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Vaadin Spreadsheet -java.lang.AbstractMethodError XSSFWorkbook.getNumCellSt
Vaadin Spreadsheet version: 1.3.0rc1
Vaadin version: 7.7.5
Using the import Excel spreadsheet example. Widgetset has been compiled successfully
I am trying out Vaadin Spreadsheet and encounter the following error:
Nov 27, 2016 1:14:06 PM com.vaadin.server.DefaultErrorHandler doDefault
java.lang.AbstractMethodError: Method org/apache/poi/xssf/usermodel/XSSFWorkbook.getNumCellStyles()I is abstract
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Appreciate any assistance.
Did this happen while opening a specific file? If yes, could you attach it?
I received this error when trying to load the window that will start the demo.
The break point indicates that the error occurs when a call is made to create a new Spreadsheet()
ok, that's strange,
are you running the demo project? or a new project? how are you creating/starting it?
No. Im running the demo as part of a current project.
I have tested it with both POI 3.15 and 3.16 beta.
I copied the code from the demo and ran that in a test class in my project
i have also made certain that only one POI version in classpatb
It's not so easy to see what could be happening without being able to reproduce it.
Vaadin Spreadsheet version: 1.3.0.rc1 works correctly with Vaadin version: 7.7.5 in my test project.
Is it a maven project? Can you try running `mvn dependency:tree` ?
The other thing that could work is to force a clean and build to be sure that no old version is cached somewhere.
Hope this helps,