AJ-551: throw error when invalid hostname

Author: lucaijun

src/com/xxdb/SimpleDBConnectionPoolConfig.java

@@ -1,6 +1,5 @@
 package com.xxdb;
 
-import org.apache.commons.validator.routines.InetAddressValidator;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import sun.net.util.IPAddressUtil;