Enable nullability checking for tests in remaining smoke tests

smoke-test/spring-boot-smoke-test-jackson2-mixed/build.gradle

@@ -27,3 +27,7 @@ dependencies {
 
 	testImplementation(project(":starter:spring-boot-starter-webmvc-test"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

smoke-test/spring-boot-smoke-test-jackson2-only/build.gradle

@@ -32,3 +32,7 @@ dependencies {
 	}
 	testImplementation(project(":test-support:spring-boot-test-support"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

smoke-test/spring-boot-smoke-test-jackson2-only/src/test/java/smoketest/jackson2/only/JsonPojo.java

@@ -16,30 +16,32 @@
 
 package smoketest.jackson2.only;
 
+import org.jspecify.annotations.Nullable;
+
 /**
  * POJO for serialization to JSON.
  *
  * @author Andy Wilkinson
  */
 class JsonPojo {
 
-	private String alpha;
+	private @Nullable String alpha;
 
-	private String bravo;
+	private @Nullable String bravo;
 
-	String getAlpha() {
+	@Nullable String getAlpha() {
 		return this.alpha;
 	}
 
-	void setAlpha(String alpha) {
+	void setAlpha(@Nullable String alpha) {
 		this.alpha = alpha;
 	}
 
-	String getBravo() {
+	@Nullable String getBravo() {
 		return this.bravo;
 	}
 
-	void setBravo(String bravo) {
+	void setBravo(@Nullable String bravo) {
 		this.bravo = bravo;
 	}
 

smoke-test/spring-boot-smoke-test-jersey/build.gradle

@@ -30,3 +30,7 @@ dependencies {
 	testImplementation(project(":starter:spring-boot-starter-jersey-test"))
 	testImplementation(project(":module:spring-boot-restclient"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

smoke-test/spring-boot-smoke-test-log4j2/build.gradle

@@ -32,3 +32,7 @@ dependencies {
 
 	testImplementation(project(":starter:spring-boot-starter-test"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}

smoke-test/spring-boot-smoke-test-secure-jersey/build.gradle

@@ -28,3 +28,7 @@ dependencies {
 	testImplementation(project(":starter:spring-boot-starter-jersey-test"))
 	testImplementation(project(":module:spring-boot-restclient"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}