Compilation Warning for Sun proprietary API using

I think it's a bad idea to use Sun proprietary API in the JRuby Souce code since 1.1. Besides, it caused compilation warning.

Buildfile: build.xml

init:

jar:

jar-jruby:

init:

extract-rdocs:

prepare:
[mkdir] Created dir: /home/sma/jruby-1.1.1/build
[mkdir] Created dir: /home/sma/jruby-1.1.1/build/classes
[mkdir] Created dir: /home/sma/jruby-1.1.1/build/classes/jruby
[mkdir] Created dir: /home/sma/jruby-1.1.1/build/classes/test
[mkdir] Created dir: /home/sma/jruby-1.1.1/build/test-results
[mkdir] Created dir: /home/sma/jruby-1.1.1/build/test-results/html
[mkdir] Created dir: /home/sma/jruby-1.1.1/docs/api

compile-tasks:
[copy] Copying 8 files to /home/sma/jruby-1.1.1/build/classes/jruby
[copy] Copying 22 files to /home/sma/jruby-1.1.1/build/classes/jruby/builtin
[copy] Copying 1 file to /home/sma/jruby-1.1.1/build/classes/jruby

compile-annotation-binder:
[mkdir] Created dir: /home/sma/jruby-1.1.1/src_gen
[javac] Compiling 5 source files to /home/sma/jruby-1.1.1/build/classes/jruby
[javac] Note: /home/sma/jruby-1.1.1/src/org/jruby/anno/AnnotationBinder.java uses unchecked or unsafe operations.
[javac] Note: Recompile with -Xlint:unchecked for details.

check-for-optional-java4-packages:

check-for-optional-packages:

compile-jruby:
[apt] Compiling 521 source files to /home/sma/jruby-1.1.1/build/classes/jruby
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:42: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] import sun.misc.Signal;
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:43: warning: sun.misc.SignalHandler is Sun proprietary API and may be removed in a future release
[apt] import sun.misc.SignalHandler;
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:49: warning: sun.misc.SignalHandler is Sun proprietary API and may be removed in a future release
[apt] private final static class JRubySignalHandler implements SignalHandler {
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:55: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] public void handle(Signal signal) {
[apt] ^
[apt] warning: Annotation types without processors: [java.lang.Override, java.lang.SuppressWarnings, java.lang.Deprecated, org.jruby.anno.JRubyConstant, org.jruby.anno.JRubyModule, java.lang.annotation.Retention, java.lang.annotation.Target]
[apt] 5 warnings
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:42: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] import sun.misc.Signal;
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:43: warning: sun.misc.SignalHandler is Sun proprietary API and may be removed in a future release
[apt] import sun.misc.SignalHandler;
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:49: warning: sun.misc.SignalHandler is Sun proprietary API and may be removed in a future release
[apt] private final static class JRubySignalHandler implements SignalHandler {
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:55: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] public void handle(Signal signal) {
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:64: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] Signal.handle(new Signal(this.signal), this);
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:64: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] Signal.handle(new Signal(this.signal), this);
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:75: warning: sun.misc.SignalHandler is Sun proprietary API and may be removed in a future release
[apt] final SignalHandler oldHandler;
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:77: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] oldHandler = Signal.handle(new Signal(handler.signal), handler);
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:77: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] oldHandler = Signal.handle(new Signal(handler.signal), handler);
[apt] ^
[apt] /home/sma/jruby-1.1.1/src/org/jruby/util/SunSignalFacade.java:87: warning: sun.misc.Signal is Sun proprietary API and may be removed in a future release
[apt] oldHandler.handle(new Signal(handler.signal));
[apt] ^
[apt] Note: Some input files use unchecked or unsafe operations.
[apt] Note: Recompile with -Xlint:unchecked for details.
[apt] 10 warnings

compile:

generate-method-classes:
[echo] Generating invokers...
[echo] Compiling populators...
[javac] Compiling 132 source files to /home/sma/jruby-1.1.1/build/classes/jruby
[jarjar] Building jar: /home/sma/jruby-1.1.1/lib/jruby.jar

BUILD SUCCESSFUL
Total time: 45 seconds