Question

我有一个带Swing GUI的spring-boot应用程序。它只是工作！但是，只要我将 spark 2.0 依赖项添加到 pom.xml 文件，它就会在启动时显示以下错误消息，并且无法启动！

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/ehsun7b/.m2/repository/ch/qos/logback/logback-classic/1.1.7/logback-classic-1.1.7.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/ehsun7b/.m2/repository/org/slf4j/slf4j-log4j12/1.7.21/slf4j-log4j12-1.7.21.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.4.1.RELEASE)

2016-10-21 00:02:23.795  INFO 1642 --- [           main] edu.mfldclin.mcrf.vakilabad.Application  : Starting Application on Ehsuns-MacBook-Pro.local with PID 1642 (/Users/ehsun7b/NetBeansProjects/vakilabad/target/classes started by ehsun7b in /Users/ehsun7b/NetBeansProjects/vakilabad)
2016-10-21 00:02:23.797  INFO 1642 --- [           main] edu.mfldclin.mcrf.vakilabad.Application  : No active profile set, falling back to default profiles: default
2016-10-21 00:02:23.839  INFO 1642 --- [           main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@67c27493: startup date [Fri Oct 21 00:02:23 MYT 2016]; root of context hierarchy
2016-10-21 00:02:24.290  INFO 1642 --- [           main] f.a.AutowiredAnnotationBeanPostProcessor : JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
2016-10-21 00:02:25.650  INFO 1642 --- [           main] e.m.mcrf.vakilabad.log.LogService        : LogService init.
2016-10-21 00:02:25.767  INFO 1642 --- [           main] e.mfldclin.mcrf.vakilabad.log.LogFrame   : Adding LogFrame instance to the LogMonitors of LogService: edu.mfldclin.mcrf.vakilabad.log.LogFrame[frame0,0,2,511x390,invalid,hidden,layout=java.awt.BorderLayout,title=Log since 2016-10-21T00:02:25.750,resizable,normal,defaultCloseOperation=DISPOSE_ON_CLOSE,rootPane=javax.swing.JRootPane[,0,22,511x368,invalid,layout=javax.swing.JRootPane$RootLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=16777673,maximumSize=,minimumSize=,preferredSize=],rootPaneCheckingEnabled=true]
2016-10-21 00:02:25.897  WARN 1642 --- [           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.info.ProjectInfoAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'spring.info-org.springframework.boot.autoconfigure.info.ProjectInfoProperties': 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.
2016-10-21 00:02:25.897  INFO 1642 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Unregistering JMX-exposed beans on shutdown
2016-10-21 00:02:25.902  INFO 1642 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2016-10-21 00:02:25.906 ERROR 1642 --- [           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

这是我添加的依赖项：

<dependency> 
  <groupId>org.apache.spark</groupId>
  <artifactId>spark-core_2.11</artifactId>
  <version>2.0.1</version>
</dependency>

Answer 1

I am seeing in spark-core_2.11-2.0.1.jar\META-INF\DEPENDENCIES and there is:

// ------------------------------------------------------------------
// Transitive dependencies of this project determined from the
// maven pom organized by organization.
// ------------------------------------------------------------------

Spark Project Core


From: 'an unknown organization'
...
...
  - Bean Validation API (http://beanvalidation.org) javax.validation:validation-api:jar:1.1.0.Final
    License: The Apache Software License, Version 2.0  (http://www.apache.org/licenses/LICENSE-2.0.txt)

and with @EnableAutoConfiguration spring probably see this dependency on classpath and try to find implementation of Java specification for Bean Validation. (Some interesting reading for spring validation).

In my opinion it is because spark uses jersey as a way how to show us information of job status and so on jersey bean-validation - but I am not quite sure about this statement.

But you can fix this issue by providing implementation of Bean Validation - just add dependency of implementation to maven.

Hibernate-validator

<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.3.0.Final</version>
</dependency>

or much more quicker (source) Apache BeanValidation.

<!-- https://mvnrepository.com/artifact/org.apache.bval/bval-jsr303 -->
<dependency>
    <groupId>org.apache.bval</groupId>
    <artifactId>bval-jsr303</artifactId>
    <version>0.5</version>
</dependency>

SOLUTION is in the comments! (exclusion of validation API)

Spark maven依赖性打破了sprint-boot应用程序

1 个答案: