Add blank line between java and javax imports

See gh-23539

spring-tx/src/test/java/org/springframework/dao/annotation/PersistenceExceptionTranslationAdvisorTests.java

@@ -20,6 +20,7 @@ import java.lang.annotation.ElementType;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
+
 import javax.persistence.PersistenceException;
 
 import org.junit.jupiter.api.Test;

spring-tx/src/test/java/org/springframework/jca/cci/CciTemplateTests.java

@@ -17,6 +17,7 @@
 package org.springframework.jca.cci;
 
 import java.sql.SQLException;
+
 import javax.resource.NotSupportedException;
 import javax.resource.ResourceException;
 import javax.resource.cci.Connection;

spring-tx/src/test/java/org/springframework/transaction/annotation/AnnotationTransactionAttributeSourceTests.java

@@ -21,6 +21,7 @@ import java.io.Serializable;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.lang.reflect.Method;
+
 import javax.ejb.TransactionAttributeType;
 
 import groovy.lang.GroovyObject;

spring-tx/src/test/java/org/springframework/transaction/annotation/AnnotationTransactionNamespaceHandlerTests.java

@@ -19,6 +19,7 @@ package org.springframework.transaction.annotation;
 import java.lang.management.ManagementFactory;
 import java.util.Collection;
 import java.util.Map;
+
 import javax.management.MBeanServer;
 import javax.management.ObjectName;
 

spring-tx/src/test/java/org/springframework/transaction/jta/MockUOWManager.java

@@ -20,6 +20,7 @@ import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
+
 import javax.transaction.Synchronization;
 
 import com.ibm.wsspi.uow.UOWAction;