FULL PRODUCT VERSION :
java version "1.7.0_40"
Java(TM) SE Runtime Environment (build 1.7.0_40-b43)
Java HotSpot(TM) 64-Bit Server VM (build 24.0-b56, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Darwin 11.4.2 Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64 x86_64

A DESCRIPTION OF THE PROBLEM :
Calling the setLocationByPlatform method on a java.awt.Frame instance doesn't have any effect.

REGRESSION. Last worked in version 6u45

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the FrameLocationByPlatformTest application below and observe the location of the opened frames.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I expected the frames would not cover each other, the second one being shifted.
ACTUAL -
The two frames are located at the same place.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class FrameLocationByPlatformTest {
  public static void main(String [] args) {
    java.awt.Frame frame1 = new java.awt.Frame("Frame 1");
    frame1.setSize(500, 300);
    frame1.setLocationByPlatform(true);
    frame1.setVisible(true);

    java.awt.Frame frame2 = new java.awt.Frame("Frame 2");
    frame2.setSize(500, 300);
    frame2.setLocationByPlatform(true);
    frame2.setVisible(true);
  }
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Change the location of the frame according to the location of all the opened frames and shift it yourself, for example with some code similar to the following:

int minX = Integer.MAX_VALUE;
int minY = Integer.MAX_VALUE;
int maxX = Integer.MIN_VALUE;
int maxY = Integer.MIN_VALUE;
for (Frame otherFrame : Frame.getFrames()) {
  if (otherFrame.isShowing()) {
    minX = Math.min(minX, otherFrame.getX());
    minY = Math.min(minY, otherFrame.getY());
    maxX = Math.max(maxX, otherFrame.getX());
    maxY = Math.max(maxY, otherFrame.getY());
  }
}

if (minX == Integer.MAX_VALUE || minX >= 23) {
  x = 0;
} else {
  x = maxX + 23;
}
if (minY == Integer.MAX_VALUE || minY >= 23) {
  y = 0;
} else {
  y = maxY + 23;
}
// Set the location of the new frame
frame.setLocation(x, y);