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From Sylvain Wallez <>
Subject Re: Cocoon and Sling
Date Sat, 02 May 2009 07:44:14 GMT
Ralph Goers wrote:
> On May 1, 2009, at 4:45 AM, Sylvain Wallez wrote:
>> dynnamitt wrote:
>>> Thanks man, I didn't know about that Phone-home feat.
>>> I did not however see GPL as an issue since the JVM(7) itself soon 
>>> becomes a member.
>>> Does this mean that all apache apps will be stuck in JVM6 land ??
>> The GPL is "imposed freedom", in that it states that any derived 
>> works of a GPL'ed product should also be GPL licensed itself, and 
>> thus that its source code should be distributed with the product.
>> When your product (or Cocoon for that matter) uses classes from 
>> XMLCalabash, it becomes a derived product and thus must be GPL'ed. 
>> This is why any GPL library is a big no-no at Apache, since the 
>> Apache license is much more liberal and allows proprietary usage.
>> The case of the JVM is different, because a Java application is not a 
>> derived work of the JVM, and only relies on the Java specification 
>> and the .class file format. You can then run your program on any 
>> virtual machine that understands this class file format.
>> And by the way, Apache has an Apache-licensed virtual machine: 
> Actually, this isn't quite accurate. Java applications are "derivitive 
> works" (by the GPL definition) of the Java Library. However, OpenJDK 
> uses GPL with the classpath exception for the library. The classpath 
> exception is similar to the LGPL in that it says that your derived 
> work can be under a different license. See 

Hmm... true, but GPL virality only applies to distribution, i.e. when 
you ship in a same package a GPL'ed JDK and an application. When the 
end-user installs a Java application in an environment that already has 
a JDK, this user is the one doing the assembly, out of the control of 
the initial developer.

The JDK APIs specification and the class file format specification 
aren't GPL'ed, meaning you can develop a non-GPL'ed application using 
any implementation of these specifications, even simple stubs that just 
make the compiler happy.

Anyway, the rule of thumb for Dynnamitt is that adding a GPL'ed library 
to an Apache project is simply not possible.


Sylvain Wallez -

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