Dear,
I want to make a timer on a WicketPage.
When my Wicket website starts at the begin page, it must redirect after 5
seconds to another.
I already have the following code:
=====================
public final class TimerTestPage extends WebPage {
Timer timer;
public TimerTestPage() {
super();
ActionListener actionListener;
actionListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
setResponsePage(DemoPage.class);
//getRequestCycle().setRequestTarget(DemoPage.class);
}
};
timer = new Timer(5000, actionListener);
timer.start();
}
}
=========================
The timer works, but after 5 seconds, the Wicket page is not redirected to
DemoPage.
It gives the following NullPointer exception:
===========================
Severe: Exception in thread "AWT-EventQueue-0"
Severe: java.lang.NullPointerException
at org.apache.wicket.Component.setResponsePage(Component.java:3141)
at
com.myapp.wicket.TimerTestPage$1.actionPerformed(TimerTestPage.java:30)
at javax.swing.Timer.fireActionPerformed(Timer.java:312)
at javax.swing.Timer$DoPostEvent.run(Timer.java:244)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:738)
at java.awt.EventQueue.access$300(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:699)
at java.awt.EventQueue$3.run(EventQueue.java:697)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:708)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
====================
Does anyone know what I am doing wrong? What exactly generates that
NullPointer exception?
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