Incompatible behavior of javax.xml.parsers.SAXParser between JDK5 and 6

A customer finds out different behavior in SAXParser between JDK5 and JDK6.
A program executes javax.xml.parsers.SAXParser.parse(File, DefaultHandler)
and tries to delete a specified file as parameter in java.io.File.delete().
Then, the program can delete the file in JDK5 but not in JDK6(and JDK7).

CONFIGURATION:
JDK : JDK5u30/JDK6u26/JDK7b143
OS: WindowsXP(SP3, Japanese)

REPRODUCE:
1. Compile the attached Test.java
2. Create a file
   (In this report, "a.txt" is created.)
3. Launch "java Test a.txt" in JDK5u30
  (size of a.txt is 0.)

  Program can delete a.txt with the following message.
----
F:\licensees\diff-behavior-in-SAXParser>java -showversion Test a.txt
java version "1.5.0_30"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_30-b02)
Java HotSpot(TM) Client VM (build 1.5.0_30-b02, mixed mode)

SAXException: Premature end of file.
Delete: OK
-----

4. Create a.txt and launch "java Test a.txt" in JDK6u25

  The test program do not delete a.txt.
----
F:\licensees\diff-behavior-in-SAXParser>java -showversion Test a.txt
 java version "1.6.0_26"
 Java(TM) SE Runtime Environment (build 1.6.0_26-b03)
 Java HotSpot(TM) Client VM (build 20.1-b02, mixed mode)
  
 SAXException: Premature end of file.
 Delete: NG
----