diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/client/MetricsRestTemplateCustomizerTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/client/MetricsRestTemplateCustomizerTests.java
index 00c88bbe8a..697f2a133a 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/client/MetricsRestTemplateCustomizerTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/client/MetricsRestTemplateCustomizerTests.java
@@ -185,7 +185,6 @@ class MetricsRestTemplateCustomizerTests {
 		assertThat(restTemplate.getForObject(URI.create("/second/456"), String.class)).isEqualTo("OK");
 		this.registry.get("http.client.requests").tags("uri", "/second/456").timer();
 		this.mockServer.verify();
-
 	}
 
 	private static final class TestInterceptor implements ClientHttpRequestInterceptor {
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilterTests.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilterTests.java
index c6c7a5195b..15232266c5 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilterTests.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/reactive/server/MetricsWebFilterTests.java
@@ -142,7 +142,7 @@ class MetricsWebFilterTests {
 
 	class FaultyWebFluxTagsProvider extends DefaultWebFluxTagsProvider {
 
-		private volatile AtomicBoolean fail = new AtomicBoolean(false);
+		private final AtomicBoolean fail = new AtomicBoolean(false);
 
 		FaultyWebFluxTagsProvider() {
 			super(true);
diff --git a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/FaultyWebMvcTagsProvider.java b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/FaultyWebMvcTagsProvider.java
index 111082fdf1..57701d2713 100644
--- a/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/FaultyWebMvcTagsProvider.java
+++ b/spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/FaultyWebMvcTagsProvider.java
@@ -31,7 +31,7 @@ import io.micrometer.core.instrument.Tag;
  */
 class FaultyWebMvcTagsProvider extends DefaultWebMvcTagsProvider {
 
-	private volatile AtomicBoolean fail = new AtomicBoolean(false);
+	private final AtomicBoolean fail = new AtomicBoolean(false);
 
 	FaultyWebMvcTagsProvider() {
 		super(true);
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/builder/SpringApplicationBuilder.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/builder/SpringApplicationBuilder.java
index ad8ac8bc08..adae2bed9f 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/builder/SpringApplicationBuilder.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/builder/SpringApplicationBuilder.java
@@ -100,7 +100,7 @@ public class SpringApplicationBuilder {
 	/**
 	 * Creates a new {@link org.springframework.boot.SpringApplication} instances from the
 	 * given sources. Subclasses may override in order to provide a custom subclass of
-	 * {@link org.springframework.boot.SpringApplication}
+	 * {@link org.springframework.boot.SpringApplication}.
 	 * @param sources the sources
 	 * @return the {@link org.springframework.boot.SpringApplication} instance
 	 * @since 1.1.0
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/env/RandomValuePropertySourceTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/env/RandomValuePropertySourceTests.java
index eedec91d7b..9df913875c 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/env/RandomValuePropertySourceTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/env/RandomValuePropertySourceTests.java
@@ -123,7 +123,7 @@ class RandomValuePropertySourceTests {
 	}
 
 	@Test
-	void longRangeWhenLowerBoundNegativeShouldFailWithIllegalArgumentException() {
+	void longRangeWhenLowerBoundNegative() {
 		Long value = (Long) this.source.getProperty("random.long[-4,4]");
 		assertThat(value >= -4).isTrue();
 		assertThat(value < 4).isTrue();
diff --git a/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-secure-webflux/src/test/java/smoketest/secure/webflux/CorsSampleActuatorApplicationTests.java b/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-secure-webflux/src/test/java/smoketest/secure/webflux/CorsSampleActuatorApplicationTests.java
index cddc4b53e4..880413cd52 100644
--- a/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-secure-webflux/src/test/java/smoketest/secure/webflux/CorsSampleActuatorApplicationTests.java
+++ b/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-secure-webflux/src/test/java/smoketest/secure/webflux/CorsSampleActuatorApplicationTests.java
@@ -20,7 +20,6 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.context.ApplicationContext;
 import org.springframework.test.context.ActiveProfiles;
 import org.springframework.test.web.reactive.server.WebTestClient;
 
@@ -36,9 +35,6 @@ class CorsSampleActuatorApplicationTests {
 	@Autowired
 	private WebTestClient webClient;
 
-	@Autowired
-	private ApplicationContext applicationContext;
-
 	@Test
 	void endpointShouldReturnUnauthorized() {
 		this.webClient.get().uri("/actuator/env").exchange().expectStatus().isUnauthorized();