There was a response from Maxim from OpenMeetings team, but users@wicket.apache.org was not in CC:
<copy> Hello Martin, I have modified the code and have removed AjaxDownloader (since it is not really necessary). NullPointerException somehow happens while post parameters parsing (getCallbackURL) is not working anymore. I believe this is somehow connected with custom HomePageMapper https://svn.apache.org/viewvc/incubator/openmeetings/trunk/singlewebapp/src/org/apache/openmeetings/web/app/Application.java?revision=1384647&view=markup line 62 and below. Maybe you can help me with this? I have added HomePageMapper to implement "single page application" and remove all URL parameters automaticatilly being added by Wicket. Thanks in advance </copy> Hi Maxim, The NullPointerException is while Wicket tries to read the POST parameters. The request mappers manipulate only the GET parameters, so I think it is not related. I've just checked Jetty 7.6.3 sources and they return String[0] so it should be OK in this particular version of Jetty. But I'll add the check anyway with https://issues.apache.org/jira/browse/WICKET-4818 On Wed, Oct 17, 2012 at 9:16 AM, Martin Grigorov <mgrigo...@apache.org> wrote: > Hi, > > On Tue, Oct 16, 2012 at 7:59 PM, seba.wag...@gmail.com > <seba.wag...@gmail.com> wrote: >> Hi, >> >> I did follow this tutorial to create a download via Ajax in a form: >> https://cwiki.apache.org/confluence/display/WICKET/AJAX+update+and+file+download+in+one+blow >> >> The slightly modified code can be seen here: >> https://svn.apache.org/viewvc/incubator/openmeetings/trunk/singlewebapp/src/org/apache/openmeetings/web/components/admin/backup/BackupPanel.java?view=markup >> Line 127 "download.initialize(target);" is called. > > It seems you have modified BackupPanel. There is no code like > "download.initialize(target)" > >> >> The rest seems to me similar to the example, except for that I set the File >> is set dynamically with every Ajax request. >> >> The File itself does exist and is created correctly. >> >> However Wicket throws this wired exception: >> http://pastebin.com/raw.php?i=Fijqjd5y > > NullPointerException is not something one should expect so it is a bug. > According to > https://github.com/apache/wicket/blob/build/wicket-6.0.0/wicket-core/src/main/java/org/apache/wicket/protocol/http/servlet/ServletWebRequest.java#L321 > its cause is that HttpServletRequest.getParametersMap() returns a Map > with an entry with value == null. I'm not sure in what cases this can > happen but I'll add a check for null there. > >> >> The trace seems to be an internal Wicket error. Is this a Bug inside Wicket? >> >> Sebastian >> -- >> Sebastian Wagner >> https://twitter.com/#!/dead_lock >> http://www.webbase-design.de >> http://www.wagner-sebastian.com >> seba.wag...@gmail.com > > > > -- > Martin Grigorov > jWeekend > Training, Consulting, Development > http://jWeekend.com -- Martin Grigorov jWeekend Training, Consulting, Development http://jWeekend.com --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
