The IDE enables you to reuse components that are packaged as JAR files. Two types of JAR files can be added to the WEB-INF/lib directory: tag library JAR files and all other JAR files.
To add a tag library JAR file to an existing web module, use the tag library repository.
To add any other category of JAR file to an existing web module you can:
When a web module containing .jar files in its WEB-INF/lib directory is mounted in the IDE, the .jar files in the lib directory are mounted as well.