Code to check if users are already exists in OIM

public void userexists(String UserID){
HashMap userMap = new HashMap);
try{
userMap.put("Users.User ID",UserID);
tcResultSet resultSet=moUserUtility.findUsers(userMap);
if(resultSet.getRowCount()==0)
{
fL.writeToLog("User is not present");
System.out.println(UserID+ "is not present in OIM");
}
else
{
fL.writeToLog("User '"+UserID+"'is present");
System.out.println("User '"+UserID+"'is present in OIM");
}

}
catch(Exception e){

}
}