问题
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, $Java_Home: /usr/lib/jvm/java-8-oracle
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:: Spring Boot :: (v1.4.2.RELEASE)
2018-01-28 09:37:14.658 INFO 7971 --- [ main] i.j.springbootstarter.CourseApiApp : Starting CourseApiApp on rudresh-Vostro-14-3468 with PID 7971 (/home/rudresh/Documents/workspace-sts-3.9.2.RELEASE/course-api/target/classes started by rudresh in /home/rudresh/Documents/workspace-sts-3.9.2.RELEASE/course-api)
2018-01-28 09:37:14.667 INFO 7971 --- [ main] i.j.springbootstarter.CourseApiApp : No active profile set, falling back to default profiles: default
2018-01-28 09:37:14.827 INFO 7971 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@6dde5c8c: startup date [Sun Jan 28 09:37:14 IST 2018]; root of context hierarchy
2018-01-28 09:37:16.551 WARN 7971 --- [ main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration$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);
}
}
回答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>
回答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
回答3:
I faced the same issue. My project has almost a year on production and this week I needed to make some changes, and for surprise, the project could not even be built. I solved the issue by adding the following dependency to my project.
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${your-desired-version-matching-project-own}</version>
</dependency>
Note: I was using spring starters dependency, but still not loading that dependency.
来源：https://stackoverflow.com/questions/48483120/the-bean-validation-api-is-on-the-classpath-but-no-implementation-could-be-foun