Generating a random unique number in a SOAP UI request

In the request use,

${=System.currentTimeMillis() + ((int)(Math.random()*10000))}

example :  

Note : Here I am generating this number by adding currant milliseconds as a prefix. So this will generate almost unique number.


Update: 20th June 2014. 

Another simple way to do this. 

${=java.util.UUID.randomUUID()}