Optional means that you can use the product without these dependencies
present. Take commons-logging as an example. It has optional
dependencies on log4j and the other logging implementations. In the real
world though it will only use one of these. So they are optional.
Provided means that that dependency will be provided by the target
environment. A good example of this is the servlet-api, which will be
provided by the servlet container.
James Carman wrote:
The dependencies are truly optional. I marked them as provided so
that they wouldn't get picked up transitively (as you stated) by
client projects. If they want to use the pieces of commons-proxy that
need those extra libs, then they can explicitly add them to their POM.
So, does that mean I should be using optional rather than provided?
On 9/28/07, Ben Speakmon <[EMAIL PROTECTED]> wrote:
Using <scope>provided</scope> doesn't tell maven to ignore the dependency,
it just means that it's expected that the user will install it into his
local repository himself or that it will be on the same classloader as the
application when it's running. maven will still complain if it can't find
it.
Optional dependencies are available from the repository, but not downloaded
unless specifically requested in the POM.
Projects with optional dependencies where client code doesn't call them are
supposed to not break when the optionals are missing. Several projects
happily violate this rule, but I think we should hold ourselves to a higher
standard :)
On 9/28/07, Joerg Hohwiller <[EMAIL PROTECTED]> wrote:
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James Carman wrote:
All,
Hi James,
It's been a while since Commons Proxy has had any attention, but I
have received two emails in the past two days about it. So, I would
like to cut a 1.0 release for it.
A 1.0 would be excellent. I am also still hoping this project will come
out of
sandbox. The problem seems to be that the apache foundation started to
only put projects out on the official places if there is a "healty
community".
However commons-proxy is a lib with a tight focus and already does what is
needs
to do. There are no great new features to discuss.
In my opinion we should bring out a 1.0 that is well tested
and then I personally do NOT see why it should remain in sandbox.
Can someone give a reason against?
Should otherwise the project start to add various of other utilities
into commons-proxy only in order that the community grows, bugs are made
and
fixed, etc.?
If I look at maven2 -what is an excellent tool- and the
dependency-management
it introduces, then I see that if I depend on axis2, I also depend on
commons-fileupload, commons-httpclient and on commons-logging and
therefore on
avalon-framework, junit, logkit, etc. etc. So my client needs JUnit or
avalon to
talk SOAP?
Maven2 is right with the way it goes. But projects have to focus more on
specific issues. This is exactly what commons-proxy does.
BTW: I have seen that commons-proxy is declaring its dependencies with the
scope
"provided" what prevents from the problem noted above with the transitive
dependencies. Maybe you should have a chat with the maven guyz if it
should be
<optional>true</optional> instead. Do you know the difference? I can not
remember right now...
I know I need to do a little work,
since the site is a bit out-dated (the SVN links are incorrect) from
the TLP move. Were there any more objections to anything fundamental
with Proxy? I believe my last release candidate failed because of
some signature problems or something. I can't remember.
James
Regards
Jörg
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