@EnableConfigurationProperties(MyConfig.class) generated bean name does not work in spring-integration

Question

I have a config class with @ConfigurationProperties as follows. I am able to populate systemConfigMap from application.yaml in the MyConfig class as seen below

@ConfigurationProperties(prefix = "my-config")
@ConstructorBinding
@AllArgsConstructor
public class MyConfig {

    /**
     * A Configuration Map of multiple Systems
     */
    private Map<String, SystemConfig> systemConfigMap;
    
}

the main class as

@EnableConfigurationProperties(MyConfig.class)
public class SpringApp {
    public static void main(String[] args) {
        SpringApplication.run(SpringApp.class, args);
    }
}

The problem is that the generated bean name is my-config-a.b.c.config.MyConfig, which I am not able to use in payload-expression on spring integration http inbound gateway, I guess since it has "-" in it.

How can I specify the bean name for the generated bean MyConfig?

EDIT : HTTP Gateway Config

 <int:channel id="myConfigListChannel" />
 <int-http:inbound-gateway request-channel="myConfigListChannel"
                              path="/data"
                              error-channel="errorChannel"
                              supported-methods="GET"
                              payload-expression="@my-config-a.b.c.config.MyConfig.getSystemConfigMap().values()"
    />

I want to load the systemConfigMap values when /data is requested to start processing the flow.

Show, please, how do you use it in that expression? And what is the goal to use it at all in the expression like that? — Artem Bilan, Aug 26 '20 at 19:56
Added via EDIT to the question. I want to trigger the flow which starts by reading `systemConfigMap` values, externally hence added an `HTTP Inbound Gateway` only to trigger the flow and return the results. Related to https://stackoverflow.com/questions/63598100/spring-integration-block-flow-having-loop-and-multiple-http-and-async-sqs — Nikhil, Aug 26 '20 at 20:05

score 1 · Accepted Answer · answered Aug 26 '20 at 20:11

When you try to use a complex bean id like yours my-config-a.b.c.config.MyConfig in the SpEL expression, you need to wrap it into the literal. Otherwise it understands an id until the first . which is treat as method/property reference to evaluate on a possible bean evaluate before. So, it tries to find a bean like my-config-a and then tries to get access to its b property, which is fully false in your case.

To fix your problem you need to do like this:

 payload-expression="@'my-config-a.b.c.config.MyConfig'.systemConfigMap.values()"

Another trick would be like your MyConfig injection into some bean with really meaningful bean name and use that one from the expression as a delegate.

Thank you, that works! I did try adding the single quotes earlier but Intellij showed error, so did not run the app to test, damn. Sorry for the trouble, thanks again ! — Nikhil, Aug 26 '20 at 20:17
Or you can just add `MyConfig` as a `@Bean` (or ``) instead of adding it to `@EnableConfigurationProperties`. — Gary Russell, Aug 26 '20 at 20:18

@EnableConfigurationProperties(MyConfig.class) generated bean name does not work in spring-integration

1 Answers1