时间戳

首页 > 解决方案 > Spring无法在配置中创建定义抽象类的bean

java - Spring无法在配置中创建定义抽象类的bean

问题描述

public abstract class AbstractMapper<T> implements Function<SomeProducts, T> {

private final ABC abc;
private final XYZ xyz;

constructor()

some abstract methods

我有这个抽象类的两个实现

@Component
public class ProductDTOMapper extends AbstractMapper<Product> {

    constructor()

    @Override
    public Product apply(final SomeProducts products) {
        return Product.builder()
            .id()
            .build();
    }

抽象类的第二种实现

@Component
    public class CustomerDTOMapper extends AbstractMapper<CustomerDocument> {
    
        constructor()
    
        @Override
        public CustomerDocument apply(final SomeProducts products) {
            return CustomerDocument.builder()
                .id()
                .build();
        }

我用 lombok 构建 CustomerDocument 和 Product：

@Data
@Builder
@Type("typeA")
public class CustomerDocument {

some attributes

}

第二个建造者等级：

@Data
@Builder
@Type("typeB")
public class Product {

some attributes

}

在我的控制器中，我有两个映射器的实例：

@AllArgsConstructor
@RestController
@RequestMapping
public class ZController {

    private final AbstractMapper<Product> productDTOMapper;
    private final AbstractMapper<CustomerDocument> customerDTOMapper;

当我启动应用程序时，我收到此错误：

Parameter 1 of constructor in ZController required a bean of type 'x.y.z.rest.mapper.AbstractMapper' that could not be found.

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'zController' defined in file [/path/to/controller/rest/controller/ZController.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'x.y.z.rest.mapper.AbstractMapper<rest.dto.product.CustomerDocument>' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800)
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:229)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1354)

标签： javaspringspring-bootjavabeanslombok

解决方案

看看这个：

@AllArgsConstructor
@RestController
@RequestMapping
public class ZController {

    private final ProductDTOMapper productDTOMapper;
    private final CustomerDTOMapper customerDTOMapper;

如果您想使用超类进行输入，请尝试使用字段依赖注入而不是构造函数 DI，并使用混合@Qualifier和@Autowired注释。

问候，

推荐阅读