diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/annotation/ImportCandidates.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/annotation/ImportCandidates.java
index efecb9bfc2ae..627e56ad8b93 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/annotation/ImportCandidates.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/annotation/ImportCandidates.java
@@ -27,9 +27,8 @@
 import java.util.Iterator;
 import java.util.List;
 
-import org.jetbrains.annotations.NotNull;
-
 import org.springframework.core.io.UrlResource;
+import org.springframework.lang.NonNull;
 import org.springframework.util.Assert;
 
 /**
@@ -54,7 +53,7 @@ private ImportCandidates(List<String> candidates) {
 		this.candidates = Collections.unmodifiableList(candidates);
 	}
 
-	@NotNull
+	@NonNull
 	@Override
 	public Iterator<String> iterator() {
 		return this.candidates.iterator();
diff --git a/src/checkstyle/checkstyle.xml b/src/checkstyle/checkstyle.xml
index f0f1aa09ee9d..b0d8bf8796c8 100644
--- a/src/checkstyle/checkstyle.xml
+++ b/src/checkstyle/checkstyle.xml
@@ -13,7 +13,7 @@
 			name="com.puppycrawl.tools.checkstyle.checks.imports.IllegalImportCheck">
 			<property name="regexp" value="true" />
 			<property name="illegalPkgs"
-				value="^sun.*, ^org\.apache\.commons\.(?!compress|dbcp2|logging|pool2).*, ^com\.datastax\.oss\.driver\.shaded.*, ^com\.google\.common.*, ^io\.micrometer\.shaded.*, ^org\.testcontainers\.shaded.*" />
+				value="^sun.*, ^org\.apache\.commons\.(?!compress|dbcp2|logging|pool2).*, ^org\.jetbrains\.annotations.*, ^com\.datastax\.oss\.driver\.shaded.*, ^com\.google\.common.*, ^io\.micrometer\.shaded.*, ^org\.testcontainers\.shaded.*" />
 			<property name="illegalClasses"
 				value="^com\.hazelcast\.util\.Base64, ^org\.junit\.rules\.ExpectedException, ^org\.mockito\.InjectMocks, ^org\.slf4j\.LoggerFactory, ^org.springframework.context.annotation.ScannedGenericBeanDefinition, ^reactor\.core\.support\.Assert"/>
 		</module>