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java.lang.IllegalArgumentException: host parameter is null

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java.lang.IllegalArgumentException: host parameter is null

Abel MacAdam
Hi,

After a few fruitless days struggling with JSSE, I finally found Commons-HTTPClient. I'm trying out the example TrivialApp you can download from the examples directory. And that example gives me an IllegalArgumentException headache.

The code looks like:
    static String username = "";
    static String password = "";
    static String theUrl   = "localhost";
    static Logger logger;

    private static final void printUsage(String text)
    {
    logger.info(text);
    System.out.println (text);
    }

   public static void main(String[] args)
    {
    logger = Logger.getLogger(TrivialApp.class);
   
        Credentials creds = null;
        creds = new UsernamePasswordCredentials(username, password);

        //create a singular HttpClient object
        HttpClient client = new HttpClient();

        //establish a connection within 5 seconds
        client.getHttpConnectionManager().
            getParams().setConnectionTimeout(5000);

        //set the default credentials
        if (creds != null) {
            client.getState().setCredentials(AuthScope.ANY, creds);
        }

        String url = theUrl;
        HttpMethod method = null;

        //create a method object
        method = new GetMethod(url);
        method.setFollowRedirects(true);

        //execute the method
        String responseBody = null;
        try{
            client.executeMethod(method);
            responseBody = method.getResponseBodyAsString();
        } catch (HttpException he) {
            printUsage("Http error connecting to '" + url + "'");
            printUsage(he.getMessage());
            System.exit(-4);
        } catch (IOException ioe){
        printUsage("Unable to connect to '" + url + "'");
            System.exit(-3);
        }

        //write out the request headers
        printUsage("*** Request ***");
        printUsage("Request Path: " + method.getPath());
        printUsage("Request Query: " + method.getQueryString());
        Header[] requestHeaders = method.getRequestHeaders();
        for (int i=0; i<requestHeaders.length; i++){
            System.out.print(requestHeaders[i]);
        }

        //write out the response headers
        printUsage("*** Response ***");
        printUsage("Status Line: " + method.getStatusLine());
        Header[] responseHeaders = method.getResponseHeaders();
        for (int i=0; i<responseHeaders.length; i++){
            System.out.print(responseHeaders[i]);
        }

        //write out the response body
        System.out.println("*** Response Body ***");
        System.out.println(responseBody);

        //clean up the connection resources
        method.releaseConnection();

        System.exit(0);
    }

The stack trace I got for the Exception is:
Exception in thread "main" java.lang.IllegalArgumentException: host parameter is null
        at org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:206)
        at org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:155)
        at org.apache.commons.httpclient.SimpleHttpConnectionManager.getConnectionWithTimeout(SimpleHttpConnectionManager.java:175)
        at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:153)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
        at TrivialApp.main(TrivialApp.java:107)

Long introduction. Concluding: Am I wrong in assuming the assignment
    theURL = "localhost";
is wrong?

It is a real head scratcher. If you could point out where this goes wrong, I would be obliged.

TIA,
Abel
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Re: java.lang.IllegalArgumentException: host parameter is null

Abel MacAdam
Sorry, theUrl should be "http://localhost". :-[
AbelMacAdam wrote
Hi,

After a few fruitless days struggling with JSSE, I finally found Commons-HTTPClient. I'm trying out the example TrivialApp you can download from the examples directory. And that example gives me an IllegalArgumentException headache.

The code looks like:
    static String username = "";
    static String password = "";
    static String theUrl   = "localhost";
    static Logger logger;

    private static final void printUsage(String text)
    {
    logger.info(text);
    System.out.println (text);
    }

   public static void main(String[] args)
    {
    logger = Logger.getLogger(TrivialApp.class);
   
        Credentials creds = null;
        creds = new UsernamePasswordCredentials(username, password);

        //create a singular HttpClient object
        HttpClient client = new HttpClient();

        //establish a connection within 5 seconds
        client.getHttpConnectionManager().
            getParams().setConnectionTimeout(5000);

        //set the default credentials
        if (creds != null) {
            client.getState().setCredentials(AuthScope.ANY, creds);
        }

        String url = theUrl;
        HttpMethod method = null;

        //create a method object
        method = new GetMethod(url);
        method.setFollowRedirects(true);

        //execute the method
        String responseBody = null;
        try{
            client.executeMethod(method);
            responseBody = method.getResponseBodyAsString();
        } catch (HttpException he) {
            printUsage("Http error connecting to '" + url + "'");
            printUsage(he.getMessage());
            System.exit(-4);
        } catch (IOException ioe){
        printUsage("Unable to connect to '" + url + "'");
            System.exit(-3);
        }

        //write out the request headers
        printUsage("*** Request ***");
        printUsage("Request Path: " + method.getPath());
        printUsage("Request Query: " + method.getQueryString());
        Header[] requestHeaders = method.getRequestHeaders();
        for (int i=0; i<requestHeaders.length; i++){
            System.out.print(requestHeaders[i]);
        }

        //write out the response headers
        printUsage("*** Response ***");
        printUsage("Status Line: " + method.getStatusLine());
        Header[] responseHeaders = method.getResponseHeaders();
        for (int i=0; i<responseHeaders.length; i++){
            System.out.print(responseHeaders[i]);
        }

        //write out the response body
        System.out.println("*** Response Body ***");
        System.out.println(responseBody);

        //clean up the connection resources
        method.releaseConnection();

        System.exit(0);
    }

The stack trace I got for the Exception is:
Exception in thread "main" java.lang.IllegalArgumentException: host parameter is null
        at org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:206)
        at org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:155)
        at org.apache.commons.httpclient.SimpleHttpConnectionManager.getConnectionWithTimeout(SimpleHttpConnectionManager.java:175)
        at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:153)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
        at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
        at TrivialApp.main(TrivialApp.java:107)

Long introduction. Concluding: Am I wrong in assuming the assignment
    theURL = "localhost";
is wrong?

It is a real head scratcher. If you could point out where this goes wrong, I would be obliged.

TIA,
Abel
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Re: java.lang.IllegalArgumentException: host parameter is null

sebb-2-2
Just guessing, but try:

http://localhost/

On 23/01/2008, AbelMacAdam <[hidden email]> wrote:

>
> Sorry, theUrl should be "http://localhost". :-[
>
> AbelMacAdam wrote:
> >
> > Hi,
> >
> > After a few fruitless days struggling with JSSE, I finally found
> > Commons-HTTPClient. I'm trying out the example TrivialApp you can download
> > from the examples directory. And that example gives me an
> > IllegalArgumentException headache.
> >
> > The code looks like:
> >     static String username = "";
> >     static String password = "";
> >     static String theUrl   = "localhost";
> >     static Logger logger;
> >
> >     private static final void printUsage(String text)
> >     {
> >       logger.info(text);
> >       System.out.println (text);
> >     }
> >
> >    public static void main(String[] args)
> >     {
> >       logger = Logger.getLogger(TrivialApp.class);
> >
> >         Credentials creds = null;
> >         creds = new UsernamePasswordCredentials(username, password);
> >
> >         //create a singular HttpClient object
> >         HttpClient client = new HttpClient();
> >
> >         //establish a connection within 5 seconds
> >         client.getHttpConnectionManager().
> >             getParams().setConnectionTimeout(5000);
> >
> >         //set the default credentials
> >         if (creds != null) {
> >             client.getState().setCredentials(AuthScope.ANY, creds);
> >         }
> >
> >         String url = theUrl;
> >         HttpMethod method = null;
> >
> >         //create a method object
> >         method = new GetMethod(url);
> >         method.setFollowRedirects(true);
> >
> >         //execute the method
> >         String responseBody = null;
> >         try{
> >             client.executeMethod(method);
> >             responseBody = method.getResponseBodyAsString();
> >         } catch (HttpException he) {
> >             printUsage("Http error connecting to '" + url + "'");
> >             printUsage(he.getMessage());
> >             System.exit(-4);
> >         } catch (IOException ioe){
> >               printUsage("Unable to connect to '" + url + "'");
> >             System.exit(-3);
> >         }
> >
> >         //write out the request headers
> >         printUsage("*** Request ***");
> >         printUsage("Request Path: " + method.getPath());
> >         printUsage("Request Query: " + method.getQueryString());
> >         Header[] requestHeaders = method.getRequestHeaders();
> >         for (int i=0; i<requestHeaders.length; i++){
> >             System.out.print(requestHeaders[i]);
> >         }
> >
> >         //write out the response headers
> >         printUsage("*** Response ***");
> >         printUsage("Status Line: " + method.getStatusLine());
> >         Header[] responseHeaders = method.getResponseHeaders();
> >         for (int i=0; i<responseHeaders.length; i++){
> >             System.out.print(responseHeaders[i]);
> >         }
> >
> >         //write out the response body
> >         System.out.println("*** Response Body ***");
> >         System.out.println(responseBody);
> >
> >         //clean up the connection resources
> >         method.releaseConnection();
> >
> >         System.exit(0);
> >     }
> >
> > The stack trace I got for the Exception is:
> > Exception in thread "main" java.lang.IllegalArgumentException: host
> > parameter is null
> >       at
> > org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:206)
> >       at
> > org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:155)
> >       at
> > org.apache.commons.httpclient.SimpleHttpConnectionManager.getConnectionWithTimeout(SimpleHttpConnectionManager.java:175)
> >       at
> > org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:153)
> >       at
> > org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
> >       at
> > org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
> >       at TrivialApp.main(TrivialApp.java:107)
> >
> > Long introduction. Concluding: Am I wrong in assuming the assignment
> >     theURL = "localhost";
> > is wrong?
> >
> > It is a real head scratcher. If you could point out where this goes wrong,
> > I would be obliged.
> >
> > TIA,
> > Abel
> >
>
> --
> View this message in context: http://www.nabble.com/java.lang.IllegalArgumentException%3A-host-parameter-is-null-tp15040749p15041125.html
> Sent from the HttpClient-User mailing list archive at Nabble.com.
>
>
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