Ambiguous method warnings in core_ext/object.rb in 9k

[iconara]

When I run jruby-head I get these warnings (I get it whenever a JRuby process starts up when I run tests with rspec and when I run bundle):

file:/Users/theo/.rvm/rubies/jruby-head/lib/jruby.jar!/jruby/java/core_ext/object.rb:27 warning: ambiguous Java methods found, using isJavaIdentifierStart(int)
file:/Users/theo/.rvm/rubies/jruby-head/lib/jruby.jar!/jruby/java/core_ext/object.rb:28 warning: ambiguous Java methods found, using isJavaIdentifierPart(int)

Looks like it's this method:

jruby/core/src/main/ruby/jruby/java/core_ext/object.rb

Line 27 in 01d560c

cc.java_identifier_start? frag[0].ord and

$ ruby -v
jruby 9000.dev-SNAPSHOT (2.1.2p142) 2014-11-05 624823a Java HotSpot(TM) 64-Bit Server VM 25.0-b70 on 1.8.0-b132 +jit [darwin-x86_64]
$ java -version
java version "1.8.0"
Java(TM) SE Runtime Environment (build 1.8.0-b132)
Java HotSpot(TM) 64-Bit Server VM (build 25.0-b70, mixed mode)

[enebo]

Just a drive-by (meaning I am not looking into this) comment is that in Java 8 some default methods on interfaces are the cause of this. I think some of our internal libraries need to be tweaked to account for these new signatures. You can run on Java 7 to confirm this is the cause (e.g. you should not see the warnings).

[krunal]

Getting same warning while executing 'rails s puma' in development mode and server is getting stuck. And it works perfectly fine with JRuby 1.7.

file:/home/krunal/.rvm/rubies/jruby-head/lib/jruby.jar!/jruby/java/core_ext/object.rb:27 warning: ambiguous Java methods found, using isJavaIdentifierStart(int)
file:/home/krunal/.rvm/rubies/jruby-head/lib/jruby.jar!/jruby/java/core_ext/object.rb:28 warning: ambiguous Java methods found, using isJavaIdentifierPart(int)

java -version
java version "1.7.0_55"
OpenJDK Runtime Environment (IcedTea 2.4.7) (7u55-2.4.7-1ubuntu1~0.13.10.1)
OpenJDK 64-Bit Server VM (build 24.51-b03, mixed mode)

[enebo]

Ok I did not expect this to be an issue with 1.7. The the interface methods are a general cause of this but it must not be this specific issue.

[enebo]

Err Java 1.7 not JRuby 1.7 :) Numbers...what can you do?

[kares]

has been fixed since ... along the lines of 1.7.x releases