This file is indexed.

/etc/java-11-openjdk/swing.properties is in openjdk-11-jre-headless 10.0.1+10-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

1
2
# uncomment to set the default look and feel to GTK
#swing.defaultlaf=com.sun.java.swing.plaf.gtk.GTKLookAndFeel