OpenShift 上的 Spring Bean 注入失败

Question

我在我们的 Spring Boot 应用程序中添加了一个带有 Spring Messaging 的新 Spring Integration 配置。 该应用程序在我的 MAC 上正确部署和运行。

然而， 当部署到 OpenShift（使用 OpenJDK）或 Docker 运行时 部署失败并出现以下错误：

Unsatisfied dependency expressed through constructor parameter 0;
nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:
No qualifying bean of type 'org.springframework.messaging.MessageChannel' available:
expected at least 1 bean which qualifies as autowire candidate.
Dependency annotations:
{@org.springframework.beans.factory.annotation.Qualifier(value=ftpChannel)}

下面是代码失败并出现相同错误的简化版本：

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.messaging.MessageChannel;
import org.springframework.stereotype.Service;


@Service
public class FtpService {

    private final MessageChannel ftpClientInboundChannel;

    public FtpService(@Qualifier("ftpChannel") MessageChannel ftpClientInboundChannel) {
        this.ftpClientInboundChannel = ftpClientInboundChannel;
    }
}

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.integration.annotation.IntegrationComponentScan;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.messaging.Message;
import org.springframework.messaging.MessageHandler;
import org.springframework.messaging.MessagingException;


@Configuration
@IntegrationComponentScan
public class FtpClientConfiguration {

    @Bean
    @ServiceActivator(inputChannel = "ftpChannel")
    public MessageHandler ftpPayableHandler() {

        return new MessageHandler() {
            @Override
            public void handleMessage(Message<?> message) throws MessagingException {

            }
        };
    }

}

Answer 1

通过添加消息通道 bean 解决了该问题：

@Bean
public MessageChannel ftpChannel() {
    return new DirectChannel();
}