常是 java.lang.IllegalArgumentException：必须存在至少一个 JPA 元模型！在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1595) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] 在 org.springframework。 beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:566) ~[spring-beans-5.0.0.BUILD-SNAPSHOT.jar:5.0.0.BUILD-SNAPSHOT] 在 org.springframework.beans.factory.support .AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-5.0.0. BUILD-SNAPSHOT] 在 org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:369) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 在 org.springframework.boot .SpringApplication.run(SpringApplication.java:313) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:1161) ) [spring-boot-2.0.0.BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] 在 org.springframework.boot.SpringApplication.run(SpringApplication.java:1150) [spring-boot-2.0.0. BUILD-SNAPSHOT.jar:2.0.0.BUILD-SNAPSHOT] at com.java.app.QuickPollApplication.main(QuickPollApplication.java:14) [classes/:na] 引起：java.lang.IllegalArgumentException：至少一个 JPA元模型必须存在！在 org.springframework.util.Assert。
with following code
使用以下代码
@SpringBootApplication
@RestController
public class QuickPollApplication {
public static void main(String[] args) {
SpringApplication.run(QuickPollApplication.class, args);
}
@RequestMapping(value = "/test", method = RequestMethod.GET)
public String testRest() {
return "rest tested";
}
and following is my pom.xml
以下是我的 pom.xml
UTF-8 UTF-8 1.8
UTF-8 UTF-8 1.8
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web-services</artifactId>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</pluginRepository>
</pluginRepositories>
Please help me. I do not know how to solve this error
请帮我。我不知道如何解决这个错误
采纳答案by Andrei Sfat
You have added
您已添加
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
in your pom.xml.
在你的 pom.xml 中。
Spring boot will try automatically create an entity factory for JPA, but you do not have defined anything regarding JPA models.
Spring boot 将尝试自动为 JPA 创建实体工厂，但您尚未定义任何有关 JPA 模型的内容。
Try removing it in order to test what have you done so far.
尝试删除它以测试您到目前为止所做的工作。
Afterwards you can check a tutorial using spring-data-starter-jpa like this guy
之后你可以像这个人一样使用 spring-data-starter-jpa 查看教程
回答by AlexGera
I've fixed it by setting newer version of Hibernate.
我已经通过设置较新版本的 Hibernate 来修复它。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<exclusions>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</exclusion>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.10.Final</version>
</dependency>
You can find a fully working example here: https://github.com/zobarov/ptc-task-executor
您可以在这里找到一个完整的示例：https: //github.com/zobarov/ptc-task-executor
回答by Nandan
This worked for me.
这对我有用。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<exclusions>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</exclusion>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.10.Final</version>
</dependency>
回答by nickb
You can also disable Spring Data JPA's repository support by excluding the following auto configuration class (e.g. in your @EnableAutoConfigurationor @SpringBootApplicationannotation)
您还可以通过排除以下自动配置类（例如在您的@EnableAutoConfigurationor@SpringBootApplication注释中）来禁用 Spring Data JPA 的存储库支持
org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration
For example:
例如：
@EnableAutoConfiguration(exclude = JpaRepositoriesAutoConfiguration.class)
