Polish

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/transaction/jta/JtaAutoConfigurationTests.java

@@ -32,6 +32,7 @@ import javax.naming.InitialContext;
 import javax.naming.NamingException;
 import javax.sql.DataSource;
 import javax.sql.XADataSource;
+import javax.transaction.TransactionManager;
 import javax.transaction.UserTransaction;
 import javax.transaction.xa.XAResource;