NPE on invoking JFrames with tray within AssertJSwingJUnitTestCase

[angeloBerlin]

Running the test results in an NPE. Doing the same without extending AssertJSwingJUnitTestCase works fine.

import java.awt.AWTException;
import java.awt.Image;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;

import javax.swing.JFrame;

public class TrayFrame extends JFrame {

	public TrayFrame() {

		setSize(200, 100);

		if (SystemTray.isSupported()) {

			SystemTray tray = SystemTray.getSystemTray();
			Image image = Toolkit.getDefaultToolkit().getImage("");
			TrayIcon trayIcon = new TrayIcon(image);

			try {
				tray.add(trayIcon);
			} catch (AWTException e) {
				e.printStackTrace();
			}
		}

		setVisible(true);
	}

	public static void main(String[] args) {
		new TrayFrame();
	}
}

import org.assertj.swing.edt.GuiActionRunner;
import org.assertj.swing.edt.GuiQuery;
import org.assertj.swing.junit.testcase.AssertJSwingJUnitTestCase;
import org.junit.Test;

public class TrayTest extends AssertJSwingJUnitTestCase {

	@Override
	protected void onSetUp() {
	}

	@Test
	public void openFrameWithGuiRunner() {
		GuiActionRunner.execute(new GuiQuery<TrayFrame>() {

			@Override
			protected TrayFrame executeInEDT() {
				return new TrayFrame();
			}
		});
	}
}

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at org.assertj.core.util.Preconditions.checkNotNull(Preconditions.java:76)
	at org.assertj.swing.input.InputState.screenLocation(InputState.java:129)
	at org.assertj.swing.input.InputState.update(InputState.java:112)
	at org.assertj.swing.input.InputState$1.processEvent(InputState.java:72)
	at org.assertj.swing.listener.EventDispatchThreadedEventListener.eventDispatched(EventDispatchThreadedEventListener.java:79)
	at org.assertj.swing.input.EventNormalizer.delegate(EventNormalizer.java:92)
	at org.assertj.swing.input.EventNormalizer.eventDispatched(EventNormalizer.java:87)
	at org.assertj.swing.listener.WeakEventListener.eventDispatched(WeakEventListener.java:82)
	at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2425)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2317)
	at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
	at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2275)
	at java.awt.TrayIcon.dispatchEvent(TrayIcon.java:721)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:763)
	at java.awt.EventQueue.access$500(EventQueue.java:97)
	at java.awt.EventQueue$3.run(EventQueue.java:709)
	at java.awt.EventQueue$3.run(EventQueue.java:703)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
	at java.awt.EventQueue$4.run(EventQueue.java:731)
	at java.awt.EventQueue$4.run(EventQueue.java:729)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[croesch]

On which system and version are you runngin?

Using the latest AssertJ Swing under Linux works well for me. I copied your test and it runs normally - no exception, no test failures.

[angeloBerlin]

Its running fine on MacOS but fails on Windows 10

[croesch]

Thx for the quick answer

[bernardobreder]

I have the same problem in my project and i have no idea how to solve.

I am using this assert library: assertj-core-3.5.1.jar, assertj-swing-3.4.0.jar, assertj-swing-jide-3.4.0.jar, assertj-swing-junit-3.4.0.jar, assertj-swing-testng-3.4.0.jar, bsh-2.0b4.jar, fest-reflect-1.4.1.jar, fest-util-1.2.5.jar, jcommander-1.48.jar, slf4j-api-1.7.16.jar, testng-6.9.10.jar

In the StackTrace, the part org.assertj.swing.input.InputState.screenLocation(InputState.java:129) has event with toString: java.awt.event.MouseEvent[MOUSE_MOVED,(27,382),absolute(27,382),clickCount=0] on java.awt.TrayIcon@530271d6
and the java.awt.event.ComponentEvent.getComponent() say that TrayIcon can not has a Component:
public Component getComponent() {
return (source instanceof Component) ? (Component)source : null;
}

My question is, why this event happened in Windows 10 ?

Sistema Operacional: Windows 10 10.0
Timezone: sun.util.calendar.ZoneInfo[id="GMT-03:00",offset=-10800000,dstSavings=0,useDaylight=false,transitions=0,lastRule=null]
JVM: 1.8.0_131
Exceção:
Tipo: java.lang.NullPointerException
Mensagem: null
Pilha de execução:
java.lang.NullPointerException
at org.assertj.core.util.Preconditions.checkNotNull(Preconditions.java:76)
at org.assertj.swing.input.InputState.screenLocation(InputState.java:129)
at org.assertj.swing.input.InputState.update(InputState.java:112)
at org.assertj.swing.input.InputState$1.processEvent(InputState.java:72)
at org.assertj.swing.listener.EventDispatchThreadedEventListener.eventDispatched(EventDispatchThreadedEventListener.java:79)
at org.assertj.swing.input.EventNormalizer.delegate(EventNormalizer.java:92)
at org.assertj.swing.input.EventNormalizer.eventDispatched(EventNormalizer.java:87)
at org.assertj.swing.listener.WeakEventListener.eventDispatched(WeakEventListener.java:82)
at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2425)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2317)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit$ToolkitEventMulticaster.eventDispatched(Toolkit.java:2316)
at java.awt.Toolkit.notifyAWTEventListeners(Toolkit.java:2275)
at java.awt.TrayIcon.dispatchEvent(TrayIcon.java:721)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:763)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

[bernardobreder]

Someone have any idea how to solve the problem ?

[subes]

Here my go at the problem (also happened to me on ubuntu).

[croesch]

Thanks very much!