Simple question.. how to call a java class method in Groovy Script

[RJ]

Here is my script. Highlighted the method call.. tried some google searches
for the syntax. Thanks for the help!

import java.util.*
import com.example.auth.user;

class EBSAttrRelease {
    def Map<UserString, List<UserObject>> run(final UserObject... args) {
    def userid=com.example.auth.user.getId()
    return [MYLOGINID:userid]
    }
}

Error:
2017-05-22 13:32:56,986 ERROR - <groovy.lang.MissingMethodException: No
signature of method: static com.example.auth.user.getId() is applicable for
argument types: () values: []
Possible solutions: getAt(java.lang.String), wait(), find(), grep(),
wait(long), grep(java.lang.Object)>