You could call (import) directly after you've initialised the Gate class:
(gate-init "foo")
(import gate.Factory)
; use Factory class as required
Cheers,
Stuart
On 31 August 2010 01:01, zm <zygiman...@medelis.lt> wrote:
>
> Initialization exception can be avoided if Factory class is
> initialized indirectly:
>
> (let [factory (.newInstance (Class/forName "gate.Factory"))] ...)
>
> The problem is that Factory can only be initialized (its static
> fields) after Gate.init was called. But clojure reader (or what it is)
> initializes all the classes mentioned in the namespace. Thus Factory
> gets created before cojure function calls which do Gate/init.
>
> Is this workaround ok? Or are there better ways to solve it?
>
> On Aug 30, 2:39 pm, zm <zygiman...@medelis.lt> wrote:
> > Indeed if exception is thrown in static initializer block then clojure
> > import throws exception as well.
> >
> > The following class will cause this:
> >
> > package aaa;
> > public class Test {
> > static{
> > Object o = null;
> > o.toString();
> > }
> >
> > }
> >
> > Then in clojure:
> >
> > (ns x (:import (aaa Test))
> >
> > Results in:
> >
> > Exception in thread "main" java.lang.ExceptionInInitializerError
> > (core.clj:1)
> >
> > Why does this happen in clojure? If you do the same in java, import
> > aaa.Test, then nothing happens. NLP will be thrown when you actualy
> > try to initialize the class.
> >
> > On Aug 30, 6:12 am, Stuart Campbell <stu...@harto.org> wrote:
> >
> >
> >
> > > Hello,
> >
> > > I don't know this library specifically, but the NPE is probably
> occurring in
> > > a static initialisation block. I believe static initialisation occurs
> when
> > > the class is first loaded.
> >
> > > Regards,
> > > Stuart
> >
> > > On 30 August 2010 06:42, zm <zygiman...@medelis.lt> wrote:
> >
> > > > I am using GATE java libs in my clojure code and behaviour of the
> > > > application changes after Java class import. I don't even have to
> > > > initialize it.
> >
> > > > This runs fine (a bit shorter version than it is):
> >
> > > > (ns gate
> > > > (:import
> > > > (gate Gate)
> > > > (java.io File)))
> >
> > > > (defn gate-init
> > > > [gate-home]
> > > > (Gate/setGateHome (File. gate-home))
> > > > (Gate/init)))
> >
> > > > Now if I import gate.Factory class, like this (gate Gate Factory), I
> > > > get the exception:
> >
> > > > Caused by: java.lang.NullPointerException
> > > > at gate.Factory.createResource(Factory.java:154)
> >
> > > > How can import of a class cause this?
> >
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