BAEL-5951: Spring Boot 3 Sample for Native Image builds incl. Runtime Hints (#13047)

* Update Spring Boot, Spring Native and Native Maven Plugin versions

* BAEL-5951: Spring Boot 3 Sample for Native Image builds incl. Runtime Hints

* BAEL-5951: Configure POMs and add Swagger UI runtime hints

* BAEL-5951: Remove Swagger UI runtime hints

* BAEL-5951: Remove Spring Boot3 parent POM from profiles because of JDK17 dependency during build (building the parent POM is even not necessary)

* BAEL-5951: Add tests

* BAEL-5951: Fix tests (PMD naming conventions)

spring-boot-modules/spring-boot-3-native/src/test/java/com/baeldung/sample/JacksonAutoConfigurationIntegrationTest.java

@@ -0,0 +1,23 @@
+package com.baeldung.sample;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+class JacksonAutoConfigurationIntegrationTest {
+
+    @Autowired
+    ObjectMapper mapper;
+
+    @Test
+    void shouldUseSnakeCasePropertyNamingStrategy() {
+        assertThat(mapper.getPropertyNamingStrategy())
+          .isSameAs(PropertyNamingStrategies.SNAKE_CASE);
+    }
+
+}

spring-boot-modules/spring-boot-3-native/src/test/java/com/baeldung/sample/JacksonRuntimeHintsUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.sample;
+
+import com.fasterxml.jackson.databind.PropertyNamingStrategies;
+import org.junit.jupiter.api.Test;
+import org.springframework.aot.hint.RuntimeHints;
+import org.springframework.aot.hint.predicate.RuntimeHintsPredicates;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class JacksonRuntimeHintsUnitTest {
+
+    @Test
+    void shouldRegisterSnakeCasePropertyNamingStrategy() {
+        // arrange
+        final var hints = new RuntimeHints();
+        final var expectSnakeCaseHint = RuntimeHintsPredicates
+          .reflection()
+          .onField(PropertyNamingStrategies.class, "SNAKE_CASE");
+        // act
+        new JacksonRuntimeHints.PropertyNamingStrategyRegistrar()
+          .registerHints(hints, getClass().getClassLoader());
+        // assert
+        assertThat(expectSnakeCaseHint).accepts(hints);
+
+    }
+
+}