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From Kristian Waagan <Kristian.Waa...@Sun.COM>
Subject Re: [jira] Commented: (DERBY-1471) Implement layer B streaming for new methods defined in JDBC4.0
Date Fri, 07 Jul 2006 14:40:34 GMT
TomohitoNakayama wrote:
> Hello.
> IMHO, I think java.lang.IndexOutOfBoundsException is better than 
> java.lang.OutOfMemoryError for this situation ...
> Error is too much for ...

Hi Tomohito,

Not sure I understand what you are referring to in your comment. I'll 
describe the situation I think you are talking about. Please correct me 
if I'm mistaken.

The OutOfMemoryError I have been talking about when reading LOBs with 
unknown length on the client side, is an exception thrown by the JVM 
when the LOB data cannot fit into the heap space. I did not plan to 
throw this error myself.

Further, if there is enough memory on the client to hold more than 2 GB 
of data, and the user passes in a stream with more than 2 GB of data 
available, I thought a SQLException would be in place:
22004.S.4=The length ({0}) exceeds the maximum length for the data type 
Not quite sure what to put into {{0}}, but maybe Integer._MAX_VALUE?

Are we on the same track here, or are you referring to another situation?


> Best regards.
> Kristian Waagan wrote:
>> John Embretsen wrote:
>>> Bryan Pendleton wrote:
>>>> > Kristian Waagan commented on DERBY-1471:
>>>> > ----------------------------------------
>>>> >
>>>> > The approach is to exhaust the application stream and copy it into
>>>> > memory to determine the length. If the data is too big to fit in
>>>> memory,
>>>> > the client will fail with an out-of-memory exception.
>>>> That seems fine to me. This is already the case with the current
>>>> API and implementation, I believe, so we aren't making anything worse.
>>> Hi Kristian and Bryan,
>>> I am assuming that there is no out-of-memory specific exception
>>> implemented in Derby, and that you by "out-of-memory exception" mean
>>> java.lang.OutOfMemoryError. Please give me a hint if my assumption is
>>> wrong...
>> Hello John,
>> There is no java.lang.OutOfMemoryException, but there is an
>> out-of-memory exception - the unchecked exception class
>> OutOfMemoryError, which is also referred to as an error class!
>> I'll follow your advice and use the term out-of-memory error, which is
>> much more precise :)
>>> I believe it is important to distinguish between java Errors and
>>> Exceptions, since an Error "indicates serious problems that a reasonable
>>> application should not try to catch" [1].
>> I agree.
>> According to the "The Java Language Specification, Third Edition", the
>> reason why errors are not checked exceptions is "... they can occur at
>> many points in the program and recovery from them is difficult or
>> impossible. A program declaring such exceptions would be cluttered,
>> pointlessly."*.
>> Cheers,

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