java.util.ConcurrentModificationException still occurs
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                 Key: JRUBY-5651
                 URL: http://jira.codehaus.org/browse/JRUBY-5651
             Project: JRuby
          Issue Type: Bug
          Components: Core Classes/Modules
            Reporter: Olaf Sammler
            Assignee: Charles Oliver Nutter


While creating some clean Ruby instances in a Timer through Ruby.newInstance(), 
I get randomly this exception:

[#|2008-04-14T17:16:50.866+0200|WARNING|sun-appserver9.1|javax.enterprise.system.stream.err|_ThreadID=19;_ThreadName=Timer-6;_RequestID=fd1a3bbc-2afe-4c1e-9e4e-cfefeaa1d664;|java.util.ConcurrentModificationException
        at java.util.Hashtable$Enumerator.next(Hashtable.java:1020)
        at 
org.jruby.environment.OSEnvironment.getAsMapOfRubyStrings(OSEnvironment.java:144)
        at 
org.jruby.environment.OSEnvironment.getSystemPropertiesMap(OSEnvironment.java:120)
        at org.jruby.RubyGlobal.defineGlobalEnvConstants(RubyGlobal.java:255)
        at org.jruby.RubyGlobal.createGlobals(RubyGlobal.java:212)
        at org.jruby.Ruby.init(Ruby.java:833)
        at org.jruby.Ruby.newInstance(Ruby.java:157)
        at org.jruby.Ruby.newInstance(Ruby.java:145)
        at 
com.unient.engine.core.runtime.cache.RubyRuntimeCache$RubyRuntimeCreatorTask.run(RubyRuntimeCache.java:602)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)

The problem is in iteration of System properties entrySet. Iteration on this 
entrySet is not threadsafe, since any other apllication can be writing to 
system properties at the same time.


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