AJ-559: fix connection pool without userId or password

Author: lucaijun

src/com/xxdb/SimpleDBConnectionPool.java

@@ -100,6 +100,10 @@ protected class SimpleDBConnectionPoolImpl {
                     }
                     poolEntryArrayList.add(poolEntry);
                 }
+                if (userId.isEmpty() || password.isEmpty())
+                    log.warn("Create connection pool successfully without log in.");
+                else
+                    log.info("Create connection pool successfully with log in.");
                 poolEntries = new CopyOnWriteArrayList<>(poolEntryArrayList);
             } catch (Exception e) {
                 log.error("Create connection pool failure, because " + e.getMessage());