Take a look at line 217 of your SignIn class and see why it throws a NPE.
Martijn
On Wed, May 18, 2011 at 3:24 PM, hubert_hupe <hubert_h...@gmx.de> wrote:
> hi sven,
>
> here it is. cheers hubert
>
> WicketMessage: Can't instantiate page using constructor public
> com.reporting.SignIn(org.apache.wicket.PageParameters) and argument
>
> Root cause:
>
> java.lang.NullPointerException
> at com.reporting.SignIn.<init>(SignIn.java:217)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at
> org.apache.wicket.session.DefaultPageFactory.createPage(DefaultPageFactory.java:188)
> at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:65)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:298)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java:320)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:234)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at
> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:319)
> at
> org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1089)
> at
> org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:365)
> at
> org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
> at
> org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
> at
> org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
> at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
> at
> org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
> at org.mortbay.jetty.Server.handle(Server.java:295)
> at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:503)
> at
> org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:827)
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:511)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:210)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:379)
> at
> org.mortbay.jetty.bio.SocketConnector$Connection.run(SocketConnector.java:226)
> at
> org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
>
> Complete stack:
>
> org.apache.wicket.WicketRuntimeException: Can't instantiate page using
> constructor public com.reporting.SignIn(org.apache.wicket.PageParameters) and
> argument
> at
> org.apache.wicket.session.DefaultPageFactory.createPage(DefaultPageFactory.java:212)
> at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:65)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:298)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java:320)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:234)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at
> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
>
> java.lang.reflect.InvocationTargetException
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
> at
> org.apache.wicket.session.DefaultPageFactory.createPage(DefaultPageFactory.java:188)
> at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:65)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:298)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java:320)
> at
> org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:234)
> at
> org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:92)
> at
> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1250)
> at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
> at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1436)
> at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
> at
> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:486)
>
>
> Am 18.05.2011 um 14:59 schrieb Sven Meier:
>
>> Hi,
>>
>> > error: WicketMessage: Can't instantiate page using constructor
>> > public com.test.Test(org.apache.wicket.PageParameters) and argument
>>
>> an exception stacktrace would give us a clue on what goes wrong here.
>>
>> Sven
>>
>> Am 18.05.2011 11:44, schrieb hubert_hupe:
>>> hello,
>>>
>>> after hours of researching and trying get a simple tree running iam
>>> completely frustrated.
>>>
>>> i added a tree to the website in this way:
>>>
>>> public class Test extends WebPage {
>>>
>>> protected TreeModel createTreeModel() {
>>> List<Object> l1 = new ArrayList<Object>();
>>> l1.add("test 1.1");
>>> ....
>>> }
>>>
>>> public Test(final PageParameters parameters) {
>>> tree = new LinkTree("tree", createTreeModel());
>>> add(tree);
>>> }
>>> markup:
>>>
>>> <div wicket:id="tree" class="my-tree"> </div>
>>>
>>> now the problem: i am not able to fetch the selected node. iam not able to
>>> fetch the event...
>>> i tried the following:
>>>
>>> add(new LinkTree("tree") {
>>> public void onClick(AjaxRequestTarget target) {
>>> System.out.println("Click");
>>> }
>>> });
>>> error: WicketMessage: Can't instantiate page using constructor public
>>> com.test.Test(org.apache.wicket.PageParameters) and argument
>>>
>>> what works is: to get an event from a link:
>>>
>>> add(new AjaxLink("expandAll") {
>>> @Override
>>> public void onClick(AjaxRequestTarget target) {
>>> tree.getTreeState().expandAll();
>>> tree.updateTree(target);
>>> System.out.println("Click");
>>> }
>>> });
>>>
>>> the same must be possible with the tree?!
>>>
>>> any help is appreciated...
>>>
>>> cheers hubert
>>>
>>>
>>>
>>>
>>
>>
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>
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