Check for null on the argument instead of the message

See gh-1307
Issue: SPR-15196

spring-context/src/main/java/org/springframework/cache/interceptor/AbstractCacheInvoker.java

@@ -37,7 +37,7 @@ public abstract class AbstractCacheInvoker {
 	}
 
 	protected AbstractCacheInvoker(CacheErrorHandler errorHandler) {
-		Assert.notNull("ErrorHandler must not be null");
+		Assert.notNull(errorHandler, "ErrorHandler must not be null");
 		this.errorHandler = errorHandler;
 	}
 

spring-jms/src/main/java/org/springframework/jms/core/JmsMessagingTemplate.java

@@ -73,7 +73,7 @@ public class JmsMessagingTemplate extends AbstractMessagingTemplate<Destination>
 	 * Create a {@code JmsMessagingTemplate} instance with the {@link JmsTemplate} to use.
 	 */
 	public JmsMessagingTemplate(JmsTemplate jmsTemplate) {
-		Assert.notNull("JmsTemplate must not be null");
+		Assert.notNull(jmsTemplate, "JmsTemplate must not be null");
 		this.jmsTemplate = jmsTemplate;
 	}
 

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/adapter/JettyWebSocketHandlerAdapter.java

@@ -62,8 +62,8 @@ public class JettyWebSocketHandlerAdapter {
 	public JettyWebSocketHandlerAdapter(WebSocketHandler handler,
 			Function<Session, JettyWebSocketSession> sessionFactory) {
 
-		Assert.notNull("WebSocketHandler is required");
-		Assert.notNull("'sessionFactory' is required");
+		Assert.notNull(handler, "WebSocketHandler is required");
+		Assert.notNull(sessionFactory, "'sessionFactory' is required");
 		this.delegateHandler = handler;
 		this.sessionFactory = sessionFactory;
 	}

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/adapter/StandardWebSocketHandlerAdapter.java

@@ -53,8 +53,8 @@ public class StandardWebSocketHandlerAdapter extends Endpoint {
 	public StandardWebSocketHandlerAdapter(WebSocketHandler handler,
 			Function<Session, StandardWebSocketSession> sessionFactory) {
 
-		Assert.notNull("WebSocketHandler is required");
-		Assert.notNull("'sessionFactory' is required");
+		Assert.notNull(handler, "WebSocketHandler is required");
+		Assert.notNull(sessionFactory, "'sessionFactory' is required");
 		this.delegateHandler = handler;
 		this.sessionFactory = sessionFactory;
 	}

spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/adapter/UndertowWebSocketHandlerAdapter.java

@@ -47,7 +47,7 @@ public class UndertowWebSocketHandlerAdapter extends AbstractReceiveListener {
 
 
 	public UndertowWebSocketHandlerAdapter(UndertowWebSocketSession session) {
-		Assert.notNull("UndertowWebSocketSession is required");
+		Assert.notNull(session, "UndertowWebSocketSession is required");
 		this.session = session;
 	}
 

spring-web/src/main/java/org/springframework/http/server/reactive/ReactorServerHttpRequest.java

@@ -55,7 +55,7 @@ public class ReactorServerHttpRequest extends AbstractServerHttpRequest {
 	}
 
 	private static URI initUri(HttpServerRequest channel) {
-		Assert.notNull("'channel' must not be null");
+		Assert.notNull(channel, "'channel' must not be null");
 		InetSocketAddress address = channel.remoteAddress();
 		return (address == null ? URI.create(channel.uri()) : getBaseUrl(address).resolve(channel.uri()));
 	}

spring-web/src/main/java/org/springframework/http/server/reactive/ReactorServerHttpResponse.java

@@ -50,7 +50,7 @@ public class ReactorServerHttpResponse extends AbstractServerHttpResponse
 
 	public ReactorServerHttpResponse(HttpServerResponse response, DataBufferFactory bufferFactory) {
 		super(bufferFactory);
-		Assert.notNull("'response' must not be null.");
+		Assert.notNull(response, "'response' must not be null.");
 		this.response = response;
 	}
 

spring-web/src/main/java/org/springframework/http/server/reactive/RxNettyServerHttpRequest.java

@@ -62,7 +62,7 @@ public class RxNettyServerHttpRequest extends AbstractServerHttpRequest {
 	}
 
 	private static URI initUri(HttpServerRequest<ByteBuf> request) {
-		Assert.notNull("'request', request must not be null");
+		Assert.notNull(request, "'request' must not be null");
 		return StringUtils.isEmpty(request.getHostHeader()) ?
 				URI.create(request.getUri()) : getBaseUrl(request).resolve(request.getUri());
 	}

spring-web/src/main/java/org/springframework/http/server/reactive/RxNettyServerHttpResponse.java

@@ -56,7 +56,7 @@ public class RxNettyServerHttpResponse extends AbstractServerHttpResponse {
 	public RxNettyServerHttpResponse(HttpServerResponse<ByteBuf> response,
 			NettyDataBufferFactory dataBufferFactory) {
 		super(dataBufferFactory);
-		Assert.notNull("'response', response must not be null.");
+		Assert.notNull(response, "'response' must not be null.");
 
 		this.response = response;
 	}