JOnAS requirements

Software requirements

Here is a list of the main software components you may need in order to run JOnAS:

• a Java^TM2 Software Development Kit (SDK) version 1.2 or higher. A SDK version 1.3 is recommended but if you want to stick to your old SDK it is fine as long as it is compliant with the 1.2 specification. JOnAS also works with the current release candidate of SDK 1.4, but it is still somewhat unstable and you certainly may prefer a more stable SDK for both development and production environments.

• a Web server and a JSP/Servlets server. The most popular Open Source software used are Apache and Jakarta Tomcat.

• a Database server. Any database with a JDBC driver can be used with JOnAS. There are several Open Source databases such as PostgreSQL or MySQL, but you can also use commercial databases such as Oracle, DB2, Informix, Sybase or SQL server ...

Hardware requirements

There is no specific hardware requirement per-say for running JOnAS. All you need is a Java Virtual Machine that supports your hardware environment. However, we can be more specific and give some examples.

Here is an example of a Linux configuration we are using for the development of a small application with 10 beans:

• Pentium^TM II 300MHz

• 128MB RAM

• Disk space:

  • 36MB for Apache,

  • 16MB for Tomcat,

  • 21MB for JOnAS,

  • 24MB for MySQL

  • 10MB for application development (this really depends on your application)

  • 400MB for the database data

This workstation is quite old right now but it is still fine to develop. The compilation of the whole application (classes, stubs, ...) takes around 20 seconds which is quite acceptable. When everything is up, it means that we have XEmacs, Apache, Tomcat, JOnAS, MySQL and Netscape running alltogether on this node. There is little free memory left when all this is running, but it works fine as long as you just need to debug your application. Don't think of doing a performance evaluation on such a platform, you'll kill your disk with swapping.

Here is an example of a configuration we use for benchmarking:

• Pentium^TM III 900MHz

• 1GB RAM

• Disk space: same as above except for database data that is around 1.5GB

When we run the RUBiS benchmark, we use 4 different machines to run the Web, Servlet, EJB and Database servers. The critical resource in our benchmark is always the processor on the EJB or Database server. The memory footprint is around 110MB for the Web server, 90MB for the Servlet server, 200MB for the EJB server and up to 800MB for the database. But, once again, this is completely specific to this particular application. Other applications may have completely different memory requirements. More extensive information and results about the RUBiS benchmark can be found on http://www.cs.rice.edu/CS/Systems/DynaServer.