public interface ItemReader<T>
read() returning a different value
and finally returning
null when all input data is exhausted.
need to be aware that this is the case.
T read() throws Exception, UnexpectedInputException, ParseException, NonTransientResourceException
null at the end of the input
data set. In a transactional setting, caller might get the same item
twice from successive calls (or otherwise), if the first call was in a
transaction that rolled back.
ParseException - if there is a problem parsing the current record
(but the next one may still be valid)
NonTransientResourceException - if there is a fatal exception in
the underlying resource. After throwing this exception implementations
should endeavour to return null from subsequent calls to read.
UnexpectedInputException - if there is an uncategorised problem
with the input data. Assume potentially transient, so subsequent calls to
read might succeed.
Exception - if an there is a non-specific error.
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