[IDV #DIZ-849299]: NullPointerException adding two different fields

Paul,

I tried your formula and was able to make it work in my scenario so we are 
going to have to find out a bit more about what you are trying to achieve. 
Where is the data coming from? What fields are you trying to add? You can 
upload a data file for us to examine at 
http://motherlode.ucar.edu/repository/alias/idvupload.

Best Wishes,

Unidata IDV Support


> Full Name: Paul Graham
> Email Address: address@hidden
> Organization: Weathersim
> Package Version: 4.0u1 build date:2013-03-29 18:10 UTC
> Operating System: Mac OS X
> Hardware: Java: home: 
> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home version: 
> 1.6.0_51 j3d:1.5.2 fcs (build4)
> Description of problem:
> 
> When attempting to add two different fields in IDV using the following
> simple Jython method:
> 
> def simpleAdd(F1,F2):
> res = add(noUnit(F1),noUnit(F2))
> return res
> 
> The following error occurs:
> 
> "Making the widget component
> java.lang.NullPointerException"
> 
> 
> 
> ******************
> Stack trace:
> java.lang.NullPointerException
> at 
> ucar.unidata.idv.control.GridDisplayControl.getDataRangeInColorUnits(GridDisplayControl.java:264)
> at 
> ucar.unidata.idv.control.GridDisplayControl.getInitialRange(GridDisplayControl.java:233)
> at 
> ucar.unidata.idv.control.DisplayControlImpl.getRange(DisplayControlImpl.java:10001)
> at 
> ucar.unidata.idv.control.DisplayControlImpl.getRangeForColorTable(DisplayControlImpl.java:10029)
> at 
> ucar.unidata.idv.control.DisplayControlImpl.getControlWidgets(DisplayControlImpl.java:7588)
> at 
> ucar.unidata.idv.control.PlanViewControl.getControlWidgets(PlanViewControl.java:1543)
> at 
> ucar.unidata.idv.control.ContourPlanViewControl.getControlWidgets(ContourPlanViewControl.java:218)
> at 
> ucar.unidata.idv.control.DisplayControlImpl.doMakeWidgetComponent(DisplayControlImpl.java:7483)
> at 
> ucar.unidata.idv.control.PlanViewControl.doMakeContents(PlanViewControl.java:1498)
> at 
> ucar.unidata.idv.control.DisplayControlImpl.doMakeWindow(DisplayControlImpl.java:4266)
> at 
> ucar.unidata.idv.control.DisplayControlImpl.init(DisplayControlImpl.java:1141)
> at ucar.unidata.idv.ControlDescriptor.initControl(ControlDescriptor.java:986)
> at ucar.unidata.idv.ControlDescriptor$1.run(ControlDescriptor.java:911)
> at ucar.unidata.util.Misc$3.run(Misc.java:1249)
> 
> 
> 


Ticket Details
===================
Ticket ID: DIZ-849299
Department: Support IDV
Priority: Normal
Status: Open