The javadoc says:
* For example, if the user presses <b>button 1</b> followed by
* <b>button 2</b>, and then releases them in the same order,
* the following sequence of events is generated:
* <PRE>
* <code>MOUSE_PRESSED</code>: <code>BUTTON1_DOWN_MASK</code>
* <code>MOUSE_PRESSED</code>: <code>BUTTON1_DOWN_MASK | BUTTON2_DOWN_MASK</code>
* <code>MOUSE_RELEASED</code>: <code>BUTTON2_DOWN_MASK</code>
* <code>MOUSE_CLICKED</code>: <code>BUTTON2_DOWN_MASK</code>
* <code>MOUSE_RELEASED</code>:
* <code>MOUSE_CLICKED</code>:
* </PRE>

But if you run the attached test under Windows XP (on jdk1.6.0_24b07, jdk7 or jdk8) you'll get the following output:
mousePressed
  BUTTON1_DOWN_MASK
mousePressed
  BUTTON1_DOWN_MASK
mouseReleased

mouseClicked

mouseReleased

mouseClicked

Therefore several steps (started from second mousePressed) are invalid