Add whitespace after copyright header

Add an additional lines after the copyright header and before the
`package` declaration. This aligns with the style used by Spring
Framework.

Issue gh-8945

messaging/src/main/java/org/springframework/security/messaging/access/expression/DefaultMessageSecurityExpressionHandler.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import org.springframework.messaging.Message;

messaging/src/main/java/org/springframework/security/messaging/access/expression/EvaluationContextPostProcessor.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import org.springframework.expression.EvaluationContext;

messaging/src/main/java/org/springframework/security/messaging/access/expression/ExpressionBasedMessageSecurityMetadataSourceFactory.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import java.util.Arrays;

messaging/src/main/java/org/springframework/security/messaging/access/expression/MessageExpressionConfigAttribute.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import java.util.Map;

messaging/src/main/java/org/springframework/security/messaging/access/expression/MessageExpressionVoter.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import java.util.Collection;

messaging/src/main/java/org/springframework/security/messaging/access/expression/MessageSecurityExpressionRoot.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import org.springframework.messaging.Message;

messaging/src/main/java/org/springframework/security/messaging/access/intercept/ChannelSecurityInterceptor.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.intercept;
 
 import org.springframework.messaging.Message;

messaging/src/main/java/org/springframework/security/messaging/access/intercept/DefaultMessageSecurityMetadataSource.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.intercept;
 
 import java.util.Collection;

messaging/src/main/java/org/springframework/security/messaging/access/intercept/MessageSecurityMetadataSource.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.intercept;
 
 import org.springframework.messaging.Message;

messaging/src/main/java/org/springframework/security/messaging/context/AuthenticationPrincipalArgumentResolver.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.context;
 
 import java.lang.annotation.Annotation;

messaging/src/main/java/org/springframework/security/messaging/context/SecurityContextChannelInterceptor.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.context;
 
 import java.util.Stack;

messaging/src/main/java/org/springframework/security/messaging/util/matcher/AbstractMessageMatcherComposite.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import java.util.Arrays;

messaging/src/main/java/org/springframework/security/messaging/util/matcher/AndMessageMatcher.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import java.util.List;

messaging/src/main/java/org/springframework/security/messaging/util/matcher/MessageMatcher.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import org.springframework.messaging.Message;

messaging/src/main/java/org/springframework/security/messaging/util/matcher/OrMessageMatcher.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import java.util.List;

messaging/src/main/java/org/springframework/security/messaging/util/matcher/SimpDestinationMessageMatcher.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import java.util.Collections;

messaging/src/main/java/org/springframework/security/messaging/util/matcher/SimpMessageTypeMatcher.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import org.springframework.messaging.Message;

messaging/src/main/java/org/springframework/security/messaging/web/csrf/CsrfChannelInterceptor.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.web.csrf;
 
 import java.util.Map;

messaging/src/main/java/org/springframework/security/messaging/web/socket/server/CsrfTokenHandshakeInterceptor.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.web.socket.server;
 
 import java.util.Map;

messaging/src/test/java/org/springframework/security/messaging/access/expression/DefaultMessageSecurityExpressionHandlerTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import org.junit.Before;

messaging/src/test/java/org/springframework/security/messaging/access/expression/ExpressionBasedMessageSecurityMetadataSourceFactoryTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import java.util.Collection;

messaging/src/test/java/org/springframework/security/messaging/access/expression/MessageExpressionConfigAttributeTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import org.junit.Before;

messaging/src/test/java/org/springframework/security/messaging/access/expression/MessageExpressionVoterTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.expression;
 
 import java.util.Arrays;

messaging/src/test/java/org/springframework/security/messaging/access/intercept/ChannelSecurityInterceptorTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.intercept;
 
 import java.util.Arrays;

messaging/src/test/java/org/springframework/security/messaging/access/intercept/DefaultMessageSecurityMetadataSourceTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.access.intercept;
 
 import java.util.Arrays;

messaging/src/test/java/org/springframework/security/messaging/context/AuthenticationPrincipalArgumentResolverTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.context;
 
 import java.lang.annotation.ElementType;

messaging/src/test/java/org/springframework/security/messaging/context/SecurityContextChannelInterceptorTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.context;
 
 import java.security.Principal;

messaging/src/test/java/org/springframework/security/messaging/util/matcher/AndMessageMatcherTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import java.util.Arrays;

messaging/src/test/java/org/springframework/security/messaging/util/matcher/OrMessageMatcherTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import java.util.Arrays;

messaging/src/test/java/org/springframework/security/messaging/util/matcher/SimpDestinationMessageMatcherTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import org.junit.Before;

messaging/src/test/java/org/springframework/security/messaging/util/matcher/SimpMessageTypeMatcherTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.util.matcher;
 
 import org.junit.Before;

messaging/src/test/java/org/springframework/security/messaging/web/csrf/CsrfChannelInterceptorTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.web.csrf;
 
 import java.util.HashMap;

messaging/src/test/java/org/springframework/security/messaging/web/socket/server/CsrfTokenHandshakeInterceptorTests.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package org.springframework.security.messaging.web.socket.server;
 
 import java.util.HashMap;