Runtime error...

Steve64

I’m getting the following runtime error when instantiating a one of my objects that contains 2 uart VPs:

[noparse][[/noparse]Error IDE-0028] Unhandled exception in JVM: java.lang.NullPointerException
Exception thrown in file ‘C:\...\VirtualPreipheral.java’ at line 15

It appears that the error is occurring when the first of·the uart VPs is created. The uarts would be the 4th and 5th VPs created. Any clues there I should be looking for the problem?

Thanks

Peter Verkaik

Post your code.
regards peter

Steve64

Not mine to post·on a public forum. Is there a private way to get it to you?
·

Peter Verkaik

You can post it to verkaik6@zonnet.nl
regards peter

Steve64

Peter,

my email was rejected by your mail server

The original message was received at Sat, 4 Nov 2006 10:37:01 -0800
from adsl-68-122-0-169.dsl.pltn13.pacbell.net [noparse][[/noparse]68.122.0.169]

·

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The following addresses had permanent fatal errors

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<verkaik6@zonnet.nl>
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I'll figure out the runtime error myself...

Thanks anyway
Steve

Peter Verkaik

A nullpointer exception usually refers to an uninitialized variable.
For example, if you define
Uart myUarts[noparse]/noparse = new Uart[noparse][[/noparse]2]; //define array of 2 uarts
Then you must still initialize the array elements.
myUarts[noparse][[/noparse]0] = new Uart(...);
myUarts[noparse][[/noparse]1] = new Uart(...);
before using those elements.

regards peter

Steve64

Now that the first pass on the projsct shipped out, time to provide an update on the problem...

I was consistantly able to fix the issue by doing one of two thing:

1. Replace the Javelin Module with another then·reload the code. This worked most of the time.

2. Load a completely different piece of code, run it, then reload the original code. This worked every time.

Another observation is the problem completely went away after I switched from using my ThinkPad laptop to a desk top machine as the host of the IDE.

It's entirely possible that I had NULL pointers in my code that I subconsciously fixed when I moved from the ThinkPad to the desk top machine. I guess we'll never know.

Another interesting nugget of information: A seemingly random "out of memory" error that I was experiencing also went away when I switched computers...

Steve