When POI dependency is introduced, XSSFWorkbook is unavailable reason

1. Since XSSFWorkbook exists in another package, the following two dependencies need to be introduced to be available

<dependency>
    <groupId>org.apache.poi</groupId>
	<artifactId>poi</artifactId>
	<version>3.14</version>
</dependency>
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>3.14</version>
</dependency>