Problem talking to processes. JRuby's read hangs.
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Key: JRUBY-1304
URL: http://jira.codehaus.org/browse/JRUBY-1304
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.0.0
Environment: Tested on OSX/Intel (JDK 1.5) and Windows (JDK 1.6)
Reporter: Mariano Kamp
>From my email
>(http://www.nabble.com/Problem-when-talking-to-processes--tf4354724.html#a12408771):
Hi,
I am currently trying to make a rails application run on JRuby.
Most of my problems have vanished by now (using an http-proxy and
Windows really is a lot harder than OSX), but talking to processes
doesn't work all that well for me, or to be more specific to the
graphviz library by using pipes.
I extracted the problem to get a small sample. Calling grep,
passing in some lines via stdin and the reading stdout:
source = <<-DOC
one
two
three
four
five
DOC
puts "Now calling grep"
output = IO.popen('grep e', 'r+') do |process|
process.puts source
process.close_write
process.read
end
puts "And we're back: #{output}"
This works fine with Ruby but hangs JRuby.
localhost:~ mkamp$ uname -a
Darwin localhost 8.10.1 Darwin Kernel Version 8.10.1: Wed May 23
16:33:00 PDT 2007; root:xnu-792.22.5~1/RELEASE_I386 i386 i386
localhost:~ mkamp$ ruby -v
ruby 1.8.5 (2006-08-25) [i686-darwin8.8.3]
localhost:~ mkamp$ jruby -v
ruby 1.8.5 (2007-08-13 rev 3876) [i386-jruby1.1]
localhost:~ mkamp$ java -version
java version "1.5.0_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-164)
Java HotSpot(TM) Client VM (build 1.5.0_07-87, mixed mode, sharing)
localhost:~ mkamp$ ruby talking_to_processes.rb
Now calling grep
And we're back: one
three
five
localhost:~ mkamp$ jruby talking_to_processes.rb
Now calling grep
JRuby hangs at "process.read" ...
Any idea why that is? Should I report a bug? I didn't find a
relevant open one in Core Classes/Modules. http://jira.codehaus.org/
browse/JRUBY-1049
is the closest I've seen, but I don't get "NoMethodError".
I am running JRuby from the trunk. This behavior can be seen on
OSX and Windows.
Cheers,
Mariano
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