diff --git a/spring-reactive-modules/spring-reactive-exceptions/pom.xml b/spring-reactive-modules/spring-reactive-exceptions/pom.xml
index 1f24f9cd1c..8cde579ddb 100644
--- a/spring-reactive-modules/spring-reactive-exceptions/pom.xml
+++ b/spring-reactive-modules/spring-reactive-exceptions/pom.xml
@@ -61,4 +61,10 @@
         </plugins>
     </build>
 
+    <properties>
+        <spring-boot.version>3.2.2</spring-boot.version>
+        <junit-jupiter.version>5.10.2</junit-jupiter.version>
+        <maven.compiler.release>17</maven.compiler.release>
+    </properties>
+
 </project>
diff --git a/spring-reactive-modules/spring-reactive-exceptions/src/main/java/com/baeldung/spring/reactive/customexception/model/ErrorDetails.java b/spring-reactive-modules/spring-reactive-exceptions/src/main/java/com/baeldung/spring/reactive/customexception/model/ErrorDetails.java
index a4ca566c71..357998dda1 100644
--- a/spring-reactive-modules/spring-reactive-exceptions/src/main/java/com/baeldung/spring/reactive/customexception/model/ErrorDetails.java
+++ b/spring-reactive-modules/spring-reactive-exceptions/src/main/java/com/baeldung/spring/reactive/customexception/model/ErrorDetails.java
@@ -11,11 +11,11 @@ public enum ErrorDetails {
 
     API_USER_NOT_FOUND(123, "User not found", "http://example.com/123");
     @Getter
-    private Integer errorCode;
+    private final Integer errorCode;
     @Getter
-    private String errorMessage;
+    private final String errorMessage;
     @Getter
-    private String referenceUrl;
+    private final String referenceUrl;
 
     ErrorDetails(Integer errorCode, String errorMessage, String referenceUrl) {
         this.errorCode = errorCode;
diff --git a/spring-reactive-modules/spring-reactive-exceptions/src/test/java/com/baeldung/spring/reactive/customexception/controller/UserControllerUnitTest.java b/spring-reactive-modules/spring-reactive-exceptions/src/test/java/com/baeldung/spring/reactive/customexception/controller/UserControllerUnitTest.java
index 150d0b08a6..c4306e6e62 100644
--- a/spring-reactive-modules/spring-reactive-exceptions/src/test/java/com/baeldung/spring/reactive/customexception/controller/UserControllerUnitTest.java
+++ b/spring-reactive-modules/spring-reactive-exceptions/src/test/java/com/baeldung/spring/reactive/customexception/controller/UserControllerUnitTest.java
@@ -1,6 +1,6 @@
 package com.baeldung.spring.reactive.customexception.controller;
 
-import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
@@ -55,7 +55,7 @@ class UserControllerUnitTest {
         // Then
         assertNotNull(problemDetail);
         assertNotNull(problemDetail.getProperties().get("errors"));
-        List<LinkedHashMap> errors = (List<LinkedHashMap>) problemDetail.getProperties().get("errors");
+        List<LinkedHashMap<String,Object>> errors = (List<LinkedHashMap<String,Object>>) problemDetail.getProperties().get("errors");
         assertEquals(ErrorDetails.API_USER_NOT_FOUND.getErrorCode().toString(),
           errors.get(0).get("code"));
         assertEquals(ErrorDetails.API_USER_NOT_FOUND.getErrorMessage().toString(),