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problem created Gantt chart by JfreeChart

alberwaaz sara
Greenhorn

Joined: Apr 21, 2011
Posts: 2
Hii ,,,

I have problem with gantt chart connected with database, the chart wasnot drawn correctly,, I dont konw what the problem !!!



and this the output


Successfully connected to the DataBase Server...
A 2011-04-21 2011-04-23
B 2011-04-24 2011-04-25
C 2011-04-26 2011-05-02
D null null
java.lang.NullPointerException




and the chart is this :






as you see,, its read the data from database, but its only show the date for task A,,, but with 3 lines !!!
any one, can help me ???

alberwaaz sara
Greenhorn

Joined: Apr 21, 2011
Posts: 2
Can any one help me ???
 
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subject: problem created Gantt chart by JfreeChart