GUID UUID

• http://betterexplained.com/articles/the-quick-guide-to-guids/
• RFC 4122

In Java

• http://stackoverflow.com/questions/2982748/create-a-guid-in-java
• http://stackoverflow.com/questions/3388085/how-to-create-guid-in-java-ee

import java.util.UUID;

UUID uuid = UUID.randomUUID();

String randomUUIDString = uuid.toString();

Concerns

• Is it slow?