diff --git a/spring-context/src/main/java/org/springframework/context/ApplicationContext.java b/spring-context/src/main/java/org/springframework/context/ApplicationContext.java
index 32bea4d2ab4..c8c408444df 100644
--- a/spring-context/src/main/java/org/springframework/context/ApplicationContext.java
+++ b/spring-context/src/main/java/org/springframework/context/ApplicationContext.java
@@ -61,9 +61,9 @@ public interface ApplicationContext extends EnvironmentCapable, ListableBeanFact
 
 	/**
 	 * Return the unique id of this application context.
-	 * @return the unique id of the context, or {@code null} if none
+	 * @return the unique id of the context (never null as of 7.0.2)
 	 */
-	@Nullable String getId();
+	String getId();
 
 	/**
 	 * Return a name for the deployed application that this context belongs to.