Allow 'on-profile' in profile specific files

Restore the ability to use `spring.config.activate.on-profile` or
`spring.profiles` in profile specific files.

Closes gh-24990

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/InvalidConfigDataPropertyException.java

@@ -52,8 +52,6 @@ public class InvalidConfigDataPropertyException extends ConfigDataException {
 		errors.add(Profiles.INCLUDE_PROFILES);
 		errors.add(ConfigurationPropertyName.of(AbstractEnvironment.ACTIVE_PROFILES_PROPERTY_NAME));
 		errors.add(ConfigurationPropertyName.of(AbstractEnvironment.DEFAULT_PROFILES_PROPERTY_NAME));
-		errors.add(ConfigurationPropertyName.of("spring.config.activate.on-profile"));
-		errors.add(ConfigurationPropertyName.of("spring.profiles"));
 		PROFILE_SPECIFIC_ERRORS = Collections.unmodifiableSet(errors);
 	}
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigDataEnvironmentPostProcessorIntegrationTests.java

@@ -680,6 +680,15 @@ class ConfigDataEnvironmentPostProcessorIntegrationTests {
 		assertThat(environment.getProperty("second.property")).isEqualTo("ball");
 	}
 
+	@Test // gh-24990
+	void runWhenHasProfileSpecificFileWithActiveOnProfileProperty() {
+		ConfigurableApplicationContext context = this.application
+				.run("--spring.config.name=application-activate-on-profile-in-profile-specific-file");
+		ConfigurableEnvironment environment = context.getEnvironment();
+		assertThat(environment.getProperty("test1")).isEqualTo("test1");
+		assertThat(environment.getProperty("test2")).isEqualTo("test2");
+	}
+
 	private Condition<ConfigurableEnvironment> matchingPropertySource(final String sourceName) {
 		return new Condition<ConfigurableEnvironment>("environment containing property source " + sourceName) {
 

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/InvalidConfigDataPropertyExceptionTests.java

@@ -125,8 +125,6 @@ class InvalidConfigDataPropertyExceptionTests {
 		throwOrWarnWhenWhenHasInvalidProfileSpecificPropertyThrowsException("spring.profiles.include");
 		throwOrWarnWhenWhenHasInvalidProfileSpecificPropertyThrowsException("spring.profiles.active");
 		throwOrWarnWhenWhenHasInvalidProfileSpecificPropertyThrowsException("spring.profiles.default");
-		throwOrWarnWhenWhenHasInvalidProfileSpecificPropertyThrowsException("spring.config.activate.on-profile");
-		throwOrWarnWhenWhenHasInvalidProfileSpecificPropertyThrowsException("spring.profiles");
 	}
 
 	@Test

spring-boot-project/spring-boot/src/test/resources/application-activate-on-profile-in-profile-specific-file-test.properties

@@ -0,0 +1,4 @@
+test1=test1
+#---
+spring.config.activate.on-profile=other
+test2=test2

spring-boot-project/spring-boot/src/test/resources/application-activate-on-profile-in-profile-specific-file.properties

@@ -0,0 +1 @@
+spring.profiles.active=test,other