Intellij IDEA complains cannot resolve spring boot properties but they work fine

Can not resolve configuration property '...

I have no problem accessing my properties through the @Value annotation or through an autowired Evironment. But all of my own defined properties get this warning in IDEA. What should I be doing to get IDEA to recognize these and not bother me?

In order for IntelliJ IDEA to know your Spring Boot properties, you can define Spring Boot configuration metadata in your project.

Option 1:

If you can use a @ConfigurationProperties-annotated class for your properties, you can add the Spring Boot configuration annotation processor to your classpath and IntelliJ IDEA will generate the configuration metadata for you in target or out:

Maven:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-configuration-processor</artifactId>
    <optional>true</optional>
</dependency>

Gradle:

implementation 'org.springframework.boot:spring-boot-configuration-processor'

Option 2:

Create the configuration metadata file yourself src/main/resources/META-INF/spring-configuration-metadata.json:

Content:

{
  "properties": [
    {
      "name": "myapp.someprop",
      "type": "java.lang.String"
    },
    {
      "name": "myapp.someintprop",
      "type": "java.lang.Integer"
    }
  ]
}