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Its value is returned by the getSession() method. You need to read the API doc for the method to see why it returns a null value.
I don't know anything about the packages, classes and methods the...

What statement is on line 26?

That error usually means there is a null value. How did you check the values on that line?

There was a null value at line 26. Look at line 26 to find what was null. Then backtrack in the code to see why it was null.