Get NullPointerException whenever Library window is visible

[jamztheman]

Get NullPointerException whenever Library window is visible

[JamzTheMan]

Mmm, I guess that's not getting captured. You don't have any resources added to your library?

[ElJefeRaptor5426]

I had some link from my Downloads folder. Other than that it was just the Default resources from a fresh install. I tried removing the resources in Downloads same issue. Is there a way to remove everything from Resources to start fresh?

[JamzTheMan]

Try deleting your .maptool-nerps folder and restarting maptool, that should reset everything. (You can also rename/backup this folder first if you want).

Possibly there is a bad/unexpected file in your resources, a non-image file maybe?

[bloy]

I'm seeing this too. I've tried deleting ~/.maptool-Nerps and deleting and reinstalling Maptool. I'm on Windows. I've been able to narrow it down to only when the library pane is supposed to be visible.

Edit, literally minutes later: ... and I think I've managed to fix it... I managed to click on the default library folder in the library, and that made the error stop popping up. No idea why that persisted after deleting my .maptool-Nerps directory though.

Original comment below for posterity.

It seemed to start happening after I a) left maptool running for a while (over 24h), and b) started that maptool as a server, and c) started another maptool (from the same account) as a client, ignoring the autosave warning.

Here's the stack trace just after opening maptool:

java.lang.NullPointerException
	at net.rptools.maptool.client.ui.assetpanel.ImageFileImagePanelModel.getImage(ImageFileImagePanelModel.java:162)
	at net.rptools.lib.swing.ImagePanel.paintComponent(ImagePanel.java:183)
	at java.desktop/javax.swing.JComponent.paint(JComponent.java:1074)
	at java.desktop/javax.swing.JComponent.paintToOffscreen(JComponent.java:5255)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBufferedImpl(RepaintManager.java:1633)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1608)
	at java.desktop/javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1546)
	at java.desktop/javax.swing.RepaintManager.paint(RepaintManager.java:1313)
	at java.desktop/javax.swing.JComponent._paintImmediately(JComponent.java:5203)
	at java.desktop/javax.swing.JComponent.paintImmediately(JComponent.java:5013)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:857)
	at java.desktop/javax.swing.RepaintManager$4.run(RepaintManager.java:840)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:840)
	at java.desktop/javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:815)
	at java.desktop/javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:764)
	at java.desktop/javax.swing.RepaintManager.access$1200(RepaintManager.java:69)
	at java.desktop/javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1880)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:770)
	at java.desktop/java.awt.EventQueue.access$600(EventQueue.java:97)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:740)
	at net.rptools.maptool.client.swing.MapToolEventQueue.dispatchEvent(MapToolEventQueue.java:38)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117)
	at java.desktop/java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190)
	at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235)
	at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.desktop/java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233)
	at java.desktop/java.awt.Dialog.show(Dialog.java:1070)
	at java.desktop/java.awt.Component.show(Component.java:1674)
	at java.desktop/java.awt.Component.setVisible(Component.java:1621)
	at java.desktop/java.awt.Window.setVisible(Window.java:1031)
	at java.desktop/java.awt.Dialog.setVisible(Dialog.java:1005)
	at net.rptools.maptool.client.swing.MapToolEventQueue.displayPopup(MapToolEventQueue.java:68)
	at net.rptools.maptool.client.swing.MapToolEventQueue.dispatchEvent(MapToolEventQueue.java:50)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:117)
	at java.desktop/java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190)
	at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235)
	at java.desktop/java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at java.desktop/java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233)
	at java.desktop/java.awt.Dialog.show(Dialog.java:1070)
	at java.desktop/java.awt.Component.show(Component.java:1674)
	at java.desktop/java.awt.Component.setVisible(Component.java:1621)
	at java.desktop/java.awt.Window.setVisible(Window.java:1031)
	at java.desktop/java.awt.Dialog.setVisible(Dialog.java:1005)
	at net.rptools.maptool.client.swing.MapToolEventQueue.displayPopup(MapToolEventQueue.java:68)
	at net.rptools.maptool.client.swing.MapToolEventQueue.dispatchEvent(MapToolEventQueue.java:50)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

[JamzTheMan]

There currently is a bug that when MT starts, it attempts to select the "Last" directory/location in your Resource Library that you had selected. If this happens to now be missing or a corrupted location, you get this error.

Selecting a new folder in Resource Library should fix the issue.