Polishing

framework-docs/modules/ROOT/pages/web/websocket/stomp/enable.adoc

@@ -3,7 +3,7 @@
 
 STOMP over WebSocket support is available in the `spring-messaging` and
 `spring-websocket` modules. Once you have those dependencies, you can expose a STOMP
-endpoints, over WebSocket with xref:web/websocket/fallback.adoc[SockJS Fallback], as the following example shows:
+endpoint over WebSocket with xref:web/websocket/fallback.adoc[SockJS Fallback], as the following example shows:
 
 [source,java,indent=0,subs="verbatim,quotes"]
 ----
@@ -32,7 +32,7 @@ client needs to connect for the WebSocket handshake.
 <2> STOMP messages whose destination header begins with `/app` are routed to
 `@MessageMapping` methods in `@Controller` classes.
 <3> Use the built-in message broker for subscriptions and broadcasting and
-route messages whose destination header begins with `/topic `or `/queue` to the broker.
+route messages whose destination header begins with `/topic` or `/queue` to the broker.
 
 
 The following example shows the XML configuration equivalent of the preceding example:

spring-core/src/main/java/org/springframework/aot/hint/MemberCategory.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -22,7 +22,7 @@ import java.lang.reflect.Member;
 import java.lang.reflect.Method;
 
 /**
- * Represent predefined {@linkplain Member members} groups.
+ * Predefined {@link Member} categories.
  *
  * @author Andy Clement
  * @author Sebastien Deleuze
@@ -39,14 +39,14 @@ public enum MemberCategory {
 
 	/**
 	 * A category that represents {@linkplain Class#getDeclaredFields() declared
-	 * fields}, that is all fields defined by the class, but not inherited ones.
+	 * fields}: all fields defined by the class but not inherited fields.
 	 * @see Class#getDeclaredFields()
 	 */
 	DECLARED_FIELDS,
 
 	/**
 	 * A category that defines public {@linkplain Constructor constructors} can
-	 * be introspected, but not invoked.
+	 * be introspected but not invoked.
 	 * @see Class#getConstructors()
 	 * @see ExecutableMode#INTROSPECT
 	 */
@@ -54,7 +54,7 @@ public enum MemberCategory {
 
 	/**
 	 * A category that defines {@linkplain Class#getDeclaredConstructors() all
-	 * constructors} can be introspected, but not invoked.
+	 * constructors} can be introspected but not invoked.
 	 * @see Class#getDeclaredConstructors()
 	 * @see ExecutableMode#INTROSPECT
 	 */
@@ -78,7 +78,7 @@ public enum MemberCategory {
 
 	/**
 	 * A category that defines public {@linkplain Method methods}, including
-	 * inherited ones can be introspect, but not invoked.
+	 * inherited ones, can be introspected but not invoked.
 	 * @see Class#getMethods()
 	 * @see ExecutableMode#INTROSPECT
 	 */
@@ -86,7 +86,7 @@ public enum MemberCategory {
 
 	/**
 	 * A category that defines {@linkplain Class#getDeclaredMethods() all
-	 * methods}, excluding inherited ones can be introspected, but not invoked.
+	 * methods}, excluding inherited ones, can be introspected but not invoked.
 	 * @see Class#getDeclaredMethods()
 	 * @see ExecutableMode#INTROSPECT
 	 */
@@ -94,7 +94,7 @@ public enum MemberCategory {
 
 	/**
 	 * A category that defines public {@linkplain Method methods}, including
-	 * inherited ones can be invoked.
+	 * inherited ones, can be invoked.
 	 * @see Class#getMethods()
 	 * @see ExecutableMode#INVOKE
 	 */
@@ -102,7 +102,7 @@ public enum MemberCategory {
 
 	/**
 	 * A category that defines {@linkplain Class#getDeclaredMethods() all
-	 * methods}, excluding inherited ones can be invoked.
+	 * methods}, excluding inherited ones, can be invoked.
 	 * @see Class#getDeclaredMethods()
 	 * @see ExecutableMode#INVOKE
 	 */
@@ -110,16 +110,18 @@ public enum MemberCategory {
 
 	/**
 	 * A category that represents public {@linkplain Class#getClasses() inner
-	 * classes}. Contrary to other categories, this does not register any
-	 * particular reflection for them but rather make sure they are available
+	 * classes}.
+	 * <p>Contrary to other categories, this does not register any particular
+	 * reflection for inner classes but rather makes sure they are available
 	 * via a call to {@link Class#getClasses}.
 	 */
 	PUBLIC_CLASSES,
 
 	/**
 	 * A category that represents all {@linkplain Class#getDeclaredClasses()
-	 * inner classes}. Contrary to other categories, this does not register any
-	 * particular reflection for them but rather make sure they are available
+	 * inner classes}.
+	 * <p>Contrary to other categories, this does not register any particular
+	 * reflection for inner classes but rather makes sure they are available
 	 * via a call to {@link Class#getDeclaredClasses}.
 	 */
 	DECLARED_CLASSES;

spring-core/src/main/java/org/springframework/core/NativeDetector.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,15 +33,16 @@ public abstract class NativeDetector {
 	private static final boolean inNativeImage = (imageCode != null);
 
 	/**
-	 * Returns {@code true} if running in a native image context (for example {@code buildtime}, {@code runtime} or
-	 * {@code agent}) expressed by setting {@code org.graalvm.nativeimage.imagecode} system property to any value, else {@code false}.
+	 * Returns {@code true} if running in a native image context (for example
+	 * {@code buildtime}, {@code runtime}, or {@code agent}) expressed by setting the
+	 * {@code org.graalvm.nativeimage.imagecode} system property to any value.
 	 */
 	public static boolean inNativeImage() {
 		return inNativeImage;
 	}
 
 	/**
-	 * Returns {@code true} if running in any of the specified native image context(s), else {@code false}.
+	 * Returns {@code true} if running in any of the specified native image context(s).
 	 * @param contexts the native image context(s)
 	 * @since 6.0.10
 	 */
@@ -55,8 +56,8 @@ public abstract class NativeDetector {
 	}
 
 	/**
-	 * Native image context as defined in
-	 * <a href="https://github.com/oracle/graal/blob/master/sdk/src/org.graalvm.nativeimage/src/org/graalvm/nativeimage/ImageInfo.java">ImageInfo.java</a>.
+	 * Native image context as defined in GraalVM's
+	 * <a href="https://github.com/oracle/graal/blob/master/sdk/src/org.graalvm.nativeimage/src/org/graalvm/nativeimage/ImageInfo.java">ImageInfo</a>.
 	 *
 	 * @since 6.0.10
 	 */
@@ -82,6 +83,7 @@ public abstract class NativeDetector {
 		public String toString() {
 			return this.key;
 		}
+
 	}
 
 }

spring-messaging/src/test/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistryTests.java

@@ -16,7 +16,6 @@
 
 package org.springframework.messaging.simp.broker;
 
-import java.util.Arrays;
 import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
@@ -33,41 +32,38 @@ import org.springframework.util.MultiValueMap;
 import static org.assertj.core.api.Assertions.assertThat;
 
 /**
- * Test fixture for
- * {@link org.springframework.messaging.simp.broker.DefaultSubscriptionRegistry}.
+ * Tests for {@link DefaultSubscriptionRegistry}.
  *
  * @author Rossen Stoyanchev
  * @author Sebastien Deleuze
+ * @author Sam Brannen
  */
-public class DefaultSubscriptionRegistryTests {
+class DefaultSubscriptionRegistryTests {
 
 	private final DefaultSubscriptionRegistry registry = new DefaultSubscriptionRegistry();
 
 
 	@Test
-	public void registerSubscriptionInvalidInput() {
+	void registerSubscriptionInvalidInput() {
 		String sessId = "sess01";
 		String subsId = "subs01";
 		String dest = "/foo";
 
 		this.registry.registerSubscription(subscribeMessage(null, subsId, dest));
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
 		assertThat(actual).isEmpty();
 
 		this.registry.registerSubscription(subscribeMessage(sessId, null, dest));
 		actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
 		assertThat(actual).isEmpty();
 
 		this.registry.registerSubscription(subscribeMessage(sessId, subsId, null));
 		actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
 		assertThat(actual).isEmpty();
 	}
 
 	@Test
-	public void registerSubscription() {
+	void registerSubscription() {
 		String sessId = "sess01";
 		String subsId = "subs01";
 		String dest = "/foo";
@@ -75,15 +71,14 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.registerSubscription(subscribeMessage(sessId, subsId, dest));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected one element " + actual).hasSize(1);
-		assertThat(actual.get(sessId)).isEqualTo(Collections.singletonList(subsId));
+		assertThat(actual).hasSize(1);
+		assertThat(actual.get(sessId)).containsExactly(subsId);
 	}
 
 	@Test
-	public void registerSubscriptionOneSession() {
+	void registerSubscriptionOneSession() {
 		String sessId = "sess01";
-		List<String> subscriptionIds = Arrays.asList("subs01", "subs02", "subs03");
+		List<String> subscriptionIds = List.of("subs01", "subs02", "subs03");
 		String dest = "/foo";
 
 		for (String subId : subscriptionIds) {
@@ -91,13 +86,12 @@ public class DefaultSubscriptionRegistryTests {
 		}
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
 		assertThat(sort(actual.get(sessId))).isEqualTo(subscriptionIds);
 	}
 
 	@Test
-	public void registerSameSubscriptionTwice() {
+	void registerSameSubscriptionTwice() {
 		String sessId = "sess01";
 		String subId = "subs01";
 		String dest = "/foo";
@@ -106,15 +100,14 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.registerSubscription(subscribeMessage(sessId, subId, dest));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
 		assertThat(actual.get(sessId)).containsExactly(subId);
 	}
 
 	@Test
-	public void registerSubscriptionMultipleSessions() {
-		List<String> sessIds = Arrays.asList("sess01", "sess02", "sess03");
-		List<String> subscriptionIds = Arrays.asList("subs01", "subs02", "subs03");
+	void registerSubscriptionMultipleSessions() {
+		List<String> sessIds = List.of("sess01", "sess02", "sess03");
+		List<String> subscriptionIds = List.of("subs01", "subs02", "subs03");
 		String dest = "/foo";
 
 		for (String sessId : sessIds) {
@@ -124,7 +117,6 @@ public class DefaultSubscriptionRegistryTests {
 		}
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(3);
 		assertThat(sort(actual.get(sessIds.get(0)))).isEqualTo(subscriptionIds);
 		assertThat(sort(actual.get(sessIds.get(1)))).isEqualTo(subscriptionIds);
@@ -132,7 +124,7 @@ public class DefaultSubscriptionRegistryTests {
 	}
 
 	@Test
-	public void registerSubscriptionWithDestinationPattern() {
+	void registerSubscriptionWithDestinationPattern() {
 		String sessId = "sess01";
 		String subsId = "subs01";
 		String destPattern = "/topic/PRICE.STOCK.*.IBM";
@@ -140,13 +132,12 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.registerSubscription(subscribeMessage(sessId, subsId, destPattern));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected one element " + actual).hasSize(1);
-		assertThat(actual.get(sessId)).isEqualTo(Collections.singletonList(subsId));
+		assertThat(actual).hasSize(1);
+		assertThat(actual.get(sessId)).containsExactly(subsId);
 	}
 
 	@Test  // SPR-11657
-	public void registerSubscriptionsWithSimpleAndPatternDestinations() {
+	void registerSubscriptionsWithSimpleAndPatternDestinations() {
 		String sess1 = "sess01";
 		String sess2 = "sess02";
 
@@ -161,7 +152,6 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.registerSubscription(subscribeMessage(sess1, subs1, "/topic/PRICE.STOCK.*.IBM"));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
 		assertThat(actual.get(sess1)).containsExactlyInAnyOrder(subs2, subs1);
 
@@ -170,51 +160,45 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.registerSubscription(subscribeMessage(sess2, subs3, "/topic/PRICE.STOCK.NASDAQ.GOOG"));
 
 		actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(2);
 		assertThat(actual.get(sess1)).containsExactlyInAnyOrder(subs2, subs1);
-		assertThat(actual.get(sess2)).isEqualTo(Collections.singletonList(subs1));
+		assertThat(actual.get(sess2)).containsExactly(subs1);
 
 		this.registry.unregisterAllSubscriptions(sess1);
 
 		actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
-		assertThat(actual.get(sess2)).isEqualTo(Collections.singletonList(subs1));
+		assertThat(actual.get(sess2)).containsExactly(subs1);
 
 		this.registry.registerSubscription(subscribeMessage(sess1, subs1, "/topic/PRICE.STOCK.*.IBM"));
 		this.registry.registerSubscription(subscribeMessage(sess1, subs2, destNasdaqIbm));
 
 		actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(2);
 		assertThat(actual.get(sess1)).containsExactlyInAnyOrder(subs1, subs2);
-		assertThat(actual.get(sess2)).isEqualTo(Collections.singletonList(subs1));
+		assertThat(actual.get(sess2)).containsExactly(subs1);
 
 		this.registry.unregisterSubscription(unsubscribeMessage(sess1, subs2));
 
 		actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(2);
-		assertThat(actual.get(sess1)).isEqualTo(Collections.singletonList(subs1));
-		assertThat(actual.get(sess2)).isEqualTo(Collections.singletonList(subs1));
+		assertThat(actual.get(sess1)).containsExactly(subs1);
+		assertThat(actual.get(sess2)).containsExactly(subs1);
 
 		this.registry.unregisterSubscription(unsubscribeMessage(sess1, subs1));
 
 		actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
-		assertThat(actual.get(sess2)).isEqualTo(Collections.singletonList(subs1));
+		assertThat(actual.get(sess2)).containsExactly(subs1);
 
 		this.registry.unregisterSubscription(unsubscribeMessage(sess2, subs1));
 
 		actual = this.registry.findSubscriptions(destNasdaqIbmMessage);
-		assertThat(actual).isNotNull();
 		assertThat(actual).isEmpty();
 	}
 
 	@Test  // SPR-11755
-	public void registerAndUnregisterMultipleDestinations() {
+	void registerAndUnregisterMultipleDestinations() {
 		String sess1 = "sess01";
 		String sess2 = "sess02";
 
@@ -247,7 +231,7 @@ public class DefaultSubscriptionRegistryTests {
 	}
 
 	@Test
-	public void registerSubscriptionWithDestinationPatternRegex() {
+	void registerSubscriptionWithDestinationPatternRegex() {
 		String sessId = "sess01";
 		String subsId = "subs01";
 		String destPattern = "/topic/PRICE.STOCK.*.{ticker:(IBM|MSFT)}";
@@ -255,24 +239,21 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.registerSubscription(subscribeMessage(sessId, subsId, destPattern));
 		Message<?> message = createMessage("/topic/PRICE.STOCK.NASDAQ.IBM");
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(message);
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected one element " + actual).hasSize(1);
-		assertThat(actual.get(sessId)).isEqualTo(Collections.singletonList(subsId));
+		assertThat(actual).hasSize(1);
+		assertThat(actual.get(sessId)).containsExactly(subsId);
 
 		message = createMessage("/topic/PRICE.STOCK.NASDAQ.MSFT");
 		actual = this.registry.findSubscriptions(message);
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected one element " + actual).hasSize(1);
-		assertThat(actual.get(sessId)).isEqualTo(Collections.singletonList(subsId));
+		assertThat(actual).hasSize(1);
+		assertThat(actual.get(sessId)).containsExactly(subsId);
 
 		message = createMessage("/topic/PRICE.STOCK.NASDAQ.VMW");
 		actual = this.registry.findSubscriptions(message);
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected no elements " + actual).isEmpty();
+		assertThat(actual).isEmpty();
 	}
 
 	@Test
-	public void registerSubscriptionWithSelector() {
+	void registerSubscriptionWithSelector() {
 		String sessionId = "sess01";
 		String subscriptionId = "subs01";
 		String destination = "/foo";
@@ -288,19 +269,17 @@ public class DefaultSubscriptionRegistryTests {
 		Message<?> message = MessageBuilder.createMessage("", accessor.getMessageHeaders());
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(message);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
-		assertThat(actual.get(sessionId)).isEqualTo(Collections.singletonList(subscriptionId));
+		assertThat(actual.get(sessionId)).containsExactly(subscriptionId);
 
-		// Then without
+		// Then without selector header
 
 		actual = this.registry.findSubscriptions(createMessage(destination));
-		assertThat(actual).isNotNull();
 		assertThat(actual).isEmpty();
 	}
 
 	@Test
-	public void registerSubscriptionWithSelectorNotSupported() {
+	void registerSubscriptionWithSelectorNotSupported() {
 		String sessionId = "sess01";
 		String subscriptionId = "subs01";
 		String destination = "/foo";
@@ -315,39 +294,35 @@ public class DefaultSubscriptionRegistryTests {
 		Message<?> message = MessageBuilder.createMessage("", accessor.getMessageHeaders());
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(message);
-		assertThat(actual).isNotNull();
 		assertThat(actual).hasSize(1);
-		assertThat(actual.get(sessionId)).isEqualTo(Collections.singletonList(subscriptionId));
+		assertThat(actual.get(sessionId)).containsExactly(subscriptionId);
 	}
 
 	@Test  // SPR-11931
-	public void registerSubscriptionTwiceAndUnregister() {
+	void registerSubscriptionTwiceAndUnregister() {
 		this.registry.registerSubscription(subscribeMessage("sess01", "subs01", "/foo"));
 		this.registry.registerSubscription(subscribeMessage("sess01", "subs02", "/foo"));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage("/foo"));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected 1 element").hasSize(1);
-		assertThat(actual.get("sess01")).isEqualTo(Arrays.asList("subs01", "subs02"));
+		assertThat(actual).hasSize(1);
+		assertThat(actual.get("sess01")).containsExactly("subs01", "subs02");
 
 		this.registry.unregisterSubscription(unsubscribeMessage("sess01", "subs01"));
 
 		actual = this.registry.findSubscriptions(createMessage("/foo"));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected 1 element").hasSize(1);
-		assertThat(actual.get("sess01")).isEqualTo(Collections.singletonList("subs02"));
+		assertThat(actual).hasSize(1);
+		assertThat(actual.get("sess01")).containsExactly("subs02");
 
 		this.registry.unregisterSubscription(unsubscribeMessage("sess01", "subs02"));
 
 		actual = this.registry.findSubscriptions(createMessage("/foo"));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected no element").isEmpty();
+		assertThat(actual).isEmpty();
 	}
 
 	@Test
-	public void unregisterSubscription() {
-		List<String> sessIds = Arrays.asList("sess01", "sess02", "sess03");
-		List<String> subscriptionIds = Arrays.asList("subs01", "subs02", "subs03");
+	void unregisterSubscription() {
+		List<String> sessIds = List.of("sess01", "sess02", "sess03");
+		List<String> subscriptionIds = List.of("subs01", "subs02", "subs03");
 		String dest = "/foo";
 
 		for (String sessId : sessIds) {
@@ -361,16 +336,15 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.unregisterSubscription(unsubscribeMessage(sessIds.get(0), subscriptionIds.get(2)));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected two elements: " + actual).hasSize(2);
+		assertThat(actual).hasSize(2);
 		assertThat(sort(actual.get(sessIds.get(1)))).isEqualTo(subscriptionIds);
 		assertThat(sort(actual.get(sessIds.get(2)))).isEqualTo(subscriptionIds);
 	}
 
 	@Test
-	public void unregisterAllSubscriptions() {
-		List<String> sessIds = Arrays.asList("sess01", "sess02", "sess03");
-		List<String> subscriptionIds = Arrays.asList("subs01", "subs02", "subs03");
+	void unregisterAllSubscriptions() {
+		List<String> sessIds = List.of("sess01", "sess02", "sess03");
+		List<String> subscriptionIds = List.of("subs01", "subs02", "subs03");
 		String dest = "/foo";
 
 		for (String sessId : sessIds) {
@@ -383,31 +357,28 @@ public class DefaultSubscriptionRegistryTests {
 		this.registry.unregisterAllSubscriptions(sessIds.get(1));
 
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage(dest));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected one element: " + actual).hasSize(1);
+		assertThat(actual).hasSize(1);
 		assertThat(sort(actual.get(sessIds.get(2)))).isEqualTo(subscriptionIds);
 	}
 
 	@Test
-	public void unregisterAllSubscriptionsNoMatch() {
+	void unregisterAllSubscriptionsNoMatch() {
 		this.registry.unregisterAllSubscriptions("bogus");
 		// no exceptions
 	}
 
 	@Test
-	public void findSubscriptionsNoMatches() {
+	void findSubscriptionsNoMatches() {
 		MultiValueMap<String, String> actual = this.registry.findSubscriptions(createMessage("/foo"));
-		assertThat(actual).isNotNull();
-		assertThat(actual).as("Expected no elements " + actual).isEmpty();
+		assertThat(actual).isEmpty();
 	}
 
 	@Test  // SPR-12665
-	public void findSubscriptionsReturnsMapSafeToIterate() throws Exception {
+	void findSubscriptionsReturnsMapSafeToIterate() throws Exception {
 		this.registry.registerSubscription(subscribeMessage("sess1", "1", "/foo"));
 		this.registry.registerSubscription(subscribeMessage("sess2", "1", "/foo"));
 
 		MultiValueMap<String, String> subscriptions = this.registry.findSubscriptions(createMessage("/foo"));
-		assertThat(subscriptions).isNotNull();
 		assertThat(subscriptions).hasSize(2);
 
 		Iterator<Map.Entry<String, List<String>>> iterator = subscriptions.entrySet().iterator();
@@ -420,12 +391,11 @@ public class DefaultSubscriptionRegistryTests {
 	}
 
 	@Test  // SPR-13185
-	public void findSubscriptionsReturnsMapSafeToIterateIncludingValues() throws Exception {
+	void findSubscriptionsReturnsMapSafeToIterateIncludingValues() throws Exception {
 		this.registry.registerSubscription(subscribeMessage("sess1", "1", "/foo"));
 		this.registry.registerSubscription(subscribeMessage("sess1", "2", "/foo"));
 
 		MultiValueMap<String, String> allSubscriptions = this.registry.findSubscriptions(createMessage("/foo"));
-		assertThat(allSubscriptions).isNotNull();
 		assertThat(allSubscriptions).hasSize(1);
 
 		Iterator<String> iteratorValues = allSubscriptions.get("sess1").iterator();
@@ -438,7 +408,7 @@ public class DefaultSubscriptionRegistryTests {
 	}
 
 	@Test // SPR-13555
-	public void cacheLimitExceeded() throws Exception {
+	void cacheLimitExceeded() throws Exception {
 		this.registry.setCacheLimit(1);
 		this.registry.registerSubscription(subscribeMessage("sess1", "1", "/foo"));
 		this.registry.registerSubscription(subscribeMessage("sess1", "2", "/bar"));