Add @FunctionalInterface on candidate interfaces

Issue: SPR-14432

spring-jdbc/src/main/java/org/springframework/jdbc/core/CallableStatementCallback.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.
@@ -40,6 +40,7 @@ import org.springframework.dao.DataAccessException;
  * @see JdbcTemplate#execute(String, CallableStatementCallback)
  * @see JdbcTemplate#execute(CallableStatementCreator, CallableStatementCallback)
  */
+@FunctionalInterface
 public interface CallableStatementCallback<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/CallableStatementCreator.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.
@@ -40,6 +40,7 @@ import java.sql.SQLException;
  * @see JdbcTemplate#call
  * @see SqlProvider
  */
+@FunctionalInterface
 public interface CallableStatementCreator {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/ConnectionCallback.java

@@ -37,6 +37,7 @@ import org.springframework.dao.DataAccessException;
  * @see JdbcTemplate#query
  * @see JdbcTemplate#update
  */
+@FunctionalInterface
 public interface ConnectionCallback<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/ParameterMapper.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.
@@ -30,6 +30,7 @@ import java.util.Map;
  * @see CallableStatementCreatorFactory#newCallableStatementCreator(ParameterMapper)
  * @see org.springframework.jdbc.object.StoredProcedure#execute(ParameterMapper)
  */
+@FunctionalInterface
 public interface ParameterMapper {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/ParameterizedPreparedStatementSetter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 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.
@@ -37,6 +37,7 @@ import java.sql.SQLException;
  * @since 3.1
  * @see JdbcTemplate#batchUpdate(String, java.util.Collection, int, ParameterizedPreparedStatementSetter)
  */
+@FunctionalInterface
 public interface ParameterizedPreparedStatementSetter<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/PreparedStatementCallback.java

@@ -40,6 +40,7 @@ import org.springframework.dao.DataAccessException;
  * @see JdbcTemplate#execute(String, PreparedStatementCallback)
  * @see JdbcTemplate#execute(PreparedStatementCreator, PreparedStatementCallback)
  */
+@FunctionalInterface
 public interface PreparedStatementCallback<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/PreparedStatementCreator.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.
@@ -40,6 +40,7 @@ import java.sql.SQLException;
  * @see JdbcTemplate#update(PreparedStatementCreator)
  * @see SqlProvider
  */
+@FunctionalInterface
 public interface PreparedStatementCreator {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/PreparedStatementSetter.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.
@@ -40,6 +40,7 @@ import java.sql.SQLException;
  * @see JdbcTemplate#update(String, PreparedStatementSetter)
  * @see JdbcTemplate#query(String, PreparedStatementSetter, ResultSetExtractor)
  */
+@FunctionalInterface
 public interface PreparedStatementSetter {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/ResultSetExtractor.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.
@@ -46,6 +46,7 @@ import org.springframework.dao.DataAccessException;
  * @see RowMapper
  * @see org.springframework.jdbc.core.support.AbstractLobStreamingResultSetExtractor
  */
+@FunctionalInterface
 public interface ResultSetExtractor<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/RowCallbackHandler.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 java.sql.SQLException;
  * @see ResultSetExtractor
  * @see RowCountCallbackHandler
  */
+@FunctionalInterface
 public interface RowCallbackHandler {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/RowMapper.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 java.sql.SQLException;
  * @see ResultSetExtractor
  * @see org.springframework.jdbc.object.MappingSqlQuery
  */
+@FunctionalInterface
 public interface RowMapper<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/core/StatementCallback.java

@@ -33,6 +33,7 @@ import org.springframework.dao.DataAccessException;
  * @since 16.03.2004
  * @see JdbcTemplate#execute(StatementCallback)
  */
+@FunctionalInterface
 public interface StatementCallback<T> {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/init/DatabasePopulator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 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.
@@ -29,6 +29,7 @@ import java.sql.SQLException;
  * @see DatabasePopulatorUtils
  * @see DataSourceInitializer
  */
+@FunctionalInterface
 public interface DatabasePopulator {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/datasource/lookup/DataSourceLookup.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.
@@ -29,6 +29,7 @@ import javax.sql.DataSource;
  * @since 2.0
  * @see org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager#setDataSourceLookup
  */
+@FunctionalInterface
 public interface DataSourceLookup {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/support/DatabaseMetaDataCallback.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.
@@ -28,6 +28,7 @@ import java.sql.SQLException;
  * @author Thomas Risberg
  * @see JdbcUtils#extractDatabaseMetaData
  */
+@FunctionalInterface
 public interface DatabaseMetaDataCallback {
 
 	/**

spring-jdbc/src/main/java/org/springframework/jdbc/support/SQLExceptionTranslator.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.
@@ -33,6 +33,7 @@ import org.springframework.dao.DataAccessException;
  * @author Juergen Hoeller
  * @see org.springframework.dao.DataAccessException
  */
+@FunctionalInterface
 public interface SQLExceptionTranslator {
 
 	/**