#9 Concurrency bottleneck in ActionBase

[Gautam Jolly]

Struts has implemented a singleton pattern for each
Action class. But we set instance variables in the Action
class. This leads to concurrency problems when multiple
submissions are made to an Action class

[Gautam Jolly]

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Fixed the ActionBase class such that a new instance of the
Action class is created in the perform() method, which is
then used for event handling.