Details
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Type:
Bug
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Status:
Resolved
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Priority:
Major
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Resolution: Fixed
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Affects Version/s: JRuby 1.7.0.pre2
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Fix Version/s: JRuby 1.7.0.RC1
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Component/s: None
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Labels:None
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Environment:MacOS 10.7.3, Netbeans 7.2
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Testcase included:yes
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Number of attachments :
Description
There seems to be an issue with a combination of public_send() (or send()) and
method_missing() when trying to call a method named "warn". The issue appears
with JRuby, but not when running the same code in Ruby from the command line.
First, the test case:
@Test
public void shouldRunFine() {
ScriptingContainer container = new ScriptingContainer();
container.runScriptlet(
"class Me \n" +
"def method_missing(method_name, *args, &block) \n" +
"puts \"you have called: #{method_name}\" \n" +
"end \n" +
"end \n" +
"m = Me.new \n" +
"m.public_send(:info) \n" +
"m.public_send(:blah) \n" +
"# problem happens just here: \n" +
"m.public_send(:warn) \n"
);
}
As above the code throws an exception on last line, output:
------------- Standard Output ---------------
you have called: info
you have called: blah
------------- ---------------- ---------------
------------- Standard Error -----------------
NoMethodError: private method `warn' called for Me:Class
public_send at org/jruby/RubyKernel.java:1784
(root) at <script>:10
------------- ---------------- ---------------
Testcase: shouldRunFine(org.magnepath.general.RubyCallerTest): Caused an ERROR
(NoMethodError) private method `warn' called for Me:Class
org.jruby.embed.EvalFailedException: (NoMethodError) private method `warn' called for Me:Class
at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:133)
at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1264)
at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1257)
at org.magnepath.general.RubyCallerTest.shouldRunFine(RubyCallerTest.java:80)
Caused by: org.jruby.exceptions.RaiseException: (NoMethodError) private method `warn' called for Me:Class
at org.jruby.RubyKernel.public_send(org/jruby/RubyKernel.java:1784)
at RUBY.(root)(<script>:10)
The failure happens on script line 10, which is the attempted call to "warn".
The other invovations of public_send() work as expected.
If I change the final line to use "send(:warn)" instead of public_send(), I get:
------------- Standard Output ---------------
you have called: info
you have called: blah
------------- ---------------- ---------------
------------- Standard Error -----------------
ArgumentError: wrong number of arguments calling `warn` (0 for 1)
__send__ at org/jruby/RubyBasicObject.java:1667
send at org/jruby/RubyKernel.java:2060
(root) at <script>:10
------------- ---------------- ---------------
Testcase: shouldRunFine(org.magnepath.general.RubyCallerTest): Caused an ERROR
(ArgumentError) wrong number of arguments calling `warn` (0 for 1)
org.jruby.embed.EvalFailedException: (ArgumentError) wrong number of arguments calling `warn` (0 for 1)
at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:133)
at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1264)
at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1257)
at org.magnepath.general.RubyCallerTest.shouldRunFine(RubyCallerTest.java:80)
Caused by: org.jruby.exceptions.RaiseException: (ArgumentError) wrong number of arguments calling `warn` (0 for 1)
at org.jruby.RubyBasicObject.__send__(org/jruby/RubyBasicObject.java:1667)
at org.jruby.RubyKernel.send(org/jruby/RubyKernel.java:2060)
at RUBY.(root)(<script>:10)
which seems to suggest their is a private :warn method on Class with 1 argument?
Meanwhile, if I run the equivalent code as below
class Me
def method_missing(method_name, *args, &block)
puts "you have called: #{method_name}"
end
end
m = Me.new
m.public_send(:info)
m.public_send(:blah)
m.public_send(:warn)
against Ruby on the command-line, I get the following output with no errors:
you have called: info you have called: blah you have called: warn
The version of ruby installed on my system is:
ruby 1.9.3p194 (2012-04-20 revision 35410) [x86_64-darwin11.3.0]
Activity
Hi Hiro,
Thanks for the quick response, and for fixing up my formatting! 
Re: your comment: great point, thank you for that.
Unless I'm confused, there does appear to be something particular in my example about sending the message "warn", while sending the messages "info" and "blah" worked fine – since when I tried changing it to a send() message it reported an error about wrong number of arguments, which looked strange to me. Perhaps there's more than one issue here?
(In case its useful here's some context on how I came across this: I'm using the Ruby Dicom library, version 0.9.3. Its logging.rb uses the method_missing() to implement a proxy logger, and the read() method of d_object.rb uses public_send() to log. While experimenting I noticed that "debug" messages were logged fine, but an attempt to log a "warn" resulted in an exception.)
thanks again,
nick
Apologies, I appear to have screwed up the formatting quite badly, and don't have the permission to edit it.
If someone would like to fix, please go ahead.