Which version of DevTest are you using?
Check the version of poi-x.x.jar (where x.x = 3.14 or 3.17) deployed in your DevTest_HOME/lib/shared.
Version 3.14 does not support a setFillPattern method that takes an object of type FillPatternType.
poi.3.14.jar - takes a short
poi.3.17.jar - takes a FillPatternType
You might convert as follows:
NO_FILL 0, SOLID_FOREGROUND 1,
FINE_DOTS 2, ALT_BARS 3,
SPARSE_DOTS 4, THICK_HORZ_BANDS 5,
THICK_VERT_BANDS 6, THICK_BACKWARD_DIAG 7,
THICK_FORWARD_DIAG 8, BIG_SPOTS 9,
BRICKS 10, THIN_HORZ_BANDS 11,
THIN_VERT_BANDS 12, THIN_BACKWARD_DIAG 13,
THIN_FORWARD_DIAG 14, SQUARES 15,
DIAMONDS 16, LESS_DOTS 17,
LEAST_DOTS 18