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How to configure database failover and high availability in JBoss 7 Datasource?


If we are configuring our application for high availability and disaster recover, it is mandatory to have failover configurations at DB datasource level as well. In this page, we described how to configure database failover in JBoss 7. Close watch below JBoss datasource configurations. The "connection-url" tag contains two connection urls with a delimiter "|". The delimiter character also required to mention with "url-delimiter" tag.

With this failover configuration, JBoss connects to the first specified DB. On any failure, JBoss tries to connect to second DB url.

<datasource jndi-name="java:jboss/jdbc/HADatasource" pool-name="HADatasource" 
												enabled="true" use-java-context="true">
	<connection-url>
		jdbc:oracle:thin:@db-host:db-port/service|jdbc:oracle:thin:@db-host:db-port/service
	</connection-url>
	<url-delimiter>|</url-delimiter>
	<driver>oracle</driver>
	<security>
		<user-name>user-name</user-name>
		<password>password</password>
	</security>
</datasource>
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JBoss configuration examples

  1. How to start/stop JBoss AS 7 in standalone mode?
  2. How to load external property file in JBoss 7 classpath?
  3. How to configure Data Source (JDBC Connection Pool) in JBoss AS 7 standalone mode?
  4. How to configure database failover and high availability in JBoss 7 Datasource?
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Preemptive scheduling Vs Time slicing?
Preemptive scheduling: The highest priority task executes until it enters the waiting or dead states or a higher priority task comes into existence.

Time slicing: A task executes for a predefined slice of time and then reenters the pool of ready tasks. The scheduler then determines which task should execute next, based on priority and other factors.
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About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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