I'm trying to apply the concepts found here:
http://cwiki.apache.org/confluence/display/WICKET/Calling+Wicket+from+Javascript
. The code for my very simple test case is below. When I load the page, I
expect to see "hi" printed to my console. Instead I get a
NullPointerException (also shown below). What am I doing wrong?
public class AjaxTestPage extends WebPage implements IHeaderContributor {
final AbstractDefaultAjaxBehavior behave = new
AbstractDefaultAjaxBehavior() {
@Override
protected void respond(AjaxRequestTarget target) {
System.out.println("hi");
}
};
public AjaxTestPage() {
add(behave);
}
@Override
public void renderHead(IHeaderResponse response) {
response.renderOnLoadJavascript(
" wicketAjaxGet('" + behave.getCallbackUrl() +
"', function() { },
function() { }); "
);
}
}
java.lang.NullPointerException
at com.insom.ErrorPage.<init>(ErrorPage.java:19)
at
com.insom.MyWebRequestCycle.onRuntimeException(MyWebRequestCycle.java:24)
at
org.apache.wicket.request.AbstractRequestCycleProcessor.onRuntimeException(AbstractRequestCycleProcessor.java:217)
at
org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:119)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1302)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1353)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:497)
at
org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:387)
at
org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:124)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
--
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