Java switch case throwing nullPointer Exception

I have an enum declared as follows -

public enum Status {
    REQ ("URL1"),
    NOT ("URL2"),
    GET ("URL3");

    String getURL;

    Status(String getURL) {
        this.getURL = getURL;

    }
}

And a field in my class:

private Status status;

I have a function in order to retrieve the URL based on the enum type as follows -

public String viewURL() {
    switch (status) {
        case REQ:
            return REQ.getURL;
        case NOT:
            return NOT.getURL;
        case GET:
            return GET.getURL;
    }
    return null;
}

I'm encountering a NullPointerException in this method when status is null.

However when I implement the same functionality using if-statements it works fine -

public String viewURL() {
    if (status == REQ) {
        return REQ.getURL;
    }
    if (status == NOT) {
        return NOT.getURL;
    }
    if (status == GET) {
        return GET.getURL;
    }
    return null;
}

Not able to understand where I'm going wrong. Any help would be really appreciated!

Any help on re-factoring also is appreciated!

This is an ideal use case for Optional:

public String viewURL() {
    return Optional.ofNullable(status)
      .map(s -> s.getUrl) // only executes if previous step returns non-null
      .orElse(null);      // executes if any step returns null
}

If the viewURL method has access to the status variable, you can use this code:

public String viewURL() {
    if (status != null)
        return status.getURL;
    return null;
}

I don't think you have to use a switch statement because we end up using the same code in every case. That is, we return status.getURL in every case.

The only requirement here is that every instance of the Status enum has a URL.