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我正在学习Java Sping Boot 教程，当前的主题是可以同时使用application.properties和application.yml
我的application.properties看起来像这样：

spring.profiles.active=EN, cat
custom.username=user
custom.password=pass

我删除了它，并创建了一个application.yml。IntelliJ甚至用绿色的小开始按钮图标标记它。application.yml看起来像这样：

spring:
  profiles:
    active: EN, cat
custom:
  username: user
  password: pass

但是当我这样做时，custom属性不再被识别。IDE将它们标记为红色并显示以下错误：“此处不应有'custom'键”
我不确定这是否正确，所以我尝试了IDE在使用autocomplete编写spring.profiles.active时的建议，它是这样编写列表元素的：

spring:
  profiles:
    active:
      - EN
      - cat
custom:
  username: user
  password: pass

但这也无济于事。
我不知道从这里去哪里。我试着谷歌的问题，但唯一的命中，我得到的有点接近都只是提到，它可以使用yml，而不是properties，有些甚至使用自定义属性，如我上面显示的。
这可能是一个版本问题吗？如果有帮助的话，我的pom看起来像这样：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>myID</groupId>
    <artifactId>myArtifact</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>myName</name>
    <description>myDescription</description>
    <properties>
        <java.version>11</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

更新

要回答注解中提出的问题Mark B。这是错误消息：

Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2023-01-05T08:58:07.711+01:00 ERROR 5026 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of constructor in my.package.controllers.I18nController required a bean of type 'my.package.services.GreetingService' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Qualifier("i18nService")

The following candidates were found but could not be injected:
    - User-defined bean
    - User-defined bean
    - User-defined bean method 'primaryGreetingService' in 'GreetingServiceConfig'
    - User-defined bean method 'propertyInjectedGreetingService' in 'GreetingServiceConfig'
    - User-defined bean method 'setterInjectedGreetingService' in 'GreetingServiceConfig'
    - User-defined bean

Action:

Consider revisiting the entries above or defining a bean of type 'my.package.services.GreetingService' in your configuration.

Process finished with exit code 1

乍一看，这看起来像是我在bean的定义或配置中搞砸了一些东西，但是，当我将存储库恢复到如上所述使用application.properties文件时的状态时，一切都按预期工作。
我重新执行了这些步骤，以尽可能地隔离问题。
我所做的就是：
1.删除application.properties
1.创建application.yml
我什么都没改变。

git状态（已翻译和简化）：

On Branch master
Your Branch is in the same state as 'origin/master'.

Staged changes:
        deleted:       src/main/resources/application.properties
        new file:     src/main/resources/application.yml

Unstaged changes::
        changed:       src/main/resources/application.yml

src/main/resources/application.yml被暂存为新文件，然后具有未暂存的更改，因为IDE在创建新文件时暂存了该文件。这只是为了消除任何混淆。但这不应影响结果。

更新2

正如评论中所建议的，我尝试添加@ConfigurationProperties(prefix = "custom")，但所做的只是稍微改变了错误：

Error creating bean with name 'i18nController' defined in file
[/path/target/classes/my/package/controllers/I18nController.class]:
Unsatisfied dependency expressed through constructor parameter 0:
No qualifying bean of type 'my.package.services.GreetingService' available:
expected at least 1 bean which qualifies as autowire candidate.
Dependency annotations:
{@org.springframework.beans.factory.annotation.Qualifier("i18nService")}