DO NOT REPLY [Bug 32311] New: - Performance: fmt:formatDate regarding calls to Calendar.getInstance

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http://issues.apache.org/bugzilla/show_bug.cgi?id=32311

           Summary: Performance: fmt:formatDate regarding calls to
                    Calendar.getInstance
           Product: Taglibs
           Version: 1.0.4
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Standard Taglib
        AssignedTo: taglibs-dev@jakarta.apache.org
        ReportedBy: nijlunsing_h@schiphol.nl


When loadtesting our site with 10 users to a page which makes a lot of use of
the fmt:formatdate, the hits / seconds drop and fluctuate tremondously between 5
hits / sec and 20 hits per sec.
With 1 or 2 users the hits per second maintain constantly at 20 hits / sec.
Using Weblogic 6.1 SP4, with 15 (default) execute threads, memory / garbage
collection is not a problem.
After creating threaddumps is appears that almost all threads have these
stacktraces on the top: 
       at java.util.Calendar.getInstance(Calendar.java:829)
       at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:326)
       at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:317)
       at java.text.DateFormat.get(DateFormat.java:645)
       at java.text.DateFormat.getTimeInstance(DateFormat.java:411)
       at
org.apache.taglibs.standard.tag.common.fmt.FormatDateSupport.createFormatter(FormatDateSupport.java:223)
       at
org.apache.taglibs.standard.tag.common.fmt.FormatDateSupport.doEndTag(FormatDateSupport.java:155)

And are all "waiting on monitor XXXXX", it seems these calls are blocking each
other, possible due to the fact that getInstance is synchronized?

Other pages which are not using this tag are not a problem.

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