I'm willing to bet that both classloaders have the same clojure runtime in
a common base classloader.
i.e. that cl1.loadClass("clojure.lang.RT") ==
cl2.loadClass("clojure.lang.RT");If the two clojure runtimes were distinct, the assert would indeed fail. Also .equals return false and this assignment would fail: Keyword kw = getKwFromDifferentClassloader(); This would work: Object kw = getKwFromDifferentClassloader(); See here: http://stackoverflow.com/questions/5375349/class-instance-obtained-through-multiple-class-loader For reference: This is a printout of the return value of nrepl/start-server in a completely separated classloader, save for bootstrap classes in the java library (an architecture that I use for my services) {#<Keyword :server-socket> #<ServerSocket ServerSocket[addr= 0.0.0.0/0.0.0.0,localport=4003]>, #<Keyword :port> 4003, #<Keyword :open-transports> #<Atom clojure.lang.Atom@77b8bd8>, #<Keyword :transport> #<transport$bencode clojure.tools.nrepl.transport$bencode@56be0fb6>, #<Keyword :greeting> nil, #<Keyword :handler> #<middleware$wrap_conj_descriptor$fn__693 clojure.tools.nrepl.middleware$wrap_conj_descriptor$fn__693@4608f600>, #<Keyword :ss> #<ServerSocket ServerSocket[addr= 0.0.0.0/0.0.0.0,localport=4003]>} Notice how the printer prints out the {} correctly, because it dispatches on java.util.Map (a common base class from the bootstrap classloader), but fails to recognize the Keywords of a different clojure runtime. >From experiments, I can assure you that (not= :port #<Keyword :port>) Similarly, assoc on this map would fail, because it's only recognized as a j.u.Map, but not as a c.l.PersistentMap. cheers 2014-02-12 17:45 GMT+01:00 Jozef Wagner <jozef.wag...@gmail.com>: > Interning table uses keyword's symbol as a key, and the symbols are > compared by value. See > https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Keyword.java#L37 > > > On Wed, Feb 12, 2014 at 5:23 PM, Arkadiusz Komarzewski < > akomarzew...@gmail.com> wrote: > >> Hi, >> >> I wonder how is equality of keywords implemented in Clojure? >> >> I have this piece of Java code executed in one classloader: >> Keyword a = (Keyword) RT.var("clojure.core", "keyword").invoke("keyword"); >> >> Then, when I pass it to another part of my application (which uses >> another classloader) and do this: >> Keyword b = (Keyword) RT.var("clojure.core", "keyword").invoke("keyword"); >> assert a == b; >> >> Assertion passes. >> Why does it work? If I'm correct, keywords are interned, but since they >> were created in separate classloaders shouldn't that assert fail? >> >> -- >> 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 unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
