Using Intellij IDEA with current JDK

[David Lloyd]

What I've done is to force no JDK at all.  It does present an ugly
banner[1] at the top but otherwise it seems to work fine - or did,
until the latest update[2].  If you've already set up a SDK, I think
there's no way to unset it, so you have to close IDEA, edit your
xxx.ipr or .idea/modules.xml (I think) and delete the line which
defines the SDK.

[1] See also: https://youtrack.jetbrains.com/issue/IDEA-142878
[2] The error I see at present is of the type "Package 'java.lang' is
in the unnamed module, but module 'jdk.compiler' does not read it".
Previously I had excluded module-info.java from all source roots, but
the latest update somehow determines that everything are Java 9
modules anyway.  I had done this for two reasons: firstly, there are
not module descriptors in every place where there are sources (for
example, having a separate "java.base:share" and "java.base:unix" IDEA
module causes problems because :share has a module-info.java but :unix
does not), and secondly, IDEA does not cope well with situations where
there is more than one module-info.java (for example if one is
generated from the other) or if it is simply generated to begin with.
Sigh.

On Wed, Jan 17, 2018 at 10:15 AM, Andrew Haley <aph at redhat.com> wrote:
> I now always get "The selected directory is not a valid home for JDK".
> when selecting the JDK home directory.
>
> Does anybody have any idea how to persuade IDEA that we need to work
> on the current top-of-tree JDK?  Thanks.
>
> --
> Andrew Haley
> Java Platform Lead Engineer
> Red Hat UK Ltd. <https://www.redhat.com>
> EAC8 43EB D3EF DB98 CC77 2FAD A5CD 6035 332F A671



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