"The Bean Validation API is on the classpath but no implementation could be found" preventing startup

Question

I am using Spring Tool Suite to work with ReST services in Java. But at the very first point I am not able to start my first simple application. Please help. I am getting below error. [Using Java8, STS suite, Ubuntu 16.04, $Java_Home: /usr/lib/jvm/java-8-oracle

  .   ____          _            __ _ _  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )   '  |____| .__|_| |_|_| |_\__, | / / / /  =========|_|==============|___/=/_/_/_/  :: Spring Boot ::        (v1.4.2.RELEASE)  2018-01-28 09:37:14.658  INFO 7971 --- [           main] i.j.springbootstarter.CourseApiApp       : Starting CourseApiApp on rudresh-Vostro-14-3468 with PID 7971 (/home/rudresh/Documents/workspace-sts-3.9.2.RELEASE/course-api/target/classes started by rudresh in /home/rudresh/Documents/workspace-sts-3.9.2.RELEASE/course-api) 2018-01-28 09:37:14.667  INFO 7971 --- [           main] i.j.springbootstarter.CourseApiApp       : No active profile set, falling back to default profiles: default 2018-01-28 09:37:14.827  INFO 7971 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@6dde5c8c: startup date [Sun Jan 28 09:37:14 IST 2018]; root of context hierarchy 2018-01-28 09:37:16.551  WARN 7971 --- [           main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration$StringHttpMessageConverterConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.http.encoding-org.springframework.boot.autoconfigure.web.HttpEncodingProperties': 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. 2018-01-28 09:37:16.552  INFO 7971 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown 2018-01-28 09:37:16.568  INFO 7971 --- [           main] utoConfigurationReportLoggingInitializer :   Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 2018-01-28 09:37:16.578 ERROR 7971 --- [           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 

Below is my POM.xml file. The whole example is taken from JavaBrains tutorial on YouTube for reference purpose. I suspect some issue either with Environment or the Hibernate validation which i have not installed in my system.

<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>1.4.2.RELEASE</version>   </parent>   <properties>         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>         <java.version>1.8</java.version>     </properties>       <dependencies>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>         </dependency>          <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>             <scope>test</scope>         </dependency>     </dependencies>      <build>         <plugins>             <plugin>                 <groupId>org.springframework.boot</groupId>                 <artifactId>spring-boot-maven-plugin</artifactId>             </plugin>         </plugins>     </build>   </project>  "This is main class to start SpringBoot application. Although it does not do anything but it should at least redirect to browser Error page."   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) {         // TODO Auto-generated method stub         SpringApplication.run(CourseApiApp.class, args);     }  } 

Answer 1

In my case, I added the following dependency and its worked, Even I do not need any validation, maybe the Java update caused this issue.

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

Answer 2

Delete all files from <user_home>/.m2/repository and try "maven --> install project.

It seems that a file got corrupted. So in order to download the files correctly, try this procedure.

It should not be required to add any other dependencies at all. 'web' injects the validators that are missing.

Had the same issue here and it got solved by doing this procedure. You only need to do this once and then you will be good to go again. (sometimes - don't ask why - the local m2 repo gets corrupted).

Hope it helps. Regards, Ivan