Concurrency problem with CategoryItemLabelGenerator

sakaray_c · Post by **sakaray_c** » Wed Mar 10, 2004 6:32 am

Hi,

I am using CategoryItemLabelGenerator for generating custom labels for bar charts. I am getting labels.

But it is giving exception when more than one user access at a time.
It is giving java.lang.NullPointerException (or) java.lang.ArrayIndexOutOfBoundsException
at generateItemLabel() method.

Can u pls tell me whats wrong.

Thanks and Regards,
sakaray_c

Post by **david.gilbert** » Wed Mar 10, 2004 3:24 pm

Can you supply the complete exception text and some info about how you construct your charts? There may be a problem in that the NumberFormat and DateFormat objects used by the label generator are not thread-safe - and JFreeChart isn't doing anything to externally synchronise them.