diff --git a/module/spring-boot-webservices/build.gradle b/module/spring-boot-webservices/build.gradle
index 6aaf10eb52d..4668f461f30 100644
--- a/module/spring-boot-webservices/build.gradle
+++ b/module/spring-boot-webservices/build.gradle
@@ -41,3 +41,7 @@ dependencies {
 	testRuntimeOnly("io.projectreactor.netty:reactor-netty-http")
 	testRuntimeOnly("org.apache.httpcomponents.client5:httpclient5")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
diff --git a/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/autoconfigure/WebServicesPropertiesTests.java b/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/autoconfigure/WebServicesPropertiesTests.java
index 16a13ca57af..33b6db6ffa6 100644
--- a/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/autoconfigure/WebServicesPropertiesTests.java
+++ b/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/autoconfigure/WebServicesPropertiesTests.java
@@ -16,6 +16,7 @@
 
 package org.springframework.boot.webservices.autoconfigure;
 
+import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
 import static org.assertj.core.api.Assertions.assertThatIllegalArgumentException;
@@ -29,23 +30,25 @@ class WebServicesPropertiesTests {
 
 	private WebServicesProperties properties;
 
+	@BeforeEach
+	void setUp() {
+		this.properties = new WebServicesProperties();
+	}
+
 	@Test
 	void pathMustNotBeEmpty() {
-		this.properties = new WebServicesProperties();
 		assertThatIllegalArgumentException().isThrownBy(() -> this.properties.setPath(""))
 			.withMessageContaining("'path' must have length greater than 1");
 	}
 
 	@Test
 	void pathMustHaveLengthGreaterThanOne() {
-		this.properties = new WebServicesProperties();
 		assertThatIllegalArgumentException().isThrownBy(() -> this.properties.setPath("/"))
 			.withMessageContaining("'path' must have length greater than 1");
 	}
 
 	@Test
 	void customPathMustBeginWithASlash() {
-		this.properties = new WebServicesProperties();
 		assertThatIllegalArgumentException().isThrownBy(() -> this.properties.setPath("custom"))
 			.withMessageContaining("'path' must start with '/'");
 	}
diff --git a/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceMessageSenderFactoryTests.java b/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceMessageSenderFactoryTests.java
index d407802c73c..7726370aab4 100644
--- a/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceMessageSenderFactoryTests.java
+++ b/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceMessageSenderFactoryTests.java
@@ -94,6 +94,7 @@ class WebServiceMessageSenderFactoryTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void httpWithFactoryAndSettingsWhenFactoryIsNullThrowsException() {
 		assertThatIllegalArgumentException().isThrownBy(() -> WebServiceMessageSenderFactory.http(null, null))
 			.withMessage("'requestFactoryBuilder' must not be null");
@@ -113,8 +114,7 @@ class WebServiceMessageSenderFactoryTests {
 
 	private ClientHttpRequestFactory getRequestFactory(WebServiceMessageSender sender) {
 		assertThat(sender).isInstanceOf(ClientHttpRequestMessageSender.class);
-		ClientHttpRequestFactory requestFactory = ((ClientHttpRequestMessageSender) sender).getRequestFactory();
-		return requestFactory;
+		return ((ClientHttpRequestMessageSender) sender).getRequestFactory();
 	}
 
 }
diff --git a/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceTemplateBuilderTests.java b/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceTemplateBuilderTests.java
index 14136d5d763..049bff9d3d3 100644
--- a/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceTemplateBuilderTests.java
+++ b/module/spring-boot-webservices/src/test/java/org/springframework/boot/webservices/client/WebServiceTemplateBuilderTests.java
@@ -62,9 +62,11 @@ class WebServiceTemplateBuilderTests {
 	private final WebServiceTemplateBuilder builder = new WebServiceTemplateBuilder();
 
 	@Mock
+	@SuppressWarnings("NullAway.Init")
 	private WebServiceMessageSender messageSender;
 
 	@Mock
+	@SuppressWarnings("NullAway.Init")
 	private ClientInterceptor interceptor;
 
 	@Test
@@ -100,6 +102,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void messageSendersWhenSendersAreAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.messageSenders((WebServiceMessageSender[]) null))
@@ -107,6 +110,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void messageSendersCollectionWhenSendersAreAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.messageSenders((Collection<? extends WebServiceMessageSender>) null))
@@ -128,6 +132,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void additionalMessageSendersWhenSendersAreAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.additionalMessageSenders((WebServiceMessageSender[]) null))
@@ -135,6 +140,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void additionalMessageSendersCollectionWhenSendersAreAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(
@@ -159,12 +165,14 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void interceptorsWhenInterceptorsAreNullShouldThrowException() {
 		assertThatIllegalArgumentException().isThrownBy(() -> this.builder.interceptors((ClientInterceptor[]) null))
 			.withMessageContaining("'interceptors' must not be null");
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void interceptorsCollectionWhenInterceptorsAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.interceptors((Collection<? extends ClientInterceptor>) null))
@@ -186,6 +194,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void additionalInterceptorsWhenInterceptorsAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.additionalInterceptors((ClientInterceptor[]) null))
@@ -193,6 +202,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void additionalInterceptorsCollectionWhenInterceptorsAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.additionalInterceptors((Set<ClientInterceptor>) null))
@@ -219,6 +229,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void customizersWhenCustomizersAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.customizers((WebServiceTemplateCustomizer[]) null))
@@ -226,6 +237,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void customizersCollectionWhenCustomizersAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.customizers((Collection<? extends WebServiceTemplateCustomizer>) null))
@@ -259,6 +271,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void additionalCustomizersWhenCustomizersAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(() -> this.builder.additionalCustomizers((WebServiceTemplateCustomizer[]) null))
@@ -266,6 +279,7 @@ class WebServiceTemplateBuilderTests {
 	}
 
 	@Test
+	@SuppressWarnings("NullAway") // Test null check
 	void additionalCustomizersCollectionWhenCustomizersAreNullShouldThrowException() {
 		assertThatIllegalArgumentException()
 			.isThrownBy(
@@ -336,7 +350,9 @@ class WebServiceTemplateBuilderTests {
 	void setDefaultUri() {
 		URI uri = URI.create("http://localhost:8080");
 		WebServiceTemplate webServiceTemplate = this.builder.setDefaultUri(uri.toString()).build();
-		assertThat(webServiceTemplate.getDestinationProvider().getDestination()).isEqualTo(uri);
+		DestinationProvider destinationProvider = webServiceTemplate.getDestinationProvider();
+		assertThat(destinationProvider).isNotNull();
+		assertThat(destinationProvider.getDestination()).isEqualTo(uri);
 	}
 
 	@Test