RFR: 4337898: Serializing DefaultTableCellRenderer changes colors [v4]

[Prasanta Sadhukhan]

On Fri, 12 Dec 2025 01:26:40 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> > > > How/why does null restore the JTable-specified colors ? I don't see anything about null in the spec. And what have people been doing the last 25 years if serializing a JTable "broke" its rendering ?
> > > 
> > > 
> > > Specifying null would cause `unselectedForeground` and `unselectedBackground` to be null
> > > so it will fallback to table assigned foreground and background color
> > 
> > 
> > So how do people know that ? Reading the source and trial and error don't count as ways to know.
> 
> Its implementation detail, not sure why people need to know upfront... Are you thinking of user who will extend DefaultTableCellRenderer and provide its own implementation... In that case, do you want me to add some spec wording to DefaultTableCellRenderer?

@prrace Will this wordings be sufficient?


     /**
      * See readObject() and writeObject() in JComponent for more
      * information about serialization in Swing.
+     * Setting foreground and background color to null will restore
+     * the foreground and background color to JTable cell's set
+     * foreground and background color
      */
     @Serial
     private void writeObject(ObjectOutputStream s) throws IOException {

Will it need a CSR? Please let me know soon for me to work on it..

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PR Comment: https://git.openjdk.org/jdk/pull/28549#issuecomment-3654486494