[Geotiff] !!help how to create tiff image with extra tags using JAI?

[Kanika Jain]

i want to create a TIFF image with some extra tags. I am using JAI (Java
Advanced Imaging) for this. i want to make the tiff image with 15 new tags.
the code that i have written it successfully makes the tiff image with 9
tags but not working with 15 tags. the code doesn't gives any compile time
or run time Exception, but when i try to read this new tiff file then for 6
tags (out off 15) it throws Null Pointer Exception indicating that no such
tag exist.
Can anyone give me some sample code showing how can extra tags be added
while creating a tiff image.
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