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https://issues.apache.org/jira/browse/NETBEANS-6349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17471106#comment-17471106
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Neil C Smith commented on NETBEANS-6349:
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[~blocked] JDK 11+ if you use Apache convenience binaries, JDK 8 if you build 
from the source release on JDK 8.  The download page on the website is now 
explicit about this (unintended) change, and also that JDK 17 is supported - 
https://netbeans.apache.org/download/nb126/nb126.html 

> Recent builds of the module responsible for java source parsing break BC to 
> JDK 8
> ---------------------------------------------------------------------------------
>
>                 Key: NETBEANS-6349
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-6349
>             Project: NetBeans
>          Issue Type: Bug
>          Components: editor - Parsing & Indexing
>    Affects Versions: 12.5, 12.6
>            Reporter: Thomas Schapitz
>            Assignee: Jaroslav Tulach
>            Priority: Critical
>             Fix For: 13
>
>
> There are 6 linked Issues, that all follow a common pattern, pointing to a 
> common cause:
>  * They are accompanied by an java.lang.NoSuchMethodError: 
> java.nio.CharBuffer.flip()Ljava/nio/CharBuffer;
>  * The users indicate, they are running NB 12.5+ with JDK8
>  * The errors occur during parsing.
> Sure enough, JDK 8 hasn't 
> java.nio.CharBuffer.flip()Ljava/nio/{*}+CharBuffer+{*},
> it has only java.nio.CharBuffer.flip()Ljava/nio/{+}*Buffer,*{+} which it 
> inherits from Buffer.
> Which means: the Module in question has obviously been compiled against a 
> library more recent then JDK8, at least JDK9, which has this method.
>  
> Consequences:
> This and the 6 linked issues will automatically be fixed with the rollout of 
> NB 13, which will require JDK 11 as prerequisite anyway.
> In the mean time, users may work around the problem, by immediately switching 
> to JDK 9+ when executing Netbeans. Note that they should still be able to 
> develop and build for JDKs 8 an prior.  



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