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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 46982] New: AccessLogValve reports correct time but incorrect offset following Spring DST transition.
Date Tue, 07 Apr 2009 14:32:58 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=46982

           Summary: AccessLogValve reports correct time but incorrect
                    offset following Spring DST transition.
           Product: Tomcat 5
           Version: 5.5.27
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Catalina
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: phil.pickett@springsource.com


This is a problem with AccessLogValve for tc5.5 as well as tc6.0 on all
platforms.

With the system clock on my linux machine (Ubuntu in my case) to just before
the US time change on March 8, I started Tomcat 5.5 and see the following
messages in my Tomcat access log after accessing Tomcat JSP example pages at
the time of DST transition:

-: - [08/Mar/2009:01:56:20 -0700] GET /jsp-examples/jsp2/simpletag/book.jsp
HTTP/1.1 200 1738 1 - {http-8080-Processor24}
-: - [08/Mar/2009:03:01:22 -0700] GET /jsp-examples/jsp2/tagfiles/hello.jsp
HTTP/1.1 200 2213 68 - {http-8080-Processor25}

Note the offset of "-0700" both before and after DST transition.  Following a
Tomcat restart the offset is correct:

-: - [08/Mar/2009:03:19:42 -0600] GET /jsp-examples/jsp2/jspx/basic.jspx
HTTP/1.1 200 1919 780 - {http-8080-Processor25}
-: - [08/Mar/2009:03:19:59 -0600] GET /jsp-examples/jsp2/jspx/svgexample.html
HTTP/1.1 200 2239 4 - {http-8080-Processor25}
-: - [08/Mar/2009:03:19:59 -0600] GET /jsp-examples/jsp2/jspx/textRotate.jpg
HTTP/1.1 200 26729 3 - {http-8080-Processor25}


BTW, I ran the tzupdater before my tests:

linwin01-512> java -jar tzupdater.jar -V
tzupdater version 1.3.12-b01
JRE time zone data version: tzdata2009a
Embedded time zone data version: tzdata2009a



The problem is in the org.apache.catalina.valves.AccessLogValve which contains
the following in its start method:


// Initialize the timeZone, Date formatters, and currentDate
timezone = TimeZone.getDefault();
timeZoneNoDST = calculateTimeZoneOffset(timezone.getRawOffset());
Calendar calendar = Calendar.getInstance(timezone);
int offset = calendar.get(Calendar.DST_OFFSET);
timeZoneDST = calculateTimeZoneOffset(timezone.getRawOffset()+offset);


Based on what I’ve seen, “int offset = calendar.get(Calendar.DST_OFFSET);”
returns 0 when the current time is not in Daylight savings time and (for my
timezone) 3600000 (60 * 60 * 1000) when the current time is in Daylight
Savings.  It looks like the code assumes this is always the offset for Daylight
Savings for the current timezone.  I have no idea if there are some
locations/timezones where Daylight Savings Time does not have a 1 hour offset.

Because of this, if in a non-DST time period, timeZoneDST and timeZoneNoDST are
set to the same value.  If in a DST time period, I believe they are set
correctly so that the transition in Autumn works correctly.  I think the only
problem is when moving ahead in Springtime (unless the software has been
running for 6 months or so which caused the offset to be set correctly).

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