无法从BeanPostProcessor中的占位符获取值

我将Spring与Spring Boot BOM 2.4.0随附的旧版Tomcat应用程序（而非Spring Boot）一起使用，问题类似于无法使用Spring Expression Language的问题，但我有特定情况。

如果我有一个与@Value("${spring.kafka.maximumRequestSize:15728640}")以下相关的类

@Configuration
@Order
public class KafkaTracingDecorator implements  ApplicationContextAware {
    private KafkaTracing kafkaTracing;

    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {

        kafkaTracing = applicationContext.getBean(KafkaTracing.class);
    }
}

有用。以下内容也可以，但是在后处理器上我什么也不做

@Configuration
@Order
public class KafkaTracingDecorator implements BeanPostProcessor, ApplicationContextAware {

    @Override
    public Object postProcessAfterInitialization(final Object bean, final String beanName) throws BeansException {

        return bean;
    }

    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {

//        kafkaTracing = applicationContext.getBean(KafkaTracing.class);
    }
}

但是，当我尝试实行BeanPostProcessor以实现Decorator模式是这样

@Configuration
@Order
public class KafkaTracingDecorator implements BeanPostProcessor, ApplicationContextAware {

    private KafkaTracing kafkaTracing;

    @Override
    public Object postProcessBeforeInitialization(final Object bean, final String beanName) throws BeansException {

        if (bean instanceof KafkaProducer) {
            return kafkaTracing.producer((KafkaProducer) bean);
        } else if (bean instanceof KafkaConsumer) {
            return kafkaTracing.consumer((KafkaConsumer) bean);
        } else {
            return bean;
        }
    }

    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {

        kafkaTracing = applicationContext.getBean(KafkaTracing.class);
    }
}

我Caused by: java.lang.NumberFormatException: For input string: "${spring.kafka.maximumRequestSize:15728640}"在创建WebApplicationContext时得到。

即使我不使用该值，也不会发生这种情况，也会发生这种情况

@Configuration
@Order
public class KafkaTracingDecorator implements BeanPostProcessor, ApplicationContextAware {

    private KafkaTracing kafkaTracing;

    @Override
    public Object postProcessBeforeInitialization(final Object bean, final String beanName) throws BeansException {

        return bean;
    }

    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) throws BeansException {

        kafkaTracing = applicationContext.getBean(KafkaTracing.class);
    }
}

这是一个非常简化的示例，同样失败了：

@Configuration
public class KafkaTracingDecorator implements BeanPostProcessor {

    @Value("${spring.kafka.maximumRequestSize:15728640}")
    private int maxRequestSize;

}

（请注意，这在Spring Boot上可以正常工作，因此可能与Spring的非启动用法有关）

导致错误的部分堆栈跟踪未列出任何自定义代码：

    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:213)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.registerBeanPostProcessors(PostProcessorRegistrationDelegate.java:270)
    at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:761)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:566)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:401)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:292)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4689)

MVCE已添加：https : //github.com/trajano/spring-beanpostproc-mvce链接到GitHub问题，以防它是一个错误https://github.com/spring-projects/spring-framework/issues/26571而不是使用问题。