What library is commonly used to read and write data from Excel files in Java projects?

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Apache POI is widely recognized as the go-to library for reading and writing data from Excel files in Java projects. This library provides the necessary APIs to handle both the older Excel formats (XLS) and the newer formats (XLSX). With Apache POI, developers can create, modify, read, and write Excel documents seamlessly, allowing for robust data manipulation and report generation within Java applications.

The other libraries mentioned serve different purposes. JDBC (Java Database Connectivity) is primarily used for connecting and interacting with databases rather than handling Excel files. JUnit and TestNG are both testing frameworks used for unit testing and integration testing in Java, and they do not provide functionalities for reading from or writing to Excel files. Therefore, among the choices presented, Apache POI is indeed the correct library for working with Excel files in Java projects.