diff --git a/server/src/main/java/org/apache/kylin/rest/service/QueryService.java b/server/src/main/java/org/apache/kylin/rest/service/QueryService.java
index 059a095..4770a73 100644
--- a/server/src/main/java/org/apache/kylin/rest/service/QueryService.java
+++ b/server/src/main/java/org/apache/kylin/rest/service/QueryService.java
@@ -281,13 +281,14 @@ public class QueryService extends BasicService {
         if (StringUtils.isBlank(project)) {
             return Collections.emptyList();
         }
+        ResultSet JDBCTableMeta = null;
         try {
             DataSource dataSource = cacheService.getOLAPDataSource(project);
             conn = dataSource.getConnection();
             DatabaseMetaData metaData = conn.getMetaData();
 
             logger.debug("getting table metas");
-            ResultSet JDBCTableMeta = metaData.getTables(null, null, null, null);
+            JDBCTableMeta = metaData.getTables(null, null, null, null);
 
             tableMetas = new LinkedList<TableMeta>();
             Map<String, TableMeta> tableMap = new HashMap<String, TableMeta>();
@@ -321,6 +322,9 @@ public class QueryService extends BasicService {
             logger.debug("done column metas");
         } finally {
             close(columnMeta, null, conn);
+            if (JDBCTableMeta != null) {
+                JDBCTableMeta.close();
+            }
         }
 
         return tableMetas;