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JRuby script engine mucks with parent globals #2239

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byteit101 opened this issue Nov 24, 2014 · 2 comments
Closed

JRuby script engine mucks with parent globals #2239

byteit101 opened this issue Nov 24, 2014 · 2 comments
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JRuby 1.7.x
Milestone
Won't Fix

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@byteit101
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When in a ruby context, creating a new ScriptEngineManager and getting the jruby engine from it resets enclosing context's globals to nil, as does setting new bindings:

# using IRB jruby-1.7.16
sem = Java.javax.script.ScriptEngineManager.new
# => #<Java::JavaxScript::ScriptEngineManager:0x5bb21b69> 
$FOO
# => nil 
$FOO = "1"
# => "1" 
jr = sem.getEngineByName("jruby")
# => #<Java::OrgJrubyEmbedJsr223::JRubyEngine:0x7ce6a65d> 
jr.eval("$FOO")
# => "1" 
$FOO
# => nil # What? it stole the global!
$FOO = "2"
# => "2" 
jr.eval("$FOO")
# => "1" 
jr.setBindings(sem.getBindings, javax.script.ScriptContext.ENGINE_SCOPE)
# => nil 
jr.eval("$FOO")
# => "1" 
$FOO
# => nil # What? It reset the global!
$FOO = "3"
# => "3" 
$FOO
# => "3" 
jr.eval("$FOO")
# => "1"
@yatsura
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yatsura commented Dec 28, 2014

Have confirmed this happens under 1.7.18 and 1.7.11 too. Interestingly, this also happens for any global variable:

sem = Java.javax.script.ScriptEngineManager.new
# => #<Java::JavaxScript::ScriptEngineManager:0x23cdfde8>
$FOO
# => nil
$FOO = "1"
# => "1"
jr = sem.getEngineByName("jruby")
#  => #<Java::OrgJrubyEmbedJsr223::JRubyEngine:0x401845d4>
jr.eval("$FOO")
#  => "1"
$FOO
# => nil
$BAR = "2"
# => "2"
jr.eval("$FOO") # Really access foo again
# => "1"
$BAR
# => nil

@kares
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kares commented Mar 2, 2018

this will resolve with 91278e7 (in JRuby 9.2)
... for previous versions its a known limitation esp. for JRuby 1.7.x which is now considered dead

@kares kares closed this as completed Mar 2, 2018
@kares kares added this to the Won't Fix milestone Mar 2, 2018
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Labels
JRuby 1.7.x
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@rtyler @kares @byteit101 @yatsura