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I solved it. :)
I have put that line of code a few lines above and I made the line Return something.
Now it does work.

Thanks everyone. :)

Maybe it helps if I show some output this makes?

This is my excel file:
Sample_4 Cy3 Cat Old
Sample_7 <empty cell here> Human Old

This is what is hapening when it runs:

...

There is not so much to be found on this function.
It only should make sure that empty cells are not skipped over.
And nothing else.

I think it is this one:
(When I remove this one I don't get the error.)



String BlankOrNot = ("" + row.getCell(blank, Row.CREATE_NULL_AS_BLANK));

But that is some code I need to find...

That is a bit of the problem.
It only runs this subclass.
So it is not used somewhere else yet.

Sure.
This is the error code I am having:



Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(Unknown...

Yesterday I hoped I had finished program 1, but it appears to have a fault in it.
And that is that it won't take empty cells.
(It is a program that read in an excel file to a MultiHashMap, uses...