Add @FunctionalInterface on candidate interfaces

Issue: SPR-14432

spring-tx/src/main/java/org/springframework/dao/support/PersistenceExceptionTranslator.java

@@ -30,6 +30,7 @@ import org.springframework.dao.DataAccessException;
  * @author Juergen Hoeller
  * @since 2.0
  */
+@FunctionalInterface
 public interface PersistenceExceptionTranslator {
 
 	/**

spring-tx/src/main/java/org/springframework/jca/cci/core/ConnectionCallback.java

@@ -40,6 +40,7 @@ import org.springframework.dao.DataAccessException;
  * @see CciTemplate#execute(javax.resource.cci.InteractionSpec, javax.resource.cci.Record)
  * @see CciTemplate#execute(javax.resource.cci.InteractionSpec, RecordCreator, RecordExtractor)
  */
+@FunctionalInterface
 public interface ConnectionCallback<T> {
 
 	/**

spring-tx/src/main/java/org/springframework/jca/cci/core/InteractionCallback.java

@@ -41,6 +41,7 @@ import org.springframework.dao.DataAccessException;
  * @see CciTemplate#execute(javax.resource.cci.InteractionSpec, javax.resource.cci.Record)
  * @see CciTemplate#execute(javax.resource.cci.InteractionSpec, RecordCreator, RecordExtractor)
  */
+@FunctionalInterface
 public interface InteractionCallback<T> {
 
 	/**

spring-tx/src/main/java/org/springframework/jca/cci/core/RecordCreator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -45,6 +45,7 @@ import org.springframework.dao.DataAccessException;
  * @see CciTemplate#createMappedRecord(String)
  * @see CciTemplate#setOutputRecordCreator(RecordCreator)
  */
+@FunctionalInterface
 public interface RecordCreator {
 
 	/**

spring-tx/src/main/java/org/springframework/jca/cci/core/RecordExtractor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2016 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,6 +42,7 @@ import org.springframework.dao.DataAccessException;
  * @see CciTemplate#execute(javax.resource.cci.InteractionSpec, RecordCreator, RecordExtractor)
  * @see javax.resource.cci.ResultSet
  */
+@FunctionalInterface
 public interface RecordExtractor<T> {
 
 	/**

spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAspectSupport.java

@@ -630,6 +630,7 @@ public abstract class TransactionAspectSupport implements BeanFactoryAware, Init
 	 * Simple callback interface for proceeding with the target invocation.
 	 * Concrete interceptors/aspects adapt this to their invocation mechanism.
 	 */
+	@FunctionalInterface
 	protected interface InvocationCallback {
 
 		Object proceedWithInvocation() throws Throwable;

spring-tx/src/main/java/org/springframework/transaction/support/TransactionCallback.java

@@ -32,6 +32,7 @@ import org.springframework.transaction.TransactionStatus;
  * @see TransactionTemplate
  * @see CallbackPreferringPlatformTransactionManager
  */
+@FunctionalInterface
 public interface TransactionCallback<T> {
 
 	/**