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many thanks for the kind words

It always did for me.

Where is the value of curr set? It's an argument to a method. What is its value when the call is made?
Is null a valid value? What would it be if the list is empty?

Sorry I don't understand where you are referencing curr that it is null. I assume that curr is the value passed to a method. Can you show the code and the debug output that shows when it is null?

What is the logic? Your code has no comments so I don't know what your logic is.

When I added these two comments at the appropriate places in the code, I saw what was wrong and was able to fix it....

Time to get out the paper and pencil and work thru how the links should be set and when.
I notice that there are no comments in the code as to what it needs to do at each point in the logic.
For...

I don't know how you are debugging. I use printlns.
For good debug output you need to add a toString method to Node class:

public String toString() {
return...

Could you send the one I'm to test. Not edits needed.
The one you sent was unformatted. I don't like working with unformatted code.
Be sure the code is formatted.

The one that shows the problem.

Can you post code that compiles and executes that shows the problem?
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