使用springboot向类路径错误添加实现，例如Hibernate Validator
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【中文标题】使用springboot向类路径错误添加实现，例如Hibernate Validator【英文标题】：Add an implementation, such as Hibernate Validator, to the classpath error using springboot 【发布时间】：2018-06-18 09:07:49 【问题描述】：我是 Spring Boot 新手并构建了我的第一个简单项目，但在运行应用程序时遇到了问题。
您能告诉我为什么它在下面给出错误吗？
pom.xml
<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>io.javabrains.springbootquickstart</groupId>
<artifactId>course-api</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>java Brains Course API</name>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
</dependency>
</dependencies>
<properties>
<java.version>1.8</java.version>
</properties>
</project>
CourseApiApp.java
package io.javabrains.springbootstarter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class CourseApiApp
public static void main(String[] args)
SpringApplication.run(CourseApiApp.class, args);
这个截图属于我的例子。
以下控制台输出：应用程序无法启动。 "在类路径中添加一个实现，例如 Hibernate Validator"
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.1.RELEASE)
2018-01-09 11:31:47.216 INFO 12224 --- [ main] i.j.springbootstarter.CourseApiApp : Starting CourseApiApp on kafein-kafein with PID 12224 (C:\Users\kafein\Documents\workspace-sts-3.9.2.RELEASE\course-api\target\classes started by kafein in C:\Users\kafein\Documents\workspace-sts-3.9.2.RELEASE\course-api)
2018-01-09 11:31:47.223 INFO 12224 --- [ main] i.j.springbootstarter.CourseApiApp : No active profile set, falling back to default profiles: default
2018-01-09 11:31:47.314 INFO 12224 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@2a8448fa: startup date [Tue Jan 09 11:31:47 EET 2018]; root of context hierarchy
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.springframework.cglib.core.ReflectUtils$1 (file:/C:/Users/kafein/.m2/repository/org/springframework/spring-core/4.3.6.RELEASE/spring-core-4.3.6.RELEASE.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain)
WARNING: Please consider reporting this to the maintainers of org.springframework.cglib.core.ReflectUtils$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
2018-01-09 11:31:48.148 WARN 12224 --- [ main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'standardJacksonObjectMapperBuilderCustomizer' defined in class path resource [org/springframework/boot/autoconfigure/jackson/JacksonAutoConfiguration$Jackson2ObjectMapperBuilderCustomizerConfiguration.class]: Unsatisfied dependency expressed through method 'standardJacksonObjectMapperBuilderCustomizer' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.jackson-org.springframework.boot.autoconfigure.jackson.JacksonProperties': Initialization of bean failed; nested exception is javax.validation.ValidationException: Unable to create a Configuration, because no Bean Validation provider could be found. Add a provider like Hibernate Validator (RI) to your classpath.
2018-01-09 11:31:48.156 INFO 12224 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-01-09 11:31:48.162 ERROR 12224 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
The Bean Validation API is on the classpath but no implementation could be found
Action:
Add an implementation, such as Hibernate Validator, to the classpath
【问题讨论】：
【参考方案1】：您缺少一些库。将以下 Spring Boot 依赖项添加到您的 pom.xml 以解决它。 Spring Boot 会找出在您的项目中使用的正确实现。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
另外，添加 Hibernate 依赖项：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- Hibernate -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-ehcache</artifactId>
<exclusions>
<exclusion>
<groupId>net.sf.ehcache</groupId>
<artifactId>ehcache</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-java8</artifactId>
</dependency>
【讨论】：
我加了这个但还是一样。 谢谢，但没有任何改变：s 尝试从你的 pom.xml 中移除hibernate-validator 依赖。我没有使用它。 Spring Boot 会自动添加。
添加 spring-boot-starter-validation 依赖为我解决了这个问题！
Ehcache 依赖与此无关【参考方案2】：
应该在最新的 Spring Boot 版本中通过此链接进行修复：https://github.com/spring-projects/spring-boot/pull/12669（允许类路径中的验证 api 没有实现）。对于较旧的引导版本，修复此异常的另一个选项是排除 vaidation API。下面是使用 spring-boot-starter web 时的示例：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
</exclusion>
</exclusions>
</dependency>
【讨论】：
【参考方案3】：我只需要添加：
compile 'org.springframework.boot:spring-boot-starter-validation'
【讨论】：
【参考方案4】：我正在使用 Spring Boot 版本 2.4.4。最初，我使用了以下不起作用的 spring 验证器依赖项。
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
但后来，我使用了下面的休眠依赖，它在我的代码中完美运行
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.0.2.Final</version>
</dependency>
【讨论】：
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