String(Join,Split)

String[] address = req.getParameterValues("memberAddress");
		
if(!address[0].equals("")) {
	inputMember.setMemberAddress(String.join(",,", address));
} else {
	inputMember.setMemberAddress(null);
}

logger.debug(inputMember.getMemberAddress());
String[] add = inputMember.getMemberAddress().split(",,");
logger.debug(add[0]);
logger.debug(add[1]);
logger.debug(add[2]);