Persist the {@link com.darkhonor.rage.model.Course} to the data source.All {@link com.darkhonor.rage.model.Instructor}, {@link com.darkhonor.rage.model.Student}, and {@link com.darkhonor.rage.model.Section} subelements will be persistedat the same time. If the Course exists in the data source and IllegalStateException will be thrown.
@return true if the Course is saved successfully, falseotherwise.
@throws IllegalStateException If the EntityManager is closed or theCourse already exists in the data source
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