org.springframework.data.repository.query.QueryMethodEvaluationContextProvider :ClassNotFoundException

Question

在使用PostgreSQL作为数据库的现有Spring Boot应用程序中，在Getting Started with R2DBC video之后，我将一些存储库转换为reactive。应用程序在转换之前工作。在我尝试启动应用程序后，我得到以下错误：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'albumReactResource' defined in file [/app/classes/com/mycompany/myapp/web/rest/react/AlbumReactResource.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'albumReactRepository' defined in class path resource [com/mycompany/myapp/config/ReactDatabaseConfig.class]: Unsatisfied dependency expressed through method 'albumReactRepository' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'r2dbcRepositoryFactory' defined in class path resource [com/mycompany/myapp/config/ReactDatabaseConfig.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect Class [org.springframework.data.r2dbc.repository.support.R2dbcRepositoryFactory] from ClassLoader [sun.misc.Launcher$AppClassLoader@4e0e2f2a]
...
gallery-app_1         | Caused by: java.lang.ClassNotFoundException: org.springframework.data.repository.query.QueryMethodEvaluationContextProvider
gallery-app_1         |  at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
gallery-app_1         |  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
gallery-app_1         |  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
gallery-app_1         |  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
gallery-app_1         |  ... 51 common frames omitted

QueryMethodEvaluationContextProvider类应该在那里。我猜数据库配置不能与现有的数据库和Spring数据配置共存。

Spring Boot版本为2.0.5.RELEASE，相关依赖如下：

compile "org.springframework.boot:spring-boot-starter-webflux"
compile "org.springframework.data:spring-data-jdbc:1.0.0.r2dbc-SNAPSHOT"
compile "io.r2dbc:r2dbc-postgresql:1.0.0.M5"

下面是与视频代码相同的数据库配置：

配置公共类ReactDatabaseConfig {

@Bean
PostgresqlConnectionFactory connectionFactory(){
    return new PostgresqlConnectionFactory(

            PostgresqlConnectionConfiguration.builder()
                .host("localhost")
                .database("gallery")
                .username("postgres")
                .password("")
                .build()
        );
    }

    @Bean
    DatabaseClient databaseClient(ConnectionFactory connectionFactory){

        return DatabaseClient.builder()
                .connectionFactory(connectionFactory)
                .build();
    }

    @Bean
    R2dbcRepositoryFactory r2dbcRepositoryFactory(DatabaseClient client){

        RelationalMappingContext context = new RelationalMappingContext();
        context.afterPropertiesSet();

        return new R2dbcRepositoryFactory(client, context);
    }

    @Bean
    AlbumReactRepository albumReactRepository(R2dbcRepositoryFactory factory){
        return factory.getRepository(AlbumReactRepository.class); <-- exceptions occurs
    }
 ...
}

一些相关的依赖信息如下：

+--- org.springframework.data:spring-data-jdbc:1.0.0.r2dbc-SNAPSHOT
|    +--- org.springframework.data:spring-data-commons:2.1.1.BUILD-SNAPSHOT -> 2.0.10.RELEASE (*)
...
+--- org.springframework.security:spring-security-data -> 5.0.8.RELEASE
|    +--- javax.xml.bind:jaxb-api:2.3.0
|    +--- org.springframework.data:spring-data-commons:2.0.10.RELEASE (*)
...
|    +--- org.springframework.data:spring-data-jpa:2.0.10.RELEASE
|    |    +--- org.springframework.data:spring-data-commons:2.0.10.RELEASE

如何解决这个问题？

Answer 1

确保AlbumReactRepository正在扩展org.springframework.data.repository.reactive.ReactiveCrudRepository

而不是

org.springframework.data.repository.CrudRepository