lib/state_machine/transition.rb in state_machine-1.0.3 vs lib/state_machine/transition.rb in state_machine-1.1.0

@@ -13,12 +13,15 @@
     def initialize(object, machine, event) #:nodoc:
       @machine = machine
       @from_state = machine.states.match!(object)
       @from = machine.read(object, :state)
       @event = machine.events.fetch(event)
+      errors = machine.errors_for(object)
       
-      super(object, "Cannot transition #{machine.name} via :#{self.event} from #{from_name.inspect}")
+      message = "Cannot transition #{machine.name} via :#{self.event} from #{from_name.inspect}"
+      message << " (Reason(s): #{errors})" unless errors.empty?
+      super(object, message)
     end
     
     # The event that triggered the failed transition
     def event
       @event.name
@@ -349,9 +352,11 @@
       
       # Pauses the current callback execution.  This should only occur within
       # around callbacks when the remainder of the callback will be executed at
       # a later point in time.
       def pause
+        raise ArgumentError, 'around_transition callbacks cannot be called in multiple execution contexts in java implementations of Ruby. Use before/after_transitions instead.' if RUBY_PLATFORM == 'java'
+        
         unless @resume_block
           require 'continuation' unless defined?(callcc)
           callcc do |block|
             @paused_block = block
             throw :halt, true