FULL PRODUCT VERSION :
java version 1.6.0_16
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Server VM (build 14.2-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.22.14-72.fc6

EXTRA RELEVANT SYSTEM CONFIGURATION :
This problem bug is not present in JDK 1.6.0_11

On the other hand it is still present in JDK 1.6.0_17

A DESCRIPTION OF THE PROBLEM :
When updating the title of a tab in JTabbedPane using setTitleAt() submitting a HTML-string a new GapFiller object occupying more than 8 kBytes of heap is allocated and the old GapFiller object is not dereferenced.

Which means that each time you call setTitleAt() using a HTML tagged string 8 kBytes of heap memory leaks and can not be reclaimed.



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a JTabbedPane.
Add Tabs to the pane

Update the Tabs using setTitleAt() submitting a HTML-string in a loop

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The program will run for ever
ACTUAL -
The JVM consumes the complete heap and runs out of memory

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Do not use HTML defining the title of tabs in JTabbedPane