This is related to the performance issues discussed in the thread
"Performance with many small requests".
When I reworked my servlet to synchronize only on pieces that needed to
be synchronized, rather than on the entire request processing routine, I
am now throwing an exception when parsing a string into a java.util.Date
variable. It only happens occasionally, maybe once every few dozen to a
hundred or so requests, and I can't figure out why it doesn't work all
the time.
Declared at the class level, I have:
private static final SimpleDateFormat sdfFullDateTime = new
SimpleDateFormat( "yyyy-MM-dd HH:mm:ss" );
Then in the request processing method, I have
dateTimeStr = dateStr + " " + timeStr;
try {
dataDate = sdfFullDateTime.parse( dateTimeStr );
} catch ( Exception e ) {
writeLog( "Unable to parse dataTime string: '", dateTimeStr +
"': " + e );
}
(the try/catch is there only for debugging this issue), and in the log
I'm seeing:
2009-05-11 09:19:54: Unable to parse dateTime string: ': '2009-05-11
09:19:37': java.lang.NumberFormatException: For input string: ""'
Which I don't understand at all; dateDate (java.util.Date), dateStr
(String), timeStr (String) and dateTimeStr (String) are all declared in
the processing method, NOT at the class level.
Maybe I should move the declaration of the SimpleDateFormat into the
processing method? Or synchronize the date parse?
I'm kind of lost here; any help appreciated!!
Dave
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