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Altera_Forum
Honored Contributor I
786 Views

Error : Java exception

When I try to simulate an example I get always this error: 

 

Java exception occurred:  

java.lang.NullPointerException 

 

at com.altera.dspbuilder.simulation.Model.renameBlock(Unknown Source) 

 

at com.altera.dspbuilder.simulation.Mask.rename(Unknown Source) 

 

I don't know why I have always this message.
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6 Replies
Altera_Forum
Honored Contributor I
57 Views

Do you get this for all examples or just one specific one? 

 

One thing to try, is to make sure you have no unconnected input ports (especially to subsystems) as this has been known to cause problems.
Altera_Forum
Honored Contributor I
57 Views

It happens only for this example. 

All ports are connected but there is a parameter that cannot be evaluated. 

Is it the cause of this error?
Altera_Forum
Honored Contributor I
57 Views

It could be. Is this a design example shipped with DSP Builder? If so, let me know which one it is and I can take a look. If not, let me know the error message exactly and I can help you fix it.

Altera_Forum
Honored Contributor I
57 Views

Actually I'm working on channel estimation & equalization reference design

Altera_Forum
Honored Contributor I
57 Views

Try fixing the parameter error and see what happens. If the design can't initialise properly it's unlikely that DSPB will be able to synthesize it correctly.

Altera_Forum
Honored Contributor I
57 Views

I think I know why the parameter cannot be evaluated, my problem is in the chest_generateLUT parameter, when I checked for Chest_generateLUT.m file which should be in the ref design files, I realized that this file is missing

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