You can download the latest release version of jXLS library from sourceforge site
To use jXLS engine you have to put
jxls-core
jar in your classpath.
And if you are planning to use jXLS to read XLS files you have to add jxls-reader
jar file to your classpath.
If you use Maven to build your application you can specify required jXLS modules in your pom.xml as dependencies to allow them to be downloaded from Maven repository
The following Jakarta libraries are also required to be on your classpath.