Integrate animal sniffer

Animal sniffer provides tools to assist verifying that classes
compiled with a newer JDK are compatible with an older JDK.

This integratesthe latest version of the tool (1.11) that
permits the use of custom annotations. Added @UsesJava7,
@UsesJava8 and @UsesSunHttpServer and annotated the few places
where we rely on a specific environment.

The verification process can be invoked by running the 'sniff'
task.

Issue: SPR-11604

polishing

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

@@ -22,6 +22,7 @@ import javax.sql.rowset.CachedRowSet;
 import javax.sql.rowset.RowSetFactory;
 import javax.sql.rowset.RowSetProvider;
 
+import org.springframework.core.UsesJava7;
 import org.springframework.core.JdkVersion;
 import org.springframework.jdbc.support.rowset.ResultSetWrappingSqlRowSet;
 import org.springframework.jdbc.support.rowset.SqlRowSet;
@@ -109,6 +110,7 @@ public class SqlRowSetResultSetExtractor implements ResultSetExtractor<SqlRowSet
 	/**
 	 * Inner class to avoid a hard dependency on JDBC 4.1 RowSetProvider class.
 	 */
+	@UsesJava7
 	private static class StandardCachedRowSetFactory implements CachedRowSetFactory {
 
 		private final RowSetFactory rowSetFactory;

spring-jdbc/src/main/java/org/springframework/jdbc/support/JdbcUtils.java

@@ -34,6 +34,7 @@ import javax.sql.DataSource;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import org.springframework.core.UsesJava7;
 import org.springframework.jdbc.CannotGetJdbcConnectionException;
 import org.springframework.jdbc.datasource.DataSourceUtils;
 import org.springframework.util.ClassUtils;
@@ -134,6 +135,7 @@ public abstract class JdbcUtils {
 	 * @return the value object
 	 * @throws SQLException if thrown by the JDBC API
 	 */
+	@UsesJava7 // guard use of JDBC 4.1 (safe with 1.6)
 	public static Object getResultSetValue(ResultSet rs, int index, Class<?> requiredType) throws SQLException {
 		if (requiredType == null) {
 			return getResultSetValue(rs, index);