org.test.api.controller.CheckerController 中的字段检查器需要找不到的 'org.test.api.checker.Checker' 类型的 Bean

Question

我从Intellijidea运行Spring应用程序时会出现以下错误。

2017-04-20 18:20:50.645 ERROR 28680 --- [main] o.s.b.d.LoggingFailureAnalysisReporter   :
***************************
APPLICATION FAILED TO START
***************************
Description:
Field checker in org.test.api.controller.CheckerController required a bean of type 'org.test.api.checker.Checker' that could not be found.

Action:
Consider defining a bean of type 'org.test.api.checker.Checker' in your configuration.

但是，我在路径org.test.api.checker.Checker中有Checker类。

这是CheckerController类的示例代码：

@RestController
@RequestMapping("/api/{clientId}")
public class CheckerController {
    @Autowired
    Validator validator;
    @Autowired
    @Qualifier("Checker")
    Checker checker;

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.registerCustomEditor(Context.class, new ContextEditor());
    }
@RequestMapping(value = "/{userId}/{sessionId}/check", method = RequestMethod.GET)
public CheckResults check(@PathVariable String clientId,
                                 @PathVariable String userId,
                                 @PathVariable String sessionId) {
    CheckRequest checkRequest = new CheckRequest(CheckRequest.TYPE_1, clientId, userId, sessionId);
    this.validateRequest(checkRequest);
    return checker.check(checkRequest);
}
}

类Checker：

public interface Checker {
    CheckResults check(CheckRequest request);
}

如何解决此问题？

更新：

@Service
public class CheckerImpl implements Checker {
    @Override
    public CheckResults check(CheckRequest request)
    {
       // ...
    }
}

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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>org.test</groupId>
    <artifactId>mytestapi</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spark.version>1.6.1</spark.version>
        <es.version>2.2.0</es.version>
    </properties>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.5.BUILD-SNAPSHOT</version>
    </parent>
    <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>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-elasticsearch</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.github.spullara.mustache.java</groupId>
            <artifactId>compiler</artifactId>
            <version>0.9.1</version>
        </dependency>
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>${es.version}</version>
        </dependency>
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.9.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.jena</groupId>
            <artifactId>jena-tdb</artifactId>
            <version>3.0.0</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20160810</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-sql_2.10</artifactId>
            <version>${spark.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.10.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.8.2</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-scala_2.10</artifactId>
            <version>2.8.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.lucene</groupId>
            <artifactId>lucene-queryparser</artifactId>
            <version>6.5.0</version>
        </dependency>
    </dependencies>
    <repositories>
        <repository>
            <id>spring-releases</id>
            <url>https://repo.spring.io/libs-release</url>
        </repository>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/libs-snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>spring-releases</id>
            <url>https://repo.spring.io/libs-release</url>
        </pluginRepository>
    </pluginRepositories>
</project>

Answer 1

当您通过 @Qualifier("Checker")自动启动时，定义了checkerimpl类中的 @Service中的bean名称。

@Service("Checker")
public class CheckerImpl implements Checker {
    @Override
    public CheckResults check(CheckRequest request)
    {
       // ...
    }
}

Answer 2

原始错误是由于使用无效的预选赛@Qualifier("Checker")。在上下文中，没有用于ID"检查器"的BEAN。由于使用其他@Qualifier只有一个合适的实施是没有用的。