Respect spring.profiles.active in #addActiveProfile

Prior to this commit, calls to ConfigurableEnvironment#addActiveProfile
would cause any active profile values provided via the
"spring.profiles.active" property to be ignored.

Now these two mechanisms can be used in conjunction and work as
expected.

Issue: SPR-9944

spring-context/src/test/java/org/springframework/context/support/EnvironmentIntegrationTests.java

@@ -17,7 +17,6 @@
 package org.springframework.context.support;
 
 import org.junit.Test;
-
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.ConfigurableApplicationContext;
 import org.springframework.context.annotation.AnnotationConfigApplicationContext;
@@ -34,7 +33,6 @@ import static org.junit.Assert.*;
  */
 public class EnvironmentIntegrationTests {
 
-	@SuppressWarnings("unchecked")
 	@Test
 	public void repro() {
 		ConfigurableApplicationContext parent = new GenericApplicationContext();

spring-core/src/main/java/org/springframework/core/env/AbstractEnvironment.java

@@ -240,7 +240,8 @@ public abstract class AbstractEnvironment implements ConfigurableEnvironment {
 		Assert.notNull(profiles, "Profile array must not be null");
 		this.activeProfiles.clear();
 		for (String profile : profiles) {
-			addActiveProfile(profile);
+			validateProfile(profile);
+			this.activeProfiles.add(profile);
 		}
 	}
 
@@ -249,9 +250,11 @@ public abstract class AbstractEnvironment implements ConfigurableEnvironment {
 			this.logger.debug(format("Activating profile '%s'", profile));
 		}
 		validateProfile(profile);
+		doGetActiveProfiles();
 		this.activeProfiles.add(profile);
 	}
 
+
 	public String[] getDefaultProfiles() {
 		return StringUtils.toStringArray(doGetDefaultProfiles());
 	}

spring-core/src/test/java/org/springframework/core/env/StandardEnvironmentTests.java

@@ -185,6 +185,16 @@ public class StandardEnvironmentTests {
 		assertThat(environment.getActiveProfiles().length, is(5));
 	}
 
+	@Test
+	public void addActiveProfile_whenActiveProfilesPropertyIsAlreadySet() {
+		ConfigurableEnvironment env = new StandardEnvironment();
+		assertThat(env.getProperty(ACTIVE_PROFILES_PROPERTY_NAME), nullValue());
+		env.getPropertySources().addFirst(new MockPropertySource().withProperty(ACTIVE_PROFILES_PROPERTY_NAME, "p1"));
+		assertThat(env.getProperty(ACTIVE_PROFILES_PROPERTY_NAME), equalTo("p1"));
+		env.addActiveProfile("p2");
+		assertThat(env.getActiveProfiles(), arrayContaining("p1", "p2"));
+	}
+
 	@Test
 	public void reservedDefaultProfile() {
 		assertThat(environment.getDefaultProfiles(), equalTo(new String[]{RESERVED_DEFAULT_PROFILE_NAME}));