[XGC-13] Thread Safety Problem with FOP 0.93

• Type: Bug
• Status: Resolved
• Resolution: Fixed
• Affects Version/s: 2.6
• Component/s: xmp
• Environment: Operating System: Windows XP; Platform: PC
• Assignee: XML Graphics Project Mailing List
• Reporter: Jean-Claude Rouvinez
• Created: 28/Apr/08 01:52
• Updated: 24/Jun/15 08:50
• Resolved: 18/Jun/08 07:10

Description

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