Hello, note that with java 6 you can specify at once to add all the jars located in a directory:
java -cp "libs/*" clojure.main and you can place any jar you want in directory libs. and this is composable: java -cp "clojure.jar:libs/*" clojure.main My 0.02€, just in case you didn't know this (rather recent) possibility. 2010/7/1 Paul Moore <p.f.mo...@gmail.com>: > First, a disclaimer - I don't have any problem with the idea of the > classpath in Java. In principle, it's pretty similar to Python's > sys.path. And jar files are much like Python having zip files on > sys.path. So I'm familiar with the idea. > > Where I struggle is with the practicalities of managing the classpath. > From what I can tell, there is no way of modifying the classpath from > a running Java/Clojure program (barring use of a custom classloader > which sounds like deep magic). So, assuming that is right, I need to > list my dependencies in advance, when I start the JVM (either by > setting the CLASSPATH environment variable, or with the -classpath > argument). > > Generally, I avoid using "global" environment variables like CLASSPATH > (except if they are locally set in a wrapper script), so I guess that > I have the following options for my Clojure applications: > > * Use something like lein uberjar to wrap all my dependencies up in one file > * Create an application-specific wrapper, which sets CLASSPATH (or > uses -cp) and runs my application > > I have personal reservations about both of these options (I won't > elaborate, to avoid boring people with my prejudices - ask if you > really want to know) so I guess my question would be - is there > another option I have missed? > > Python doesn't have these issues because (a) conventionally, > dependencies are installed into the site-packages directory which is > on the standard sys.path - it appears to me that the JVM doesn't have > such an "always available" install location, and (b) for special cases > sys.path can be manipulated at runtime (as noted above, the JVM > doesn't really have this option). > > One further question - does having a lot of entries on CLASSPATH slow > down JVM code (either at startup time, or in terms of slowing down > runtime class loading)? Essentially, is there a cost to including > things like clojure-contrib "just in case"? (I don't imagine that the > cost would be significant for just one such case, but I could imagine > that if the practice were to become common, it wouldn't be long before > there were many extra entries, not just one). > > I appreciate that this question is only tangentially Clojure-related. > If there is a better forum to discuss this type of question, please > feel free to direct me there. > > Thanks, > Paul. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
