Config to make Eclipse Juno icons and tabs look small and nice in Linux

.gtkrc-eclipse

# Create a new file in your home directory called .gtkrc-eclipse

# call eclipse with this command:
# Gtk2 forced:
# export SWT_GTK3=0
# env GTK2_RC_FILES=/usr/share/themes/<YourTheme>/gtk-2.0/gtkrc:/home/<YourUser>/.gtkrc-eclipse '/path_to_eclipse/eclipse'

# In your Eclipse directory find the file 'e4_default_gtk.css'
# In this file there's a CSS class:

# .MPartStack {
#     font-size: 11;
#     swt-simple: false;
#     swt-mru-visible: false;
# }

# And you have two possible solutions:

# 1. Change font-size to something smaller
# 2. Just comment out or remove font-size from this class (works well for me)

# http://stackoverflow.com/questions/11805784/very-large-tabs-in-eclipse-panes-on-ubuntu

# .gtkrc-eclipse

style "gtkcompact" {
    GtkButton::default_border={0,0,0,0}
    GtkButton::default_outside_border={0,0,0,0}
    GtkButtonBox::child_min_width=0
    GtkButtonBox::child_min_heigth=0
    GtkButtonBox::child_internal_pad_x=0
    GtkButtonBox::child_internal_pad_y=0
    GtkMenu::vertical-padding=1
    GtkMenuBar::internal_padding=0
    GtkMenuItem::horizontal_padding=4
    GtkToolbar::internal-padding=0
    GtkToolbar::space-size=0
    GtkOptionMenu::indicator_size=0
    GtkOptionMenu::indicator_spacing=0
    GtkPaned::handle_size=4
    GtkRange::trough_border=0
    GtkRange::stepper_spacing=0
    GtkScale::value_spacing=0
    GtkScrolledWindow::scrollbar_spacing=0
    GtkTreeView::vertical-separator=0
    GtkTreeView::horizontal-separator=0
    GtkTreeView::fixed-height-mode=TRUE
    GtkWidget::focus_padding=0
}
class "GtkWidget" style "gtkcompact"

# Make tabs smaller

style "compact-toolbar" {
    GtkToolbar::internal-padding = 0
    xthickness = 1
    ythickness = 1
}

style "compact-button" {
    xthickness = 0
    ythickness = 0
}

class "GtkToolbar" style "compact-toolbar"
widget_class "*<GtkToolbar>*<GtkButton>" style "compact-button"

Cool! Tried out on Eclipse Oxygen on Ubuntu Mate 16.10 beta2.
Thanks for the tip.

THX!!!
Linux Mint 18/Cinnamon with Eclipse neon.1

THX!!!

It works even on Oxygen GTK+ 2!
Just ignore the MPartStack bits (There aren't on .css file for Oxygen).
Thank you very much!!!

If you do wish to modify font-size under Eclipse Oxygen, this style has been refactored into e4_basestyle.css in this release.

Actually, for Oxygen we just need to force GTK 2 on Ubuntu 17.10.

Works for DBeaver (it is eclipse-based) on Debian Stretch
(css file can be found in /usr/share/dbeaver/plugins/org.eclipse.ui.themes_1.2.1.v20170809-1435/css/e4_default_gtk.css)