Add blank line between java and javax imports

See gh-23539

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/ConvertingEncoderDecoderSupport.java

@@ -17,6 +17,7 @@
 package org.springframework.web.socket.adapter.standard;
 
 import java.nio.ByteBuffer;
+
 import javax.websocket.DecodeException;
 import javax.websocket.Decoder;
 import javax.websocket.EncodeException;

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/StandardToWebSocketExtensionAdapter.java

@@ -19,6 +19,7 @@ package org.springframework.web.socket.adapter.standard;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
+
 import javax.websocket.Extension;
 
 import org.springframework.util.LinkedCaseInsensitiveMap;

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

@@ -17,6 +17,7 @@
 package org.springframework.web.socket.adapter.standard;
 
 import java.nio.ByteBuffer;
+
 import javax.websocket.CloseReason;
 import javax.websocket.Endpoint;
 import javax.websocket.EndpointConfig;

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/StandardWebSocketSession.java

@@ -24,6 +24,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+
 import javax.websocket.CloseReason;
 import javax.websocket.CloseReason.CloseCodes;
 import javax.websocket.Extension;

spring-websocket/src/main/java/org/springframework/web/socket/adapter/standard/WebSocketToStandardExtensionAdapter.java

@@ -18,6 +18,7 @@ package org.springframework.web.socket.adapter.standard;
 
 import java.util.ArrayList;
 import java.util.List;
+
 import javax.websocket.Extension;
 
 import org.springframework.web.socket.WebSocketExtension;

spring-websocket/src/main/java/org/springframework/web/socket/client/standard/EndpointConnectionManager.java

@@ -18,6 +18,7 @@ package org.springframework.web.socket.client.standard;
 
 import java.util.Arrays;
 import java.util.List;
+
 import javax.websocket.ClientEndpointConfig;
 import javax.websocket.ClientEndpointConfig.Configurator;
 import javax.websocket.ContainerProvider;

spring-websocket/src/main/java/org/springframework/web/socket/client/standard/StandardWebSocketClient.java

@@ -26,6 +26,7 @@ import java.util.List;
 import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.Callable;
+
 import javax.websocket.ClientEndpointConfig;
 import javax.websocket.ClientEndpointConfig.Configurator;
 import javax.websocket.ContainerProvider;

spring-websocket/src/main/java/org/springframework/web/socket/server/jetty/JettyRequestUpgradeStrategy.java

@@ -23,6 +23,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+
 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/AbstractStandardUpgradeStrategy.java

@@ -21,6 +21,7 @@ import java.security.Principal;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+
 import javax.servlet.ServletContext;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/AbstractTyrusRequestUpgradeStrategy.java

@@ -24,6 +24,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Random;
+
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/GlassFishRequestUpgradeStrategy.java

@@ -18,6 +18,7 @@ package org.springframework.web.socket.server.standard;
 
 import java.io.IOException;
 import java.lang.reflect.Constructor;
+
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/ServerEndpointExporter.java

@@ -21,6 +21,7 @@ import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+
 import javax.servlet.ServletContext;
 import javax.websocket.DeploymentException;
 import javax.websocket.server.ServerContainer;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/ServerEndpointRegistration.java

@@ -20,6 +20,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+
 import javax.websocket.Decoder;
 import javax.websocket.Encoder;
 import javax.websocket.Endpoint;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/SpringConfigurator.java

@@ -19,6 +19,7 @@ package org.springframework.web.socket.server.standard;
 import java.util.Arrays;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+
 import javax.websocket.server.ServerEndpoint;
 import javax.websocket.server.ServerEndpointConfig.Configurator;
 

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/TomcatRequestUpgradeStrategy.java

@@ -20,6 +20,7 @@ import java.io.IOException;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/UndertowRequestUpgradeStrategy.java

@@ -20,6 +20,7 @@ import java.io.IOException;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/WebLogicRequestUpgradeStrategy.java

@@ -19,6 +19,7 @@ package org.springframework.web.socket.server.standard;
 import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
+
 import javax.servlet.AsyncContext;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;

spring-websocket/src/main/java/org/springframework/web/socket/server/standard/WebSphereRequestUpgradeStrategy.java

@@ -20,6 +20,7 @@ import java.lang.reflect.Method;
 import java.util.Collections;
 import java.util.List;
 import java.util.Map;
+
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.websocket.Endpoint;

spring-websocket/src/main/java/org/springframework/web/socket/server/support/HttpSessionHandshakeInterceptor.java

@@ -20,6 +20,7 @@ import java.util.Collection;
 import java.util.Collections;
 import java.util.Enumeration;
 import java.util.Map;
+
 import javax.servlet.http.HttpSession;
 
 import org.springframework.http.server.ServerHttpRequest;

spring-websocket/src/main/java/org/springframework/web/socket/server/support/WebSocketHttpRequestHandler.java

@@ -21,6 +21,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/support/AbstractSockJsService.java

@@ -28,6 +28,7 @@ import java.util.List;
 import java.util.Random;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
+
 import javax.servlet.http.HttpServletRequest;
 
 import org.apache.commons.logging.Log;

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/support/SockJsHttpRequestHandler.java

@@ -17,6 +17,7 @@
 package org.springframework.web.socket.sockjs.support;
 
 import java.io.IOException;
+
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/DefaultSockJsService.java

@@ -20,6 +20,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.LinkedHashSet;
 import java.util.Set;
+
 import javax.servlet.ServletContext;
 
 import org.apache.commons.logging.Log;

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/handler/WebSocketTransportHandler.java

@@ -17,6 +17,7 @@
 package org.springframework.web.socket.sockjs.transport.handler;
 
 import java.util.Map;
+
 import javax.servlet.ServletContext;
 
 import org.springframework.context.Lifecycle;

spring-websocket/src/main/java/org/springframework/web/socket/sockjs/transport/session/AbstractHttpSockJsSession.java

@@ -25,6 +25,7 @@ import java.util.List;
 import java.util.Map;
 import java.util.Queue;
 import java.util.concurrent.LinkedBlockingQueue;
+
 import javax.servlet.ServletRequest;
 
 import org.springframework.http.HttpHeaders;