How should I resolve java.lang.IllegalArgumentException: protocol = https host = null Exception?

Question

I am working on a SSL client server program and I have to reuse the following method.

private boolean postMessage(String message){
    try{ 
         String serverURLS = getRecipientURL(message);

         serverURLS = "https:\\\\abc.my.domain.com:55555\\update";

         if (serverURLS != null){
             serverURL = new URL(serverURLS);
         }

        HttpsURLConnection conn = (HttpsURLConnection)serverURL.openConnection();

        conn.setHostnameVerifier(new HostnameVerifier() { 
        public boolean verify(String arg0, SSLSession arg1) {
            return true;
        } 
        });

        conn.setDoOutput(true);

        OutputStream os = conn.getOutputStream();

        OutputStreamWriter wr = new OutputStreamWriter(os);

        wr.write(message);

        wr.flush();

        if (conn.getResponseCode() != HttpsURLConnection.HTTP_OK)
            return false;
        else
            return true;

    }

Here ServerURL is initialized as

private URL serverURL = null;

When I try to execute this method I get an exception at Line,

OutputStream os = conn.getOutputStream();

The exception is

java.lang.IllegalArgumentException: protocol = https host = null

What is the reason for this?

Aaron Digulla · Accepted Answer · 2009-04-27 12:48:41Z

19

URLs use forward slashes (/), not backward ones (as windows). Try:

serverURLS = "https://abc.my.domain.com:55555/update";

The reason why you get the error is that the URL class can't parse the host part of the string and therefore, host is null.

edited Apr 27, 2009 at 12:48

answered Apr 27, 2009 at 12:23

Aaron Digulla

330k111 gold badges626 silver badges840 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

matt b · Accepted Answer · 2009-04-27 12:59:51Z

3

This code seems completely unnecessary:

String serverURLS = getRecipientURL(message);

serverURLS = "https:\\\\abc.my.domain.com:55555\\update";

if (serverURLS != null){
    serverURL = new URL(serverURLS);
}

serverURLS is assigned the result of getRecipientURL(message)
Then immediately you overwrite the value of serverURLS, making the previous statement a dead store
Then, because if (serverURLS != null) evaluates to true, since you just assigned the variable a value in the preceding statement, you assign a value to serverURL. It is impossible for if (serverURLS != null) to evaluate to false!
You never actually use the variable serverURLS beyond the previous line of code.

You could replace all of this with just:

serverURL = new URL("https:\\\\abc.my.domain.com:55555\\update");

answered Apr 27, 2009 at 12:59

matt b

140k66 gold badges287 silver badges352 bronze badges

1 Comment

Chathuranga Chandrasekara Over a year ago

Hi, That line is added by me just to check the reason for the error. Actually the URL is filtered using the message. Note that the assignment of ServerURLs is a Test line :)

Satish M · Accepted Answer · 2020-09-27 08:21:42Z

0

Might help some else - I came here because I missed putting two // after http:. This is what I had:

http:/abc.my.domain.com:55555/update

answered Sep 27, 2020 at 8:21

Satish M

415 bronze badges

Collectives™ on Stack Overflow

How should I resolve java.lang.IllegalArgumentException: protocol = https host = null Exception?

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related