On Wed, May 02, 2007 at 03:15:39PM +0100, Matthew Johnson wrote: > On Wed May 02 15:57, Michael Koch wrote: > > On Wed, May 02, 2007 at 01:58:46PM +0100, Matthew Johnson wrote: > > > Two subjects to this mail. Firstly, I had a go at writing a dh_javadeps > > > which will search for jar files, find the classes they reference and > > > find the packages they are in. This can be found at > > > http://mjj29.matthew.ath.cx/dh_javadeps It updates $package.substvars so > > > you can use ${java:Depends} in control files. > > > > Thats really nice to have. Unfortunately it didnt worked on a pretty > > simple example for me. > > Hmm, could you let me know what the example was (it worked on my pretty > simple example)
I created debian/test and put ant.jar into it. Then I executed dh_javadeps -p test As output I got this: xargs: unmatched einfache quote; by default quotes are special to xargs unless you use the -0 option jar: invalid option -- D Try `jar --help' for more information. jar: invalid option -- D Try `jar --help' for more information. jar: invalid option -- D Try `jar --help' for more information. jar: invalid option -- D Try `jar --help' for more information. jar: invalid option -- D Try `jar --help' for more information. jar: invalid option -- D ... > > I tried to this some ago too but there are are some problems that cannot > > be solved easily. Sometimes you dont want to hardly depend on some lib, > > you want only to recommend or suggest. That can be easily fixed I think. > > If the class is used in your jar, surely it needs to be there at > runtime? or would some other switching be applied first so that the JVM > never tries to load the class, even though bits of the code use it? I think about code paths that are only used when you use certain features of a program. When the dependency itself has a long list of depdencies it can make sense to not hardly depend on it when its only needed/used by 0.1% of the users of a program. > > The much bigger problem is reflection. Some code uses reflection to load > > classes. Often the class names are computed at runtime and not visible > > in some binary. > > I'm happy not providing a 100% solution, people can always add extra > depends. The idea is just to provide the simple cases. Reflection isn't > that common. Reflection is more common then you might think. > > Another problem is that very often different jars > > provide classes in the same namespace. Which package do you want to put > > into the dependencies? (javax.servlet comes to my mind) > > It searches by class name rather than package name; I would expect only > one package to provide any given class (as distinct from implementations > of an interface, which should have different packages). Multiple > packages shipping the same classes/interfaces I would consider a bug > (although I've not thought 100% about different versions) No, thats no bug. E.g. we ship different versions of the servlet specification in Debian. ASM is another example. We have currently two major versions in Debian. A third is coming soon. All have similar to equal class names (with sometimes different APIs). Thats no bug. Thats common practice in Java-land. > > > I have also been trying to get dh_nativejava to work with no luck. As > > > far as I can tell, it does nothing regardless of how I run it. What is > > > it meant to do? > > > > It does only something when foo and foo-gcj packages exist. It compiles > > the jars in foo to native and puts them into foo-gcj and registers them > > on installation in the classmap.db. > > ah, right, the documentation is unclear. Do you think there would be any > call for something that compiles the jars to native at install time > (a-la python-support)? No. We decided against this becuase bigger jars need a long time to compile to native. I experienced times of compile one jar to native for about half an hour on a 1.7 Ghz machine. It also doesnt make sense on some of our archs in Debian, e.g. arm or mips/el. Cheers, Michael -- .''`. | Michael Koch <[EMAIL PROTECTED]> : :' : | Free Java Developer <http://www.classpath.org> `. `' | `- | 1024D/BAC5 4B28 D436 95E6 F2E0 BD11 5923 A008 2763 483B -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
