Bug ID: JDK-6322433 REGRESSION: JDialog and JWindow throw IAE in headless mode

Type: Bug
Component: client-libs
Sub-Component: java.awt
Affected Version: 6

Priority: P3
Status: Closed
Resolution: Duplicate
OS: generic
CPU: generic

Submitted: 2005-09-12
Updated: 2017-05-19
Resolved: 2005-12-22

JDialog and JWindow constructors (no-argument constructors or when passing null as argument) throw IllegalArgumentException instead of HeadlessException in headless mode. This is reproducible from b50 onwards on all platforms.

Stack trace:
Exception in thread "main" java.lang.IllegalArgumentException: headless environment
        at java.awt.Window.init(Window.java:304)
        at java.awt.Window.<init>(Window.java:299)
        at java.awt.Window.<init>(Window.java:425)
        at java.awt.Dialog.<init>(Dialog.java:642)
        at java.awt.Dialog.<init>(Dialog.java:392)
        at javax.swing.JDialog.<init>(JDialog.java:220)
        at javax.swing.JDialog.<init>(JDialog.java:167)
        at javax.swing.JDialog.<init>(JDialog.java:140)

EVALUATION The problem is not in Swing code, but in AWT one: we throw wrong exception from java.awt.Window constructor, and all the subclasses do the same. I have filed a separate CR 6366441 for this issue and closing this as duplicate of it.

22-12-2005

EVALUATION This casued by the fix for 6300062

15-09-2005

Duplicate :	JDK-6366441 - Window() constructor should throw HeadlessException instead of IAE in headless mode
Relates :	JDK-6300062 - JDialog need to support true parent-less mode