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https://issues.apache.org/jira/browse/NETBEANS-4623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182666#comment-17182666
]
Karl Tauber commented on NETBEANS-4623:
---------------------------------------
Fix for NETBEANS-4444 (PR [2188|https://github.com/apache/netbeans/pull/2188])
is probably responsible for this issue (and for NETBEANS-4620 too).
The {{NullPointerException}} in {{BasicTextUI.modelToView()}} (e.g. in attached
idelog-3.txt) occurs within the property change listener added to
{{SearchComboBoxEditor}} at in above PR [at line
137|https://github.com/junichi11/netbeans/blob/a44b5b225f4cf1fc72a5a82416e58a0b7cde3fa9/ide/editor.search/src/org/netbeans/modules/editor/search/SearchComboBoxEditor.java#L137].
See {{SearchComboBoxEditor$3.propertyChange()}} in following stack (from
idelog-3.txt):
{noformat}
java.lang.NullPointerException
at
java.desktop/javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:1104)
at
java.desktop/javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:1089)
at
java.desktop/javax.swing.plaf.basic.BasicTextUI.modelToView(BasicTextUI.java:1065)
at
org.netbeans.modules.editor.search.SearchComboBoxEditor$ManageViewPositionListener.changed(SearchComboBoxEditor.java:290)
at
org.netbeans.modules.editor.search.SearchComboBoxEditor$ManageViewPositionListener.removeUpdate(SearchComboBoxEditor.java:277)
at
org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.removeUpdate(PriorityDocumentListenerList.java:91)
at
java.desktop/javax.swing.text.AbstractDocument.fireRemoveUpdate(AbstractDocument.java:261)
at
org.netbeans.editor.BaseDocument.fireRemoveUpdate(BaseDocument.java:1650)
at org.netbeans.editor.BaseDocument.handleRemove(BaseDocument.java:1022)
at
org.netbeans.editor.BaseDocument$FilterBypassImpl.remove(BaseDocument.java:2639)
at
java.desktop/javax.swing.text.DocumentFilter.remove(DocumentFilter.java:79)
at org.netbeans.editor.BaseDocument.remove(BaseDocument.java:935)
at
org.netbeans.modules.editor.search.SearchComboBoxEditor$3.propertyChange(SearchComboBoxEditor.java:137)
at
java.desktop/java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:341)
at
java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:333)
at
java.desktop/java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:266)
at
java.desktop/java.awt.Component.firePropertyChange(Component.java:8728)
at
java.desktop/javax.swing.text.JTextComponent.setCaret(JTextComponent.java:604)
at org.netbeans.editor.BaseTextUI.uninstallUI(BaseTextUI.java:251)
{noformat}
At this time field {{BasicTextUI.editor}} is {{null}} and causes the NPE. And
the NPE in {{modelToView()}} prevents the installation of a new UI for the text
component, which causes subsequent NPEs e.g. in
{{BasicTextUI.getPreferredSize()}}.
> NullPointerException in BasicTextUI.getPreferredSize
> ----------------------------------------------------
>
> Key: NETBEANS-4623
> URL: https://issues.apache.org/jira/browse/NETBEANS-4623
> Project: NetBeans
> Issue Type: Bug
> Affects Versions: 12.1
> Environment: Product Version: Apache NetBeans IDE 12.1-beta3
> Java: 14.0.2; Java HotSpot(TM) 64-Bit Server VM 14.0.2+12-46
> Runtime: Java(TM) SE Runtime Environment 14.0.2+12-46
> System: Windows 10 version 10.0 running on amd64
> Reporter: Czukowski
> Assignee: Karl Tauber
> Priority: Major
> Attachments: idelog-2.txt, idelog-3.txt, idelog-4.txt, idelog-5.txt,
> idelog-6.txt, idelog-7.txt, idelog-8.txt, image-2020-07-23-14-53-04-101.png
>
>
> Was testing 12.1 beta1 today, during my normal activity I noticed an error
> icon in the status bar at the bottom. The IDE was responsive and everything
> seemingly working so far.
> Upon clicking the icon, where the Notification panel would appear, only a
> blank space appears instead of it. If I try to open a file from Project or
> Files panels, similar things happen, editor tabs do open, but they are blank
> and gray.
> Other IDE dialogs (that are not panels) can still be open without issues.
> The only way I've found to get rid of the issue is to restart the IDE. It did
> happen a few times after that too, it wasn't clear which action has triggered
> the issue.
> !image-2020-07-23-14-53-04-101.png!
> See the attachment for the IDE log, this error can be seen repeated there
> multiple times.
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