I am troubled by two strange bug.

gistfile1.txt

I am troubled by two strange Error.

1) ArgumentError occurs when I call ActiveRecord::Base.save
2) NoMethodError occurs when I call the has_many asociations.
  (using act_as_tree plugin)

These exceptions do not usually occur. These exceptions rarely occurs.
It is not made to reappear in my environment.

If a known problem in JRuby or similar problem, will you teach it?

[detail]
- ActiveRecord: 2.2.0
- JRuby: 1.4.0
- JRuby option: -J-Xmx3072m -J-Djruby.compile.mode=OFF
- Multi-threading environment


[1) backtrace]
ArgumentError (wrong # ofarguments(0 for 1)):
["/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:368:in `method_missing'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/base.rb:2003:in `with_scope'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:202:in `with_scope'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:366:in `method_missing'",
"/home/sample/rails/vendor/plugins/will_paginate/lib/will_paginate/finder.rb:164:in `method_missing_with_paginate'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations.rb:1356:in `validate_associated_records_for_children'",
"/home/sample/rails/vendor/rails/activesupport/lib/active_support/callbacks.rb:178:in `evaluate_method'",
"/home/sample/rails/vendor/rails/activesupport/lib/active_support/callbacks.rb:166:in `call'",
"/home/sample/rails/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `run'",
"/home/sample/rails/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `each'",
"/home/sample/rails/vendor/rails/activesupport/lib/active_support/callbacks.rb:90:in `run'",
"/home/sample/rails/vendor/rails/activesupport/lib/active_support/callbacks.rb:277:in `run_callbacks'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/validations.rb:1029:in `valid?'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/callbacks.rb:286:in `valid_with_callbacks?'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/validations.rb:1018:in `save_with_validation!'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/dirty.rb:87:in `save_with_dirty!'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/transactions.rb:150:in `save_with_transactions!'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb:66:in
`transaction'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/transactions.rb:129:in `transaction'",
"/home/sample/rails/vendor/plugins/deadlock_retry/lib/deadlock_retry.rb:49:in
`transaction_with_deadlock_handling'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/transactions.rb:138:in `transaction'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/transactions.rb:150:in `save_with_transactions!'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/transactions.rb:158:in `rollback_active_record_state!'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/transactions.rb:150:in `save_with_transactions!'",
"/home/sample/rails/app/models/book:84:in `update_person'",

app/models/book.rb is following.

def update_person(a)
 Book.transaction do
   self.reload
   self.person = a
   save!
 end
end


[2) backtrace]

NoMethodError (undefined method `each' for #<Class:0x1494355>):
["/home/sample/rails/vendor/rails/activerecord/lib/active_record/base.rb:1833:in `method_missing'",
"/home/sample/rails/vendor/plugins/will_paginate/lib/will_paginate/finder.rb:164:in `method_missing_with_paginate'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:368:in `method_missing'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/base.rb:2003:in `with_scope'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations/association_proxy.rb:202:in `with_scope'",
"/home/sample/rails/vendor/rails/activerecord/lib/active_record/associations/association_collection.rb:366:in `method_missing'",
"/home/sample/rails/vendor/plugins/will_paginate/lib/will_paginate/finder.rb:164:in `method_missing_with_paginate'",
"/home/sample/rails/app/models/old_book.rb:10:in `foo'",

app/models/big_book.rb is following.

class OldBook < ActiveRecord::Base
 acts_as_tree  :order => "id"

 def foo
   self.children.each do |b|
     puts b
   end
 end
end


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