diff --git a/smoke-test/spring-boot-smoke-test-websocket-tomcat/build.gradle b/smoke-test/spring-boot-smoke-test-websocket-tomcat/build.gradle
index 54a5d6aba17..449053f638f 100644
--- a/smoke-test/spring-boot-smoke-test-websocket-tomcat/build.gradle
+++ b/smoke-test/spring-boot-smoke-test-websocket-tomcat/build.gradle
@@ -25,3 +25,7 @@ dependencies {
 
 	testImplementation(project(":starter:spring-boot-starter-test"))
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
diff --git a/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/SampleWebSocketsApplicationTests.java b/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/SampleWebSocketsApplicationTests.java
index b7bdbcab54c..e28af6bffb6 100644
--- a/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/SampleWebSocketsApplicationTests.java
+++ b/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/SampleWebSocketsApplicationTests.java
@@ -80,6 +80,7 @@ class SampleWebSocketsApplicationTests {
 	static class ClientConfiguration implements CommandLineRunner {
 
 		@Value("${websocket.uri}")
+		@SuppressWarnings("NullAway.Init")
 		private String webSocketUri;
 
 		private final CountDownLatch latch = new CountDownLatch(1);
diff --git a/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/echo/CustomContainerWebSocketsApplicationTests.java b/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/echo/CustomContainerWebSocketsApplicationTests.java
index 4ef36466a17..c2f64d3df79 100644
--- a/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/echo/CustomContainerWebSocketsApplicationTests.java
+++ b/smoke-test/spring-boot-smoke-test-websocket-tomcat/src/test/java/smoketest/websocket/tomcat/echo/CustomContainerWebSocketsApplicationTests.java
@@ -95,6 +95,7 @@ class CustomContainerWebSocketsApplicationTests {
 	static class ClientConfiguration implements CommandLineRunner {
 
 		@Value("${websocket.uri}")
+		@SuppressWarnings("NullAway.Init")
 		private String webSocketUri;
 
 		private final CountDownLatch latch = new CountDownLatch(1);