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Transfer File from Android to server via socket

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Currently, I've created one android apps to enables to send/transfer file from internal storage to remote server via WAN when I stayed in outside.

All files is success transfer but at the end my server is ended up with this message, ( the picture/music files will be success rendered when I quit out this programs )

Exception in thread "main" java.lang.IllegalArgumentException: Illegal Capacity: -1
at java.util.ArrayList.<init>(Unknown Source)

Here is my server side code,

Server :

Android Side

My problem is here how can I modify to server side code to avoid this problems on future. Appreciate to any helps and thanks.
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The stack trace line number and the one from your code do not match. Line number 60 on is '{'

Are you sure the information is accurate ?
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