Question

我是Java新手，我正在尝试一个示例Spring Boot应用程序。我正在使用eclipse IDE和Java 8.使用maven-archetype-quickstart原型创建了一个Maven项目。在pom.xml中

<project xmlns="http://maven.apache.org/POM/4.0.0" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

<groupId>com.demo</groupId>
<artifactId>StormpathSpringBoot</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>StormpathSpringBoot</name>
<url>http://maven.apache.org</url>
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.3.RELEASE</version>
</parent>

 <properties>
 <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 </properties>

<dependencies>
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <scope>test</scope>
</dependency>
 <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-rest</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

</dependencies>

 </project>

在App.java中

package com.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App 
{
    public static void main( String[] args )
{
    SpringApplication.run(App.class, args);
}
}

然后我运行应用程序RunAs - ＆gt; Maven Build 目标 - ＆GT;弹簧引导：运行

不知道这是运行此应用程序的正确方法

我收到错误

 2017-08-03 02:33:19.294  INFO 5124 --- [           main] com.demo.App                             : Starting App on C4968397007 with PID 5124 (C:\Users\dev3\WS_SpringBoot\StormpathSpringBoot\target\classes started by dev3 in C:\Users\dev3\WS_SpringBoot\StormpathSpringBoot)
 2017-08-03 02:33:19.297  INFO 5124 --- [           main] com.demo.App                             : No active profile set, falling back to default profiles: default
 2017-08-03 02:33:19.518  INFO 5124 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@39dcb4f0: startup date [Thu Aug 03 02:33:19 EDT 2017]; root of context hierarchy
2017-08-03 02:33:21.121  INFO 5124 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'httpRequestHandlerAdapter' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$EnableWebMvcConfiguration; factoryMethodName=httpRequestHandlerAdapter; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.data.rest.webmvc.config.RepositoryRestMvcConfiguration; factoryMethodName=httpRequestHandlerAdapter; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]]
2017-08-03 02:33:21.950  INFO 5124 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$fcd1a082] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2017-08-03 02:33:22.354  INFO 5124 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-08-03 02:33:22.369  INFO 5124 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
 2017-08-03 02:33:22.370  INFO 5124 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.14
2017-08-03 02:33:22.471  INFO 5124 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2017-08-03 02:33:22.472  INFO 5124 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2954 ms
 2017-08-03 02:33:22.790  INFO 5124 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
2017-08-03 02:33:22.794  INFO 5124 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-08-03 02:33:22.794  INFO 5124 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
 2017-08-03 02:33:22.794  INFO 5124 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-08-03 02:33:22.795  INFO 5124 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
 2017-08-03 02:33:23.157  WARN 5124 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: 
  org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'profileController' defined in URL [jar:file:/C:/Users/dev3/.m2/repository/org/springframework/data/spring-data-rest-webmvc/2.6.3.RELEASE/spring-data-rest-webmvc-2.6.3.RELEASE.jar!/org/springframework/data/rest/webmvc/ProfileController.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceMappings' defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.rest.core.mapping.RepositoryResourceMappings]: Factory method 'resourceMappings' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentEntities' defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mapping.context.PersistentEntities]: Factory method 'persistentEntities' threw exception; nested exception is 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!

 Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'resourceMappings' defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.rest.core.mapping.RepositoryResourceMappings]: Factory method 'resourceMappings' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentEntities' defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mapping.context.PersistentEntities]: Factory method 'persistentEntities' threw exception; nested exception is 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!

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.rest.core.mapping.RepositoryResourceMappings]: Factory method 'resourceMappings' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentEntities' defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mapping.context.PersistentEntities]: Factory method 'persistentEntities' threw exception; nested exception is 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!

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'persistentEntities' defined in class path resource [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mapping.context.PersistentEntities]: Factory method 'persistentEntities' threw exception; nested exception is 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!

 Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.mapping.context.PersistentEntities]: Factory method 'persistentEntities' threw exception; nested exception is 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!

Caused by: 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!

Caused by: java.lang.IllegalArgumentException: At least one JPA metamodel must be present!

Answer 1

要运行，您可以：在eclipse中右键单击项目 - ＆gt;以 - ＆gt;运行Java应用程序

我使用基于Eclipse的IDE STS - 它通常更适合Spring，因为这里的初始配置是最新的并且经过了更好的测试

错误指出，没有定义JPA映射。您必须定义它们或从POM中删除depedndencies

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-rest</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

Answer 2

You are including spring-boot-starter-data-rest as a dependency. So there is a default controller with it (ProfileController), which is scanned at Spring context startup.

This controller has dependencies to other beans, one of which (jpaMappingContext) require a JPA configuration I guess.

Just remove this dependency and it should be fine.

Answer 3

正如评论/答案中已经提到的那样 - 您已经为Spring JPA添加了依赖项，但没有在项目中添加任何实体。你可以删除它并尝试。

<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency>

启动spring-boot项目的最佳位置可能是使用spring initializr。 https://start.spring.io/

使用pom.xml和app.java的简单spring-boot应用程序显示构建失败错误

3 个答案: