Creating Chart and Threading

[Souma]

My createChart class creates faster than processing queries (due to large database, query takes some time to return the processed result to createChart class) thus i get nullpointerexception most of the time...

Any help on this?

How do i implement threading in this case? Any sample on applying threading to create chart (not sample on threading pls... i got tonnes..)?

[mhilpert]

Why do you get NullPointerExceptions? If you don't have data, it doesn't make sense to create the chart. So why did you split both in separate threads? If you have a good reason for this, you need to synchronize both, meaning: let chart wait until data is available.