The following navigation, activation and selection keyboard bindings on JTree need verification for proper operation and key binding sequences.

JTree
Navigate in - Tab
Navigate out - Tab, Shift+Tab (reverses direction)
Expand hierarchy - R Arrow Key
Contract hierarchy - L Arrow Key
Navigate within -
U/D Arrow = Move focus up/down one tree element
home = move focus to first element in tree, view is
changed to show first element
end = move focus to first element in tree, view is
changed to show first element
PgUp, PgDn = Move up/down one JViewport view, first
focusable element in view gets focus
Ctrl+page down = move right one JViewport view, first
focusable component in view gets focus
Ctrl+page up = move left one JViewport view, first
focusable component in view gets focus
Selection (assumes selection is supported) -
Ctrl+A, Ctrl+/ = Select all
Ctrl+\ = De-select all
Ctrl+Spacebar = discontiguous selection
Shift+spacebar = contiguous selection
Shift+down = extend selection down
Shift+up = extend selection up
Shift+home = extend selection to beginning of data
Shift+end = extend selection to end of data
Shift+page down = extend selection down one view
Shift+page up = extend selection up one view
Ctrl+Shift+page down = extend selection right one view
Ctrl+Shift+page up = extend selection left one view