This is pretty simple snippet to get API Token of a user , lets say "MYUser" in jenkins.  
its pretty useful when you are working with 'jenkins-job-builder' to update jobs in jenkins, 
and you need to get the api token which JJB needs inorder to update jobs to ..  
run this code in either jenkins script console , or as i prefer, in form of init.groovy.  
so when jenkins master starts, i create a user for JJb.  
after that i get the token right away and pass it to my JJB jobs folder to file 'jenkins_jobs.ini' :)_  .  

```groovy

///////////////////////////////////////////////////////////////////////
import jenkins.security.*
//j.jenkins.setSecurityRealm(j.createDummySecurityRealm());        
User u = User.get("Myuser")  
ApiTokenProperty t = u.getProperty(ApiTokenProperty.class)  
def token = t.getApiToken()
//token.getClass()
println "token is $token "
////////////////////////////////////////////////////////////////////////

```