diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 425551b..3096177 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,7 +47,7 @@ jobs:
               "https://github.com/easy-4-java/${dependency}.git" \
               "${dependency_root}/${dependency}"
             for attempt in 1 2 3; do
-              if mvn -B --no-transfer-progress \
+              if sh ./mvnw -B --no-transfer-progress \
                 -f "${dependency_root}/${dependency}/pom.xml" \
                 -DskipTests -Djacoco.skip=true -Dgpg.skip=true install; then
                 break
@@ -60,7 +60,7 @@ jobs:
           done
 
       - name: Build and verify with JaCoCo coverage gate
-        run: mvn -B --no-transfer-progress clean verify
+        run: sh ./mvnw -B --no-transfer-progress clean verify
 
       - name: Upload JaCoCo coverage report
         if: always()
diff --git a/src/main/java/org/springframework/security/boot/biz/CustomWebSecurityExpressionRoot.java b/src/main/java/org/springframework/security/boot/biz/CustomWebSecurityExpressionRoot.java
index 2b37902..48a8632 100644
--- a/src/main/java/org/springframework/security/boot/biz/CustomWebSecurityExpressionRoot.java
+++ b/src/main/java/org/springframework/security/boot/biz/CustomWebSecurityExpressionRoot.java
@@ -6,6 +6,7 @@
 import org.springframework.util.StringUtils;
 
 import jakarta.servlet.http.HttpServletRequest;
+import java.util.Objects;
 import java.util.function.Supplier;
 
 /**