java - spring中通过@Inject递归调用自己的类

Question

@Named
@Scope(value = "prototype")
public class Product extends Factory

{
@Inject
protected Product product;

protected void something(){}

protected void thatThing(){ 

}

抛出以下异常

found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@javax.inject.Inject()} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java :292) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) Truncated. see log file for complete stacktrace

Answer 1

如果范围设置为原型(prototype)，Spring IoC 容器每次发出对该特定 bean 的请求时都会创建该对象的新 bean 实例。

在您的代码中，您有一个成员产品。因此，每当您需要新产品时，框架都会创建一个新的产品成员实例。并且递归地，该成员将再次创建它的成员。所以这显然是不妥当的。

我想，也许应该是这样的:

@Named
public class ProductBuilder extends Factory {

  @Inject
  protected Product product;

  protected void something(){}

  protected void thatThing(){ 

}

然后对于您的产品，将 bean 定义为原型(prototype):

@Scope(value = "prototype")
public class Product {
  ....
}