Java Application Monitor

The Java Application Monitor (JAMon) is a free, simple, high performance, thread safe, Java API that allows developers to easily monitor production applications.

JAMon can be used to determine application performance bottlenecks, user/application interactions, track application scalability, and more.

JAMon gathers aggregate performance statistics such as hits, execution times (total, average, minimum, maximum, standard deviation), as well as concurrency information such as simultaneous application requests.

It comes with several ways to monitor your application that require no application code changes. Usually all that is required is to add a line to an xml file, and make the jamon jar file available. Some examples:
- JDBC/SQL monitoring via the JAMon JDBC proxy driver (works with any other JDBC driver),
- Log4j monitoring via the JAMon log4j Appender,
- HTTP Monitoring. Monitor requests/responses to Tomcat, Jetty, JBoss or any other JAVA web container.
- EJB3 monitoring using the JAMon EJB interceptor.
JAMon was developed primarily for monitoring J2EE applications, however JAMon 1.0/2.0 can be used in any JDK 1.2 or higher environment, and JAMon 2.1 can be used in any JDK 1.4 or higher environment.

JAMon can be used in Servlets, JSP's, EJB's and Java Beans in various J2EE Application Servers (Sybase's EAServer, and BEA's WebLogic, WebSphere…), and can also be used in other programming environments that can call Java code (ColdFusion, PowerBuilder, BroadVision, ...). JAMon is particularly useful in multithreaded software like a database engine.