CLONE -Memory Leak when extending Java class with additional Ruby instance
variable
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Key: JRUBY-4841
URL: http://jira.codehaus.org/browse/JRUBY-4841
Project: JRuby
Issue Type: Bug
Components: Java Integration
Affects Versions: JRuby 1.5
Environment: java version "1.6.0_20"
Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-10M3065)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01-279, mixed mode)
jruby 1.5.0 (ruby 1.8.7 patchlevel 249) (2010-05-12 6769999) (Java HotSpot(TM)
64-Bit Server VM 1.6.0_20) [x86_64-java]
Reporter: Tobias Vogele
Assignee: Charles Oliver Nutter
Priority: Critical
Fix For: JRuby 1.5.1
When a Ruby class extends a Java class and has additional Ruby instance
variables, it is not garbage collected.
Here some code to reproduce:
{code:ruby}
class RubySubClass < Java::JavaLang::Object
attr_accessor :javaObj
end
(0..50).each do |i|
list = Java::JavaUtil::ArrayList.new
list.add Java::JavaUtil::ArrayList.new(10000000)
rs = RubySubClass.new
list.add rs
rs.javaObj = list
java.lang.System.gc
java.lang.Thread.sleep(200)
puts "#{i}"
end
{code}
On my machine this fails after the 4th iteration with:
java.lang.OutOfMemoryError: Java heap space (NativeException), but the exact
number of iterations of course depends on the heap size, 32/64 bit etc.
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