Bean Shell is java based scripting language.It uses java like syntax.It is very small in size i.e aprox. 150 kb.

It is used in jmeter for debugging,for logging info i.e logging log-in info,or logging error message or write our own function like fetching data from database.

Other languages supported by jmeter are JavaScript , python etc.

Bean Shell is written in Java.

To set up Bean Shell in our jmeter we go to lib folder in our jmeter folder and see if this file is there bsh-2.0b5.If it is there well and good otherwise go to http://beanshell.org/download.html and downloaf the bsh file and put it in our lib folder.