Saves the provided GradedEvent to the data source. This method assumes the Question, TestCase, and Course objects contained in this GradedEvent have all previously been saved to the data source and contain valid Id values.
@param gradedEvent The GradedEvent to save to the data source
@throws IllegalStateException Thrown when the EntityManager is closed
@throws NullPointerException Thrown when the EntityManager or GradedEvent isnull
@throws IllegalArgumentException Thrown when the GradedEvent exists in thedata source return The Id of the created GradedEvent object
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