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https://issues.apache.org/jira/browse/NETBEANS-5089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17245419#comment-17245419
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Papaioannou T commented on NETBEANS-5089:
-----------------------------------------

I changed my JDK and i managed to stop the problem.

> ActionListener error 
> ---------------------
>
>                 Key: NETBEANS-5089
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-5089
>             Project: NetBeans
>          Issue Type: Bug
>          Components: java - Project
>    Affects Versions: 12.0
>         Environment: Windows 10 Pro
>            Reporter: Papaioannou T
>            Priority: Blocker
>              Labels: ActionListener
>         Attachments: log.txt
>
>
> During java code on JFrame , using NetBeans 12 and JDK 15.0 , after creating 
> a new ActionListener, a sudden exception occurring.
> NetBeans just create a critical error and autocomplete ( at least) is not 
> working, Neither code correction with red underline happens.
> I needed to downgrade and remove JDK 15.0.1( from JDK.java.net) and go to 14 
> (openjdk-14+36_windows-x64_bin). Only then the error stop happening. 
> By adding the next code, on using ctrl+space on "new ActionL" the critical 
> error (attached on log.txt) happened. When i was removing the ActionListener 
> line, everything returned to normal. 
> Here is the part of the code that i was creating:
> previousButton.addActionListener(new ActionListener() {
>             @Override
>             public void actionPerformed(ActionEvent e) {
>                 previousButtonActionPerformed(e);
>             }
>         }); 



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