User Problem

User Problem.java

List<Contact> cons = [
    SELECT Id, Name FROM Contact
    WHERE Role_Id__c != null
    AND Is_Active__c = true
    AND Email != null
];

List<User> users = [
    SELECT Id, ContactId FROM User WHERE ContactId IN :cons
];

Map<Id, User> usermap = new Map<Id, User>();
for (User usr : users) {
    usermap.put(usr.ContactId, usr);
}

for (Contact con : cons) {
    if (!usermap.containsKey(con.Id)) {
        System.debug(LoggingLevel.INFO, '*** con.Name: ' + con.Name);
        System.debug(LoggingLevel.INFO, '*** con.Id: ' + con.Id);
    }
}