j2sdk1.4.2 build 12 :
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In win 2k , Xp and 98 Filechannel.force(true) throws "Access is denied " exception if the FileChannel is created from FileInputStream but in case of solaris 8 , solaris 10 and linux RH7.1 , no such exception is thrown. The testcase FCtransferFrom.java is attached.

Output in Win2k:
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$ java -version
java version "1.4.2-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-beta-b12)

Java HotSpot(TM) Client VM (build 1.4.2-beta-b12, mixed mode)
$ javac FCtransferFrom.java
$ java FCtransferFrom
--1-- fc1.position=0, fc1.size=1083
--2-- fc2.position=0, fc2.size=0
--3-- fc2.position=0, fc2.size=1083
EXPECTED EXCEPTION java.io.IOException: Access is denied

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Output in solaris and linux :
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aparna:/net/sqindia/export/disk03/coresqe/Aparna/verify 14 % !java
java FCtransferFrom
--1-- fc1.position=0, fc1.size=6725
--2-- fc2.position=0, fc2.size=0
--3-- fc2.position=0, fc2.size=6725
--4--
--5--

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