Daniel,
I'll check out OSGi (you might be right about the cure being worse). I
think Java 9 modules were originally supposed to include versioning as
well, but currently "The State of the Module System" says "A module’s
declaration does not include a version string, nor constraints upon the
version strings of the modules upon which it depends. This is intentional:
It is not a goal
<http://openjdk.java.net/projects/jigsaw/spec/reqs/02#version-selection> of
the module system to solve the version-selection problem, which is best
left to build tools and container applications".
On Thursday, March 16, 2017 at 4:29:47 PM UTC-4, Daniel Compton wrote:
>
> One option to help with this is OSGi which does have support in Clojure.
> https://github.com/talios/clojure.osgi
>
> As Stuart alluded to in his message, the cure to dependency conflicts
> (OSGi) may be worse than the disease. I’d guess that the venn diagram of
> people using both Clojure and OSGi is pretty thin. There is also
> Jigsaw/JPMS in the upcoming Java 9 which is another take on modularity:
> https://www.infoq.com/articles/java9-osgi-future-modularity.
>
> On Fri, Mar 17, 2017 at 5:20 AM <[email protected] <javascript:>>
> wrote:
>
>> Howard, thanks for posting that library. I've passed on the info to some
>> of the other developers at work. That kind of tool is highly valuable, I'll
>> likely start using it soon.
>>
>> Gary, the MrAnderson approach sounds similar to shading; I'll take a look
>> today.
>>
>> Stuart, the most common approach boils down to trust and hope, and I
>> don't think it's good enough. As projects grow larger the likelihood of
>> running into incompatibilities also grows, regardless of community
>> etiquette. Thank you for suggesting :pendantic.
>>
>>
>> On Tuesday, March 14, 2017 at 4:49:50 PM UTC-4, Howard M. Lewis Ship
>> wrote:
>>
>>> We have some very, very complex projects that bring in boat-loads of
>>> dependencies, some of which will have version conflicts, if left
>>> unchecked. I've created a Leiningen plugin, vizdeps, to make it easier to
>>> see the artifact tree, identify and repair conflicts, and determine why any
>>> particular artifacts are in the build.
>>>
>>> https://github.com/walmartlabs/vizdeps
>>>
>> On Mon, Mar 13, 2017 at 1:45 PM, Stuart Sierra <[email protected]>
>>> wrote:
>>>
>> This is a well-known problem in the JVM world, not just Clojure.
>>>>
>>>> The most common approach is: Always use the latest versions, and don't
>>>> break backwards-compatibility.
>>>>
>>>> Most open-source Java and Clojure libraries are careful about not
>>>> breaking backwards-compatibility. So in general, you're safe choosing the
>>>> latest version of any library.
>>>>
>>>> Leiningen has the `:pedantic` option which can be set to warn or fail
>>>> when there are possible dependency conflicts.
>>>>
>>>> Neither Clojure nor the JVM has explicit support for linking to
>>>> specific versions of a library. Work-arounds exist, but they often
>>>> increase
>>>> overall complexity and lead to conflicts which are harder to debug.
>>>>
>>>> –S
>>>>
>>>>
>>>> On Monday, March 13, 2017 at 4:13:19 PM UTC-4, arthur wrote:
>>>>>
>>>>> Hello All,
>>>>>
>>>>>
>>>>> I have a general inquiry regarding conflicting dependencies in
>>>>> Clojure projects and how they affect applications at runtime. I believe
>>>>> this is a common problem faced by many languages in this day and age
>>>>> where
>>>>> we try not to reinvent the wheel by depending on the work of others.
>>>>> Basically: my application depends on libraries *A*, *B*, *C*, and *D*.
>>>>> Libraries *B*, *C*, *D* *also* depend on library *A*, but all of us
>>>>> depend on *different versions* of library *A.* Leiningen thankfully
>>>>> warns us in many of these situations by suggesting exclusions. However,
>>>>> how
>>>>> can I possibly know that something hasn't broken? Stringent testing can
>>>>> give a certain degree of confidence that things are still working, but it
>>>>> would seem to me that to ensure correctness, we should include *all*
>>>>> versions
>>>>> of the dependencies and have the functions link to their respective
>>>>> *versioned* identites. Does anyone have advice on how they solve
>>>>> these kinds of problems on their codebases in the wild? Thankfully
>>>>> nothing
>>>>> has broken yet (to my knowledge), but it seems we have very few
>>>>> assurances
>>>>> here and the best we can do is *hope* nothing is broken. Any advice
>>>>> is much appreciated.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Arthur
>>>>>
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>>>
>>> --
>>> Howard M. Lewis Ship
>>>
>>> Senior Mobile Developer at Walmart Labs
>>>
>>> Creator of Apache Tapestry
>>>
>>> (971) 678-5210
>>> http://howardlewisship.com
>>> @hlship
>>>
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> Daniel
>
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