[jira] [Commented] (NETBEANS-3919) NB editor Null-pointer exception because of javac hints, with non-installed nb-javac plug-in

["Geertjan Wielenga (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NETBEANS-3919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17045641#comment-17045641 ] 

Geertjan Wielenga commented on NETBEANS-3919:
---------------------------------------------

Thanks for this very descriptive report.

> NB editor Null-pointer exception because of javac hints, with non-installed nb-javac plug-in
> --------------------------------------------------------------------------------------------
>
>                 Key: NETBEANS-3919
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-3919
>             Project: NetBeans
>          Issue Type: Bug
>          Components: editor - Hints & Annotations, editor - Parsing & Indexing
>    Affects Versions: 11.2, 11.3
>         Environment: Netbeans 11.2 and 11.3_beta
> Ubuntu 18.04 LTS
> OpenJDK 11.0.6 (2020-01-14) , via apt-get installed
>            Reporter: Hans Grimmelshausen
>            Priority: Minor
>              Labels: editor,, exception, hints, ide,, javac,, plugin
>         Attachments: Nullpointer-javac-hints.txt
>
>
> In NB 11.2 +, with un-installed _nb-javac_ plug-in and enabled _Overrides_ editor hint, whilst editing a Java source file containing _Overrides_ situations, a few seconds later NB raises a red Null-pointer exception notification. Please see attached stacktrace text-file.
> How to reproduce the bug, step by step:
> *1)* I use Netbeans Ant projects with JDK11 source-/binary-format, but the bug probably also happens with other project types.
> *2)* When NB asks to install _nb-javac_ plugin, please don't install it. In case it's already installed, un-install it. With enabled _nb-javac_ plugin, the Null-pointer exception bug doesn't happen. (Also the refactoring-rename only works fully with a non-installed _nb-javac_ plug-in.)
> *3)* In NB's menu _Tools_ -> _Options_ -> _Editor_ -> _Hints_ -> _Java_, in section "_Standard javac warnings_", enable the _Overrides_ checkbox.
> *4)* Create a simple mini Java source file with offending source code lines, like:
> {code:java}
> import java.awt.event.ActionEvent;
> import java.awt.event.ActionListener;
> import javax.swing.JCheckBox;
> public class Test {
>    public static void main(String[] parameter)  {
>       JCheckBox jChecker = new JCheckBox();
>       jChecker.addActionListener(new ActionListener() {
>          public void actionPerformed(ActionEvent evt) {
>          }
>       });
>    }
> }{code}
> *5)* Now whenever we edit some of the code in the source file, a few seconds later, when NB's parser wants to check the source code for potential _Overrides_ hint situations, it raises the red Null-pointer exception notification.
> *7)* Work-around: Disable the _Overrides_ checkbox in the NB editor's hints section.



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