Weird NPE when ObjectSpace._id2ref called for GC'ed object in conditional
statement
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Key: JRUBY-1125
URL: http://jira.codehaus.org/browse/JRUBY-1125
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.0.0
Reporter: Bill Dortch
This is a really strange one. The source of Cheri's (CJX) NPE's, BTW, but easy
enough to work around.
{code}
>> # make an object
?> x = 'xxx'
=> "xxx"
>> # remember its id
?> x.object_id
=> 6
>> ObjectSpace._id2ref 6
=> "xxx"
>> # now kill it good and dead
?> x = nil
=> nil
>> GC.start
=> nil
>> # see if ObjectSpace finds it
?> ObjectSpace._id2ref 6
=> nil
>> # now try it in a conditional
?> if ObjectSpace._id2ref 6
>> end
NativeException: java.lang.NullPointerException: null
from EvaluationState.java:272:in
`org.jruby.evaluator.EvaluationState.evalInternal'
from EvaluationState.java:1609:in
`org.jruby.evaluator.EvaluationState.rootNode'
from EvaluationState.java:356:in
`org.jruby.evaluator.EvaluationState.evalInternal'
from EvaluationState.java:164:in
`org.jruby.evaluator.EvaluationState.eval'
from RubyObject.java:888:in `org.jruby.RubyObject.evalWithBinding'
from RubyKernel.java:755:in `org.jruby.RubyKernel.eval'
from null:-1:in `org.jruby.RubyKernelInvokerSevalxx1.call'
from InvocationCallback.java:49:in
`org.jruby.runtime.callback.InvocationCallback.execute'
from FullFunctionCallbackMethod.java:78:in
`org.jruby.internal.runtime.methods.FullFunctionC
allbackMethod.internalCall'
from DynamicMethod.java:79:in
`org.jruby.internal.runtime.methods.DynamicMethod.call'
from EvaluationState.java:1023:in
`org.jruby.evaluator.EvaluationState.fCallNode'
from EvaluationState.java:253:in
`org.jruby.evaluator.EvaluationState.evalInternal'
from EvaluationState.java:164:in
`org.jruby.evaluator.EvaluationState.eval'
from DefaultMethod.java:136:in
`org.jruby.internal.runtime.methods.DefaultMethod.internalCal
l'
from DynamicMethod.java:79:in
`org.jruby.internal.runtime.methods.DynamicMethod.call'
from EvaluationState.java:568:in
`org.jruby.evaluator.EvaluationState.callNode'
... 95 levels...
from Ruby.java:319:in `org.jruby.Ruby.compileOrFallbackAndRun'
from Main.java:228:in `org.jruby.Main.runInterpreter'
from Main.java:173:in `org.jruby.Main.runInterpreter'
from Main.java:120:in `org.jruby.Main.run'
from Main.java:95:in `org.jruby.Main.main'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:150:in `eval_input'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:70:in `signal_status'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:189:in `eval_input'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:70:in
`each_top_level_statement'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:190:in `loop'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:190:in `catch'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:190:in `eval_input'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:70:in `start'
from :-1:in `catch'
from C:/jruby/jruby-1.0.0/lib/ruby/1.8/irb.rb:71:in `start'
from :-1>>
{code}
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