java - spring boot 1.3 maven模块无法 Autowiring

Question

我使用的是 spring boot 1.3，我有一个 Maven 父项目，它有两个 Maven 模块，一个我称为 demo-web ，另一个我称为 demo-service。

我需要demo-web的 Controller 可以调用demo-service的方法。

我的项目结构如下。

我的父 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>com.jiabangougo</groupId>
<artifactId>jiabangougo-demo-parent</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
    <module>jiabangougo-demo-web</module>
    <module>jiabangougo-demo-service</module>
</modules>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.0.RELEASE</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-data-jpa</artifactId>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>

</dependencies>

我的demo-web pom

<?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">
<parent>
    <artifactId>jiabangougo-demo-parent</artifactId>
    <groupId>com.jiabangougo</groupId>
    <version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>jiabangougo-demo-web</artifactId>

<dependencies>
    <dependency>
        <groupId>com.jiabangougo</groupId>
        <artifactId>jiabangougo-demo-service</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

和我的演示服务 POM

<?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">
<parent>
    <artifactId>jiabangougo-demo-parent</artifactId>
    <groupId>com.jiabangougo</groupId>
    <version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>jiabangougo-demo-service</artifactId>

这是ProductController.java

@RestController
public class ProductController {

    @Autowired
    ProductService productService;

    @RequestMapping("/product/{name}")
    Product getByName(String name){
        return productService.findByName(name);
    }

}

这是我的ProductService.java

public interface ProductService {
    Product findByName(String name);
}

还有我的ProductServiceImpl.java

@Service
public class ProductServiceImpl implements ProductService {

    @Autowired
    private ProductRepository productRepository;

    @Override
    public Product findByName(String name) {
        return productRepository.findByName(name);
    }
}

因为这只是一个测试代码，非常简单。但是当我在IDEA14中启动tomcat时，出现错误。

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.jiabangougo.service.service.ProductService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

错误日志显示:ProductService 无法通过 Spring Boot Autowiring 。

当我使用spring boot 1.2.5时，没有编译错误，但boot 1.3有。我不知道这有什么问题。谢谢。

完整的错误堆栈在这里:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'productController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.jiabangougo.service.service.ProductService com.jiabangougo.web.controller.ProductController.productService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.jiabangougo.service.service.ProductService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1214) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:838) ~[spring-context-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:537) ~[spring-context-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118) ~[spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:752) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:347) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:295) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1112) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1101) [spring-boot-1.3.0.RELEASE.jar:1.3.0.RELEASE]
at com.jiabangougo.web.Application.main(Application.java:14) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_65]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_65]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_65]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_65]
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140) [idea_rt.jar:na]

    Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.jiabangougo.service.service.ProductService com.jiabangougo.web.controller.ProductController.productService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.jiabangougo.service.service.ProductService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:573) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
... 22 common frames omitted


        Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.jiabangougo.service.service.ProductService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1373) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1119) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1014) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:545) ~[spring-beans-4.2.3.RELEASE.jar:4.2.3.RELEASE]
... 24 common frames omitted

Answer 1

我能够在本地配置这个项目，经过一些修复后它就可以工作了。

产品 Controller :

    import com.example.stackoverflow.domain.Product;
    import com.example.stackoverflow.service.ProductService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
    import org.springframework.context.annotation.ComponentScan;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;

    import java.util.List;

    @RestController
    @EnableAutoConfiguration
    @ComponentScan("com.example.stackoverflow")
    public class ProductController {

        @Autowired
        ProductService productService;

        @RequestMapping(value = "/product/{name}", method = RequestMethod.GET)
        Product getByName(@PathVariable String name) {
            return productService.findByName(name);
        }

        @RequestMapping(value = "/products", method = RequestMethod.GET)
        List<Product> getProducts() {
            return productService.getAllProducts();
        }

        public static void main(String[] args) throws Exception {
            SpringApplication.run(ProductController.class, args);
        }
    }

产品服务:

    import com.example.stackoverflow.domain.Product;
    import java.util.List;

    public interface ProductService {
        Product findByName(String name);
        List<Product> getAllProducts();
    }

产品服务Impl:

    import com.example.stackoverflow.domain.Product;
    import com.example.stackoverflow.repository.ProductRepository;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    import java.util.List;

    @Component
    public class ProductServiceImpl implements ProductService {

        @Autowired
        private ProductRepository productRepository;

        public Product findByName(String name) {
            return productRepository.findByName(name);
        }

        public List<Product> getAllProducts() {
            return productRepository.getAllProducts();
        }
    }

产品存储库:

    import com.example.stackoverflow.domain.Product;
    import java.util.List;

    public interface ProductRepository {
        Product findByName(String name);
        List<Product> getAllProducts();
    }

产品存储库Impl:

    import com.example.stackoverflow.domain.Product;
    import org.springframework.stereotype.Component;
    import java.util.Arrays;
    import java.util.List;

    @Component
    public class ProductRepositoryImpl implements ProductRepository {

        private List<Product> products = Arrays.asList(
                new Product("Coca Cola", "drink"),
                new Product("Pepsi", "drink"));

        public Product findByName(String name) {
            for (Product product : products) {
                if (product.getName().equalsIgnoreCase(name)) {
                    return product;
                }
            }
            return null;
        }

        public List<Product> getAllProducts() {
            return products;
        }
    }

产品:

    import java.util.Objects;

    public class Product {
        private String name;
        private String category;

        public Product(String name, String category) {
            this.name = name;
            this.category = category;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public String getCategory() {
            return category;
        }

        public void setCategory(String category) {
            this.category = category;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Product product = (Product) o;
            return Objects.equals(name, product.name) &&
                    Objects.equals(category, product.category);
        }

        @Override
        public int hashCode() {
            return Objects.hash(name, category);
        }

        @Override
        public String toString() {
            return "Product{" +
                    "name='" + name + '\'' +
                    ", category='" + category + '\'' +
                    '}';
        }
    }

父 POM:

<modules>
        <module>demo-web</module>
        <module>demo-service</module>
    </modules>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.3.0.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

从 ProductController 运行应用程序后，您可以检查这些 url:

    http://localhost:8080/product/pepsi

    http://localhost:8080/products

您还可以在我的 github page 上查看源代码