Getting Java Class objects, and JSS
evenson at panix.com
Wed Jul 8 07:27:46 UTC 2015
> On 07 Jul 2015, at 22:24, John Pallister <john at synchromesh.com> wrote:
> Some of the tutorials have code like:
> context.addServlet(HelloServlet.class, "/");
> Is it possible to get Class objects for Java classes I've made with JNEW-RUNTIME-CLASS (or indeed for any other Java class)?
Since all Java references to non-primitive types descend from java.lang.Object,
one may always get a reference to the class object by [calling the “getClass()”
> I've been using "raw" JCLASS & JMETHOD etc. calls to experience just how
> painful that really is, but I'm apprehensive about using JSS and paying the
> runtime dynamic dispatch penalty, given that on GAE time is money. Something
> more like a SLIME plug-in that looked up & cached classes, methods & fields at
> editing time (perhaps also parsing Java expressions) and generated "statically
> typed" code would be nice (possibly using code from e.g. JDEE and/or CEDET) -
> has anyone else thought about this?
I wouldn’t necessarily be afraid of the “penalty" for using JSS, or at least, I
might benchmark the difference in performance before shying away from JSS at
JSS [already creates a cache of all classes that on the classpath].
JSS:JAVA-CLASS-METHOD-NAMES provides a listing of all methods of a class, which
is not currently cached, but could be. Extending this to java fields would be
useful. I would welcome patches to JSS which extends these introspection
facilities as the basis for the tooling you wish to build.
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