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Ubuntu 16.10, amd64. Using svn 1.9.4 to check out a local working copy of a netbeans project. Accessing subversion history via svn+ssh:// and svnkit (set as preferred) from inside netbeans only works when entering the private key file and passphrase. SSH_AUTH_SOCK env var gets set at login by the gnome session startup as far as I understand it bec I selected "unlock at login". Command line access via ssh agent is working. Netbeans was started from the same terminal and SSH_AUTH_SOCK was set.
I just tried their svnkit 1.8.14 cli and it did not work either. Then I did it myself and it works. See test.java for an example.
Created attachment 162574 [details] working svnkit ssh-agent example