BAEL-6086: Customize WebFlux Exceptions in Spring Boot 3 (#13948)

* BAEL-6086: Added code for webflux default and custom exception along with Unit Tests

* BAEL-6086: added missing import

* BAEL-6086: reformatting

* BAEL-6086: reformatted code

---------

Co-authored-by: balasr3 <balamurugan.radhakrishnan@imgarena.com>

spring-reactive-modules/spring-reactive-exceptions/pom.xml

@@ -20,7 +20,10 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-webflux</artifactId>
         </dependency>
-
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.projectlombok</groupId>
             <artifactId>lombok</artifactId>
@@ -35,6 +38,11 @@
             <artifactId>reactor-test</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.springframework</groupId>
+            <artifactId>spring-test</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>
@@ -42,8 +50,12 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <mainClass>com.baeldung.spring.reactive.customexception.CustomExceptionApplication</mainClass>
+                    <layout>JAR</layout>
+                </configuration>
             </plugin>
         </plugins>
     </build>
 
-</project>
+</project>