https://poi.apache.org/faq.html#faq-N10025
Make sure you don't have mixed versions of POI on your class path.
Also, why the com.sun namespace prefix to org.apache.poi? Is this something
that resin4 is doing?
Are you using an unofficial fork of POI?
On Jan 25, 2017 12:56 AM, "Christian Castelli" <christian.caste...@habble.it>
wrote:
> Have you included this dependency for your project?
>
> <dependency>
> <groupId>org.apache.poi</groupId>
> <artifactId>poi-ooxml</artifactId>
> <version>${apache.poi.version}</version>
>
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