Hi Josip, Have a look in jvm/clojure/lang/Repl.java which demonstrates creating and entering the 'user namespace.
The key is that you need to wrap the call to in-ns in Var.pushThreadBindings(IPersistentMap) / Var.popThreadBindings(). This is analogous to: (binding [*ns* *ns*] ;; bind a thread-local copy of *ns* so changes are isolated to this thread (....)) See also: http://clojure.org/vars The root binding of Clojure vars are immutable, but using the (binding) construct you can override the value within the scope of the (binding) form. The clojure/*ns* var is no different and this is why you see Repl.java establishes a thread-local binding before evaluating user code. This allows you to change the namespace at the REPL. Hope this helps. /mike. On Wed, Sep 3, 2008 at 5:06 PM, Josip Gracin <[EMAIL PROTECTED]> wrote: > > Hi! > > Why is the following code throwing an exception? > > PushbackReader rdr = new PushbackReader( new StringReader( "(in-ns > 'user)" ) ); > Object input = LispReader.read(rdr, false, null, false ); > clojure.lang.Compiler.eval( input ); > > java.lang.IllegalStateException: Can't change/establish root binding > of: *ns* with set > at clojure.lang.Var.set(Var.java:170) > at clojure.lang.RT$1.invoke(RT.java:206) > at clojure.eval__2237.invoke(Unknown Source) > at clojure.lang.Compiler.eval(Compiler.java:3847) > ... > > I'm trying to set the namespace so that subsequent expressions are > evaluated within it. > > > > --~--~---------~--~----~------------~-------~--~----~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~----------~----~----~----~------~----~------~--~---
