add debug logs in error cases

Author: vandonr

dd-java-agent/instrumentation/jdbc/src/main/java/datadog/trace/instrumentation/jdbc/JDBCDecorator.java

@@ -218,13 +218,15 @@ public static DBInfo parseDBInfoFromConnection(final Connection connection) {
             clientInfo = connection.getClientInfo();
           } catch (final Throwable ex) {
             // getClientInfo is likely not allowed, we can still extract info from the url alone
+            log.debug("Could not get client info from DB", ex);
           }
         }
         dbInfo = JDBCConnectionUrlParser.extractDBInfo(url, clientInfo);
       } else {
         dbInfo = DBInfo.DEFAULT;
       }
     } catch (final SQLException se) {
+      log.debug("Could not get metadata from DB", se);
       dbInfo = DBInfo.DEFAULT;
     }
     return dbInfo;