Switch to JSpecify annotations

This commit updates the whole Spring Framework codebase to use JSpecify
annotations instead of Spring null-safety annotations with JSR 305
semantics.

JSpecify provides signficant enhancements such as properly defined
specifications, a canonical dependency with no split-package issue,
better tooling, better Kotlin integration and the capability to specify
generic type, array and varargs element null-safety. Generic type
null-safety is not defined by this commit yet and will be specified
later.

A key difference is that Spring null-safety annotations, following
JSR 305 semantics, apply to fields, parameters and return values,
while JSpecify annotations apply to type usages. That's why this
commit moves nullability annotations closer to the type for fields
and return values.

See gh-28797

spring-websocket/src/test/java/org/springframework/web/socket/AbstractWebSocketIntegrationTests.java

@@ -26,6 +26,7 @@ import java.util.stream.Stream;
 import jakarta.servlet.Filter;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.TestInfo;
 import org.junit.jupiter.params.ParameterizedTest;
@@ -33,7 +34,6 @@ import org.junit.jupiter.params.provider.Arguments;
 import org.junit.jupiter.params.provider.MethodSource;
 
 import org.springframework.context.Lifecycle;
-import org.springframework.lang.Nullable;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 import org.springframework.web.socket.client.WebSocketClient;
 import org.springframework.web.socket.client.standard.StandardWebSocketClient;

spring-websocket/src/test/java/org/springframework/web/socket/adapter/standard/ConvertingEncoderDecoderSupportTests.java

@@ -22,6 +22,7 @@ import jakarta.websocket.DecodeException;
 import jakarta.websocket.Decoder;
 import jakarta.websocket.EncodeException;
 import jakarta.websocket.Encoder;
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -34,7 +35,6 @@ import org.springframework.core.convert.ConverterNotFoundException;
 import org.springframework.core.convert.converter.Converter;
 import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.core.convert.support.GenericConversionService;
-import org.springframework.lang.Nullable;
 import org.springframework.web.context.WebApplicationContext;
 import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
 import org.springframework.web.socket.ContextLoaderTestUtils;

spring-websocket/src/test/java/org/springframework/web/socket/config/MessageBrokerBeanDefinitionParserTests.java

@@ -24,6 +24,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ScheduledThreadPoolExecutor;
 
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.DirectFieldAccessor;
@@ -32,7 +33,6 @@ import org.springframework.beans.factory.config.CustomScopeConfigurer;
 import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
 import org.springframework.core.MethodParameter;
 import org.springframework.core.io.ClassPathResource;
-import org.springframework.lang.Nullable;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHandler;
 import org.springframework.messaging.converter.ByteArrayMessageConverter;

spring-websocket/src/test/java/org/springframework/web/socket/messaging/OrderedMessageSendingIntegrationTests.java

@@ -28,11 +28,11 @@ import java.util.concurrent.atomic.AtomicReference;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
-import org.springframework.lang.Nullable;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHandler;
 import org.springframework.messaging.MessagingException;
@@ -214,8 +214,7 @@ class OrderedMessageSendingIntegrationTests {
 
 		private final WebSocketSession session;
 
-		@Nullable
-		private CountDownLatch messageLatch;
+		private @Nullable CountDownLatch messageLatch;
 
 		private final Queue<Message<?>> messages = new LinkedBlockingQueue<>();
 

spring-websocket/src/test/java/org/springframework/web/socket/messaging/WebSocketStompClientIntegrationTests.java

@@ -22,13 +22,13 @@ import java.util.List;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.TestInfo;
 
 import org.springframework.context.annotation.Configuration;
-import org.springframework.lang.Nullable;
 import org.springframework.messaging.converter.StringMessageConverter;
 import org.springframework.messaging.simp.config.MessageBrokerRegistry;
 import org.springframework.messaging.simp.stomp.StompCommand;

spring-websocket/src/test/java/org/springframework/web/socket/sockjs/client/RestTemplateXhrTransportTests.java

@@ -26,6 +26,7 @@ import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.LinkedBlockingDeque;
 
+import org.jspecify.annotations.Nullable;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.core.task.SyncTaskExecutor;
@@ -33,7 +34,6 @@ import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.client.ClientHttpResponse;
-import org.springframework.lang.Nullable;
 import org.springframework.messaging.Message;
 import org.springframework.messaging.MessageHeaders;
 import org.springframework.messaging.simp.stomp.StompCommand;

spring-websocket/src/test/java/org/springframework/web/socket/sockjs/client/TestTransport.java

@@ -23,10 +23,10 @@ import java.util.List;
 import java.util.concurrent.CompletableFuture;
 import java.util.function.BiConsumer;
 
+import org.jspecify.annotations.Nullable;
 import org.mockito.ArgumentCaptor;
 
 import org.springframework.http.HttpHeaders;
-import org.springframework.lang.Nullable;
 import org.springframework.web.socket.TextMessage;
 import org.springframework.web.socket.WebSocketHandler;
 import org.springframework.web.socket.WebSocketSession;
@@ -47,8 +47,7 @@ class TestTransport implements Transport {
 
 	private TransportRequest request;
 
-	@Nullable
-	private CompletableFuture<WebSocketSession> future;
+	private @Nullable CompletableFuture<WebSocketSession> future;
 
 
 	public TestTransport(String name) {