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Memory and InstantDB


I am developing an application which receives XML input taht is parsed and
stored in an InstantDB database.  The input is parsed as it is received and
then sends the objects created to a separate (high priority) thread which
stores them in the database.  The expected concurrency definitely occurs and
the objects, once stored in InstantDB are being gc'ed.

However, I am getting OutOfMemory errors with an input file as small as 1.5
MB.  This occurs when using Blackdown's JDK 1.1.7 v3 on an i386 with Redhat
Linux 6.0 and 128 MB of RAM.  When I use the new JDK 1.2.2 the problem does not
occur

The output  from the trace log seems to indicate that there should be plenty of
memory still available - here it is with the minimum heap size set to 8 MB and
the maximum at default (16MB):

 main Total Memory=8388600 Free=7601136 Used 786424
main Total Memory=8388600 Free=7593208 Used 795392
main Total Memory=8388600 Free=7524784 Used 863816
main Total Memory=8388600 Free=7449336 Used 938224
main Total Memory=8388600 Free=7402864 Used 985736
main Total Memory=8388600 Free=7314888 Used 1073712
main Total Memory=8388600 Free=7256736 Used 1131864
main Total Memory=8388600 Free=7208424 Used 1180176
main Total Memory=8388600 Free=7075840 Used 1311720
main Total Memory=8388600 Free=6830176 Used 1558088
main Total Memory=8388600 Free=6780672 Used 1607928
main Total Memory=8388600 Free=6690464 Used 1698136
main Total Memory=8388600 Free=6570168 Used 1818432
main Total Memory=8388600 Free=6431360 Used 1957240
main Total Memory=8388600 Free=7160120 Used 1228144
main Total Memory=8388600 Free=7104656 Used 1283944
main Total Memory=8388600 Free=7049160 Used 1338400
main Total Memory=8388600 Free=6993664 Used 1394936
outputThread java.lang.OutOfMemoryError: 


Anyone have any idea why this might occur?  If I turn of database storage then
the file is read through with no problems.  I've carefully reviewed my code to
make sure all ResultSets and Statements are closed and System.gc is called.


 -- 
Rich Coad
Tech Team
iSyndicate.com
(415) 430-2369
Te audire no possum. Musa sapientum fixa est in aure.
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