I found it helpful to review pages 98 & 99 for refreshing my mind with what is going on in the entity bean architecture and how it differs from session beans.
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Notice on 279, the second-from-last star bullet that home business methods can NOT throw RuntimeExceptions. From what I remember in the other
Java tests I've taken, I'd expect to see a question that has a home business method throw UnsupportedOperationException, ClassCastException, or some other exception that isn't blatantly obvious at first glance as a RuntimeException.
Direct known subclasses of RuntimeException (from api javadoc):
ArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException,
IllegalStateException, ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException