How to compile code calling unexpected classes to an older release?

[Jonathan Gibbons]

Keimpe,

If you're compiling against internal JDK classes, you should be using 
the rt.jar from the appropriate release.

-- Jon


On 10/28/16 10:29 AM, Keimpe Bronkhorst wrote:
> Joe,
>
> I don't understand this, doesn't this make "-release 8" useless for 
> any code base that uses an internal JDK API, which is likely most 
> production code bases. For instance, the Windows PLAF classes are 
> often used:
>
> import com.sun.java.swing.plaf.windows.WindowsComboBoxUI;
> class t1 { public static void main(String[] args) {  } }
>
> this will compile fine with either:
> <jdk8_path>/javac t1.java
> <jdk9_path>/javac --add-exports 
> java.desktop/com.sun.java.swing.plaf.windows=ALL-UNNAMED t1.java
>
> but not with either of:
> <jdk9_path>/javac --release 8 t1.java
> <jdk9_path>/javac --release 8 --add-exports 
> java.desktop/com.sun.java.swing.plaf.windows=ALL-UNNAMED t1.java
>
>
> Keimpe Bronkhorst
> JDeveloper Team
>
>
> On 10/27/2016 2:42 PM, compiler-dev-request at openjdk.java.net wrote:
>> Message: 3
>> Date: Thu, 27 Oct 2016 08:59:30 -0700
>> From: joe darcy <joe.darcy at oracle.com>
>> To: compiler-dev at openjdk.java.net
>> Subject: Re: How to compile code calling unexpected classes to an
>>     older    release?
>> Message-ID: <ab2dcc37-9d49-b108-3c8b-26a862208749 at oracle.com>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> On 10/27/2016 2:14 AM, Claes Redestad wrote:
>>> Hi,
>>>
>>> "-XDignore.symbol.file -source 8 -target 8" can get your code to
>>> compile (add -nowarn or set a valid bootclasspath to get rid of the
>>> warning).
>>>
>>> So, it seems --release 8 has issues with internal classes not visible
>>> to javac in 9?
>> By design, --release 8 does not expose internal classes :-)
>>
>> -Joe
>>
>>
>