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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 44887] New: Thread Safety Problem with FOP 0.93
Date Mon, 28 Apr 2008 08:52:42 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=44887

           Summary: Thread Safety Problem with FOP 0.93
           Product: XMLGraphicsCommons
           Version: Trunk
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XMP
        AssignedTo: general@xmlgraphics.apache.org
        ReportedBy: jcrouvi@yahoo.com


Hi,

We use the version 0.93 of FOP.
When this library is used in a Multi Threaded environment, we receive the
following error message:

         java.lang.Thread.run(Thread.java:595)
            Caused by: <java.lang.NumberFormatException: For input string:
"E444444411E411EEEEEE1">
           
sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1224)
            java.lang.Double.parseDouble(Double.java:482)
            java.text.DigitList.getDouble(DigitList.java:141)
            java.text.DecimalFormat.parse(DecimalFormat.java:1276)
            java.text.SimpleDateFormat.subParse(SimpleDateFormat.java:1375)
            java.text.SimpleDateFormat.parse(SimpleDateFormat.java:1124)
            java.text.DateFormat.parse(DateFormat.java:333)
           
org.apache.xmlgraphics.xmp.XMPSchemaAdapter.parseISO8601Date(XMPSchemaAdapter.java:189)

The reason is the use of a DateFormat as static class variable:
http://svn.apache.org/viewvc/xmlgraphics/commons/tags/commons-1_1/src/java/org/apache/xmlgraphics/xmp/XMPSchemaAdapter.java?view=markup

The JAVA DateFormat classes are not at all thread safe. This is written in the
API description: <Date formats are not synchronized>.

On your site
http://xmlgraphics.apache.org/fop/0.94/embedding.html#multithreading
you write:
 <If you encounter any suspicious behaviour, please notify us.>

I hope that the notification of this problem will help you.

Best Regards
Jean-Claude


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