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 Apache libraries are also required to be on your classpath.
Note: jXLS may not work with legacy POI library releases. If you have any issues related to legacy POI api try to use older jXLS releases
You can build jXLS from source code if you need to get the latest changes which are not released yet. You will need Subversion client to get the source code and Apache Maven to build it. It can be done with such steps
svn co https://jxls.svn.sourceforge.net/svnroot/jxls/trunk jxls
mvn clean install