Actually I'm now seeing the same thing you are with this example. The error response is coming from Yahoo. The URL returns OK in a browser, but is getting an error return from Restlet (or a raw HttpClient call). I wonder if there are just some intermittent problems with this Yahoo API?
I'm using the org.restlet.example Eclipse module checked out from SVN. - Rob ----- Original Message ----- From: "Aadjan van der Helm" <[EMAIL PROTECTED]> To: [email protected] Sent: Friday, September 28, 2007 12:01:26 PM (GMT-0500) America/New_York Subject: Re: Trying to run book example2_1a Rob, Thanks for your response. I have the feeling some of the restlet functionality is really working for me now. But still some problems remain... I tried your suggestion and inserted the line like so: ... Response response = new Client(Protocol.HTTP).get(uri); DomRepresentation document = response.getEntityAsDom(); // Use XPath to find the interesting parts of the data structure response.getEntity().write(System.out); String expr = "/ResultSet/Result/Title"; for (Node node : document.getNodes(expr)) { System.out.println(node.getTextContent()); } ... To find that the xml response text has extraneous characters before and after (see below for the run log). o) What subsystem generates these characters? o) I find it strange that this apparently affects the value the variable document holds, because the earlier [Fatal Error] message is no longer there. An exception is still thrown at the same line as before though (For (Node node : document.getNodes(expr)) {). o) I also puzzled by the fact that the uri is reported invalid. Is the yahoo server telling me or is this a restlet request/client message? When I copy/paste the uri in my browser I get more text as a response. o) If possible, can you send me your eclipse project so I can try to have no problems ;-) Again, any help is appreciated. Kind regards, --Aadjan Run log (after inserting response.getEntity().write(System.out);): [Session started at 2007-09-28 17:14:26 +0200.] Sep 28, 2007 5:14:28 PM com.noelios.restlet.http.StreamClientHelper start INFO: Starting the HTTP client 151 <?xml version="1.0" encoding="UTF-8"?> <Error xmlns="urn:yahoo:api"> The following errors were detected: <Message>invalid value: uri - http://api.search.yahoo.com/WebSearchService/V1/webSearch?appid=restbook&query=bootsmade</Message> </Error> <!-- ws01.search.re2.yahoo.com uncompressed/chunked Fri Sep 28 08:14:32 PDT 2007 --> 0 Exception in thread "main" java.lang.NullPointerException at Example2_1b.main(Example2_1b.java:50) --------------- [end log] Rob Heittman wrote: > The XML parser in use is complaining about whitespace or characters > appearing before the <?xml version="1.0"?> statement. I just ran the > example on my OS X 10.4 machine and did not have trouble, though I'm > using Eclipse and not Xcode. > > Can you insert something like > > response.getEntity().write(System.out); > > to spot anything wrong with the XML you are getting from Yahoo (or > whatever server you are hitting, if you've changed the example to be > a client of something else?) > > - Rob > > > ----- Original Message ----- > From: "Aadjan van der Helm" <[EMAIL PROTECTED]> > To: [email protected] > Sent: Thursday, September 27, 2007 4:23:56 PM (GMT-0500) America/New_York > Subject: Trying to run book example2_1a > > Dear list, > > I'm evaluating the restlet framework to see if we can use it to create > clients for our restful image server. > > It's been a while since I was actively coding in java and it took a > while to get an xcode project (I'm on osx 10.4.10) into a shape to get > the book examples to compile and run. > > Now I've worked that out up to a point that eg. example 2_1a compiles > but generates a runtime error: > [Fatal Error] :1:1: Content is not allowed in prolog. > > It dies in the loop to iterate over the requested items in the document. > // Use XPath to find the interesting parts of the data structure > String expr = "/ResultSet/Result/Title"; > for (Node node : document.getNodes(expr)) { > System.out.println(node.getTextContent()); > } > > Any clues what is going wrong? > > Thanks in advance, > --Aadjan > > Run log: > [Session started at 2007-09-27 22:08:45 +0200.] > Sep 27, 2007 10:08:47 PM com.noelios.restlet.http.StreamClientHelper start > INFO: Starting the HTTP client > [Fatal Error] :1:1: Content is not allowed in prolog. > Exception in thread "main" java.lang.NullPointerException > at Example2_1a.main(Example2_1a.java:46) > > java has exited with status 1. > >
