I am using SQL Developer 220.127.116.11.80 with JDK 1.7.0_51 x64 on Windows 8.1
The graph component in my user defined report is not respecting the data label number format.
By default, it should show no decimal places. In the preview it shows no decimal places.
With my query, which returns a field plus its count, the graph component is showing the count data label with 2 decimal places.
See this image: http://imgur.com/R8xEm0y
I believe this is a bug.
Bonus question: why doesn't SQL Developer center align the bars properly if there is only one data series?
Update: Bug still present in 18.104.22.168.21 with JDK 1.8.0_05 x64 on Windows 8.1
I agree, that's a bug.