Apache JMeter is an open source Apache project. It is a pure Java application. Apache JMeter is used to load test, analyze, and measure the performance of services.
JMeter (http://jmeter.apache.org) is an open source tool for stress testing. It allows you to visually create a test plan and then hammer systems based on that plan.
JMeter can make many types of requests, known as samplers. It can sample HTTP, LDAP, and databases, use scripts, and much more. It can report back visually with listeners.
A beginner's book on JMeter is Apache JMeter by Emily H. Halili, published by Packt Publishing, ISBN 1847192955 (http://www.packtpub.com/beginning-apache-jmeter).
Two more advanced books from the same publisher are https://www.packtpub.com/application-development/performance-testing-jmeter-29 and https://www.packtpub.com/application-development...
Two more advanced books from the same publisher are https://www.packtpub.com/application-development/performance-testing-jmeter-29 and https://www.packtpub.com/application-development...