如何在运行spring boot应用时解析java.lang.NoClassDefFoundError: com/fasterxml/classmate/TypeResolver

Question

我正在尝试运行一个与keycloak集成的示例应用程序(用于IAM)。构建是成功的，但在运行应用程序时，我得到下面的错误...

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-19 11:30:28.660 ERROR 103440 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultValidator' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/classmate/TypeResolver
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1708) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:581) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:503) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

at org.keycloak.quickstarts.devconf2019.app.CarsApp.main(CarsApp.java:38) [classes/:na]
Caused by: java.lang.NoClassDefFoundError: com/fasterxml/classmate/TypeResolver

我已经添加了com.fasterxml.jackson.core(2.9.5)和com.fasterxml(1.3.1)作为依赖项。Springboot版本是- 2.0.3.RELEASE

是否存在与fasterxml依赖关系的版本兼容性问题？如何找到丢失的依赖并解决这个问题？

Answer 1

您需要添加hibernate验证器依赖项，它附带了捆绑在其中的com.fasterxml:classmate。

<dependency>
    <groupId>org.hibernate.validator</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>7.0.1.Final</version>
</dependency>