By Default, table cell doesn't have alignment details even though it is considered as TOP alignment in MS-WORD. So which accessing cell alignment, the method XWPFTableCell.getVerticalAlignment() is throwing nullpointerException
I already fixed. Please refer https://github.com/apache/poi/pull/30
r1731257 Thank you for the pull request w/ test document. I made a small modification to return "null" if nothing is specified. I agree that the Word Application assumes TOP if alignment is not specified, but I'd like to keep the code closer to the xml. If others disagree, we can change it back. The mods you suggest do fix the NPE, and I've included your test and test docx. Thank you!
Behavior changed to return default of XWPFVertAlign in r1746625. Restored original behavior to return null if alignment is not set in r1782130 and r1782225.