JBoss - know more about the JBoss directory structure

Fundamentally, the JBoss architecture consists of the JMX MBean server, the microkernel, and a set of pluggable component services - the MBeans.

The JBoss Application Server ships with three different server configurations. Within the <JBoss_Home>/server directory, you will find three subdirectories: minimal, default and all. The default configuration is the one used if you don’t specify another one when starting up the server.

If you want to know which services are configured in each of these instances, look at the jboss-service.xml file in the <JBoss_Home>/server/<instance-name>/conf/ directory and also the configuration files in the <JBoss_Home>/server/<instance-name>/deploy directory.

JBoss 4.0 features an embedded Apache Tomcat 5.5 servlet container.

conf --> The conf directory contains the jboss-service.xml bootstrap descriptor file for a given server configuration. This has the jboss-log4j.xml file which configures the Apache log4j framework category priorities and appenders used by the JBoss server code.
data --> The data directory is available for use by services that want to store content in the file system. It holds persistent data for services intended to survive a server restart. Serveral JBoss services, such as the embedded Hypersonic database instance, store data here.
deploy --> The deploy directory contains the hot-deployable services (those which can be added to or removed from the running server). You deploy your application code by placing application packages (JAR, WAR and EAR files) in the deploy directory. The directory is constantly scanned for updates, and any modified components will be re-deployed automatically.
lib --> This directory contains JAR files (Java libraries that should not be hot deployed) needed by this server configuration. You can add required library files here for JDBC drivers etc. All JARs in this directory are loaded into the shared classpath at startup.
log --> This is where the log files are written. JBoss uses the Jakarta log4j package for logging and you can also use it directly in your own applications from within the server. This may be overridden through the conf/jboss-log4j.xml configuration file. The file boot.log logs the JBoss startup and shut down notifications. This log is overwritten each time JBoss is (re)started.
tmp --> The tmp directory is used for temporary storage by JBoss services. The deployer, for example, expands application archives in this directory.
work --> This directory is used by Tomcat for compilation of JSPs.

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