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Home » Newcomers » Newcomers » can't install eclipse if mse(antivirus) is on(can't install eclipse if microsoft security essential realtime protection is on)
can't install eclipse if mse(antivirus) is on [message #1819027] Sun, 05 January 2020 15:05 Go to next message
yoga sadana is currently offline yoga sadanaFriend
Messages: 1
Registered: January 2020
Junior Member
im just curious why it can't install, if microsoft security essential (antivirus) realtime protection is turned on,

its works perfectly, installing, if i turn that off

im using this version :

Eclipse Installer 2019-12 R

download from
Main Download Site
Canada - Main downloads area
Re: can't install eclipse if mse(antivirus) is on [message #1819037 is a reply to message #1819027] Mon, 06 January 2020 06:21 Go to previous message
Ed Merks is currently offline Ed MerksFriend
Messages: 31159
Registered: July 2009
Senior Member
On Windows, antivirus tools can and often do "bad things". In particular, they will open a newly created file and lock it while scanning that file. This prevents the software using that file from writing to that file again and from removing/renaming that file, typically with "Permission is denied" exceptions, making it appear as if like the user does not have access rights to their own files.

Windows Defender also causes performance problems because scanning is done repeatedly, e.g., each time you launch Eclipse apparently all the jars are scanned:

This is why it's recommended to exclude the folder of the Eclipse installation from being scanned in the comment above. In general excluding the folder's <home>/.eclipse (where shared information is stored) ,<home>/.p2 (where the installer's shared bundle pool is managed), and the folder <home>/eclipse (where the installer creates all the installations by default), and the workspace folders will prevent such locking/access problems and will improve performance.
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