The spec for Toolkit.getDefaultToolkit() states:

  Gets the default toolkit.

  If there is a system property named "awt.toolkit", that property is treated as the
  name of a class that is a subclass of Toolkit.

  If the system property does not exist, then the default toolkit used is the class
  named "sun.awt.motif.MToolkit", which is a motif implementation of the Abstract
  Window Toolkit.

The implementation works differently if JDK is run on Solaris in headless mode (with
"-Djava.awt.headless=true"). The system property doesn't exist, but the returned toolkit
is always an instance of sun.awt.HeadlessToolkit.
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