NPE when Evaulate Expression window is opening

[jherkel]

Apache NetBeans version

Apache NetBeans 27

What happened

When I try to open Evaulate Expression window I can see NPE and wrong content of this window

After some time this invalid content is hidden and the window is inactive (I cannot see cursor or type some text).

Sometime this state is reverted and the second attempt shows correct Evaulate Expression window but usually it stays in an invalid state.

Log

SEVERE [org.openide.util.Exceptions]
java.lang.NullPointerException: Cannot invoke "Object.hashCode()" because "key" is null
	at java.base/java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:948)
	at org.netbeans.api.editor.mimelookup.MimePath.parse(MimePath.java:203)
	at org.netbeans.api.editor.mimelookup.MimeLookup.getLookup(MimeLookup.java:111)
	at org.netbeans.spi.editor.highlighting.support.HighlightsContainers$1InlineHintsSettingsAwareContainer.<init>(HighlightsContainers.java:41)
	at org.netbeans.spi.editor.highlighting.support.HighlightsContainers.inlineHintsSettingAwareContainer(HighlightsContainers.java:78)
	at org.netbeans.modules.java.editor.semantic.HighlightsLayerFactoryImpl.createLayers(HighlightsLayerFactoryImpl.java:42)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager$Highlighting.rebuildAllLayersImpl(HighlightingManager.java:378)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager$Highlighting$4.run(HighlightingManager.java:357)
	at java.desktop/javax.swing.text.AbstractDocument.render(AbstractDocument.java:442)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager$Highlighting.rebuildAllLayers(HighlightingManager.java:354)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager$Highlighting.rebuildAll(HighlightingManager.java:340)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager$Highlighting.<init>(HighlightingManager.java:202)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager.<init>(HighlightingManager.java:150)
	at org.netbeans.modules.editor.lib2.highlighting.HighlightingManager.getInstance(HighlightingManager.java:78)
	at org.netbeans.modules.editor.hints.HintsUI.caretUpdate(HintsUI.java:980)
	at org.netbeans.modules.editor.hints.HintsUI.setComponent(HintsUI.java:181)
	at org.netbeans.modules.editor.hints.HintsUI.propertyChange(HintsUI.java:902)
	at java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:343)
	at java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:335)
	at org.netbeans.api.editor.EditorRegistry.fireEvents(EditorRegistry.java:544)
	at org.netbeans.api.editor.EditorRegistry.register(EditorRegistry.java:288)
	at org.netbeans.api.editor.EditorRegistry$PackageAccessor.register(EditorRegistry.java:780)
	at org.netbeans.editor.BaseTextUI.installUI(BaseTextUI.java:221)
	at java.desktop/javax.swing.JComponent.setUI(JComponent.java:740)
	at java.desktop/javax.swing.text.JTextComponent.setUI(JTextComponent.java:335)
	at org.netbeans.editor.BaseKit.install(BaseKit.java:729)
	at org.netbeans.modules.editor.java.JavaKit.install(JavaKit.java:278)
	at java.desktop/javax.swing.JEditorPane.setEditorKit(JEditorPane.java:1101)
	at org.netbeans.api.editor.DialogBinding.bind(DialogBinding.java:149)
	at org.netbeans.api.editor.DialogBinding.bindComponentToFile(DialogBinding.java:108)
	at org.netbeans.modules.debugger.jpda.ui.WatchPanel$3.run(WatchPanel.java:379)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:313)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:702)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
	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)
Caused: java.lang.reflect.InvocationTargetException
	at java.desktop/java.awt.EventQueue.invokeAndWait(EventQueue.java:1312)
	at java.desktop/java.awt.EventQueue.invokeAndWait(EventQueue.java:1287)
	at java.desktop/javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1474)
[catch] at org.netbeans.modules.debugger.jpda.ui.WatchPanel.setupContext(WatchPanel.java:391)
	at org.netbeans.modules.debugger.jpda.ui.WatchPanel.setupContext(WatchPanel.java:154)
	at org.netbeans.modules.debugger.jpda.ui.JPDACodeEvaluator.setupContext(JPDACodeEvaluator.java:76)
	at org.netbeans.modules.debugger.ui.eval.CodeEvaluatorUI.setupContextLazily(CodeEvaluatorUI.java:236)
	at org.netbeans.modules.debugger.ui.eval.CodeEvaluatorUI.access$400(CodeEvaluatorUI.java:67)
	at org.netbeans.modules.debugger.ui.eval.CodeEvaluatorUI$2.run(CodeEvaluatorUI.java:208)
	at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1403)
	at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
	at org.openide.util.lookup.Lookups.executeWith(Lookups.java:287)
	at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2018)
SEVERE [global]
java.lang.NullPointerException: Cannot read field "x" because "r" is null
	at java.desktop/javax.swing.JComponent.repaint(JComponent.java:4920)
	at org.netbeans.api.editor.caret.CaretItem.setCaretBoundsWithRepaint(CaretItem.java:235)
	at org.netbeans.api.editor.caret.EditorCaret.update(EditorCaret.java:2046)
	at org.netbeans.api.editor.caret.EditorCaret.access$400(EditorCaret.java:143)
	at org.netbeans.api.editor.caret.EditorCaret$7.run(EditorCaret.java:1929)
	at org.netbeans.api.editor.caret.EditorCaret.dispatchUpdate(EditorCaret.java:1943)
	at org.netbeans.api.editor.caret.EditorCaret.runTransaction(EditorCaret.java:1670)
	at org.netbeans.api.editor.caret.EditorCaret.setDot(EditorCaret.java:577)
	at org.netbeans.api.editor.caret.EditorCaret.setDot(EditorCaret.java:546)
	at org.netbeans.api.editor.caret.EditorCaret$ListenerImpl.mousePressed(EditorCaret.java:2851)
	at java.desktop/java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:290)
	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6573)
	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3404)
	at java.desktop/java.awt.Component.processEvent(Component.java:6341)
	at java.desktop/java.awt.Container.processEvent(Container.java:2260)
	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4958)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2318)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4790)
	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4917)
	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4557)
	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4501)
	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2304)
	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2671)
	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4790)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:725)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:702)
	at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:136)
[catch] 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)

Language / Project Type / NetBeans Component

No response

How to reproduce

Start debug a project and during debuging try to open Evaulate Expression window.

Did this work correctly in an earlier version?

No / Don't know

Operating System

Fedora Linux 42 (kernel 6.15.10 and 6.16.2) Wayland

JDK

JDK 24 and JDK 25

Apache NetBeans packaging

Apache NetBeans binary zip

Anything else

No response

Are you willing to submit a pull request?

No

[neilcsmith-net]

Seems to be a regression caused by #8019 cc/ @lahodaj

[neilcsmith-net]

@jherkel can you try switching off View / Show Inline Values and restarting the IDE? Does that then work for you?

[jherkel]

I tried to disable Show Inline Values but without success. What I found out is that if Evaulate Expression windows wasn't closed when debugger was stopped then during the next debug session everything worked i.e I mean that the Evaulate Expression window opens automatically when debuger starts