modulepath and classpath mixture

[Robert Scholte]

Hi,

I noticed[1] that -addmods already has a special option: ALL-SYSTEM
What I'm looking for is something like ALL-MP or ALL-MODULEPATH, which  
simply exposes all modules on the modulepath to the classpath. The set of  
moduleEntries on the modulePath are already chosen with care and are in  
the end all required to be able to compile the test-classes without the  
need of knowing the name of the module being used to compile with.

thanks,
Robert

[1] http://openjdk.java.net/jeps/261


On Tue, 23 Feb 2016 01:52:50 +0100, Jonathan Gibbons  
<jonathan.gibbons at oracle.com> wrote:

>
>
> On 02/22/2016 12:44 PM, Robert Scholte wrote:
>> Hi,
>>
>> first of all I'd like to say that I'm very pleased with the new -mp  
>> options, these matches better with the way Apache Maven would like to  
>> work with jars and class-folders.
>>
>> Here's my use case: I noticed that if I add a module-info to  
>> src/main/java and put all compile-scoped dependencies to the module  
>> path, all compiles fines.
>> I assume that developers are less interested in adding a  
>> module-info.java file to src/test/java, so that's what I'm doing right  
>> now too.
>> Now it seems that I *must* add compile + test scoped to the *classpath*  
>> to be able to compile the test classes.
>> My first approach was to leave the compile-scoped dependencies on the  
>> modulepath and all test-scoped dependencies on the classpath, so the  
>> modules keeps their inner related structure, but it seems that the  
>> classpath classes cannot access the modulepath classes.
>>
>> I'm looking for the confirmation that putting all dependencies on the  
>> classpath is indeed the right approach in this case.
>>
>> thanks,
>> Robert
>
> Robert,
>
> We definitely need some more detailed notes on setting up javac  
> compilations (note to self!) but one thing to note is that by default,  
> the unnamed module (i.e. code on the classpath) only has observability  
> of the modules in the system image. To make modules on the module path  
> observable, you need to use the -addmods option.
>
> -- Jon


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