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https://issues.apache.org/jira/browse/NETBEANS-877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16535650#comment-16535650
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Ross Lamont commented on NETBEANS-877:
--------------------------------------

The issue doesn't happen for all plugins.  In fact I think it only happens for 
some really core plugins, specifically IDE Platform and Ant as mentioned above. 
 When I first encountered this issue some time back before I did a clean 
install, I think I had about 5 plugins in my list, unfortunately I can't 
remember which ones.  Through a trial and error approach I narrowed it down to 
IDE Platform and Ant.

So I think this issue is pretty important given the importance of those plugins.

I'm not going to have a chance to retry this until tomorrow, but because the 
plugins which cause the problem are part of the distro, I don't really get how 
to test it on the latest release.  It would only become testable once new 
versions of IDE Platform or Ant become available.

I suspect this is why it's not been seen too often - most core developers 
probably get up to date builds and so don't get to see the process of updating 
core plugins that often.  Of course that is speculation and I don't mean to 
incidentally disparage anyone!

So in terms of doing a test, I'd take the following steps:
 * Delete your cache and user directory
 * Install and start rc1 (not rc2)
 * Choose not to import old settings and plugins
 * Run an update from the plugin update centre.  You should get asked about 
+IDE Platform+ and +Ant+ and perhaps others. For the sake of consistency, only 
choose to update those 2.

Hopefully you can reproduce the problem this way - that is what I did last 
night.

> netbeans 9.0 rc1 : cannot update plugins : java source base version 2 required
> ------------------------------------------------------------------------------
>
>                 Key: NETBEANS-877
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-877
>             Project: NetBeans
>          Issue Type: Bug
>          Components: java - Source
>    Affects Versions: 9.0
>         Environment: openjdk version "9-Debian"
> OpenJDK Runtime Environment (build 9-Debian+0-9b181-4bpo91)
> OpenJDK 64-Bit Server VM (build 9-Debian+0-9b181-4bpo91, mixed mo
>            Reporter: hanasaki jiji
>            Priority: Major
>             Fix For: 9.0
>
>
> (I) created as "blocker"  because it happens on first install and fails all 
> plugin updates.
> installed rc1 (linux openjdk9 with the source package too - on debian 9)
>  java -version 
>  openjdk version "9-Debian" 
>  OpenJDK Runtime Environment (build 9-Debian+0-9b181-4bpo91) 
>  OpenJDK 64-Bit Server VM (build 9-Debian+0-9b181-4bpo91, mixed mode)
>  
>  netbeans updates are available however the following error is reported.  
> This happened with the beta's and with jdk10 too.
> Some plugins require plugin Java Source Base to be installed.
>  The plugin Java Source Base is requested in implementation version 2.
>          The following plugin is affected: Java Shell Support



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