On Windows this is located in %APPDATA%\Subversion\auth. On Linux and OSX it is located in ~/.subversion/auth. Just find and delete the file with the cached information.
http://www.techcrony.info/2008/03/26/admin/how-to-change-eclipse-svn-password/#sthash.cgshawy7.dpuf
rm -rf auth
Refer : http://polycaster.blogspot.in/2009/12/change-svn-password-in-eclipse.html
ArrayOutOfBound 