JDBC Driver Settings for Oracle RAC

Dec 7, 2014

If you are modifying your java application to use Oracle Real Application Clustered (RAC) Database instead of standard single-node database server (Express or Standard edition), then you need to modify settings of your JDBC driver.

Oracle Thin Driver

Oracle thin driver’s jdbc URL needs to be changed:


Also, it is highly recommended to use LDAP directory server instead of hardcoding hostnames into configuration directly:

The point of a tnsnames file, the older Oracle Names server, and the newer, recommended LDAP directory server method of resolving database names is to avoid having to hardcode hostnames, addresses, ports, etc. into your connection string. The DBAs should be able to move the database to a new host or port without breaking anything. The best way to set your thin connect URL is with the following syntax:

jdbc:oracle:thin:@ldap://<OID server name>:<OID port>/<DB SID or Service Name>,cn=OracleContext,dc=<yourdomain>


More detailed information on configuring JDBC driver for RAC you may find on the Oracle’s site:

See Also

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WebJars: Easy Packaging Client Libraries

When developing java web application it is often annoying to manage third-party javascript libraries. Especially, when it is necessary to upgrade some of them. The project “WebJars” makes a life easier for such lazyefficient developers, like me :-) There is a wide range of popular javascript libraries packaged int Jar archives and ready to be included as a dependencies into your project. It is described in the documentation how to configure resource mapping in a web framework of your choice.

Jolokia: HTTP/JSON bridge for JMX

Very often there is a need to monitor the Java application server. For example, external monitoring tool, like Nagious/Zenoss/Zabbix needs to get some metrics, like heap memory usage or thread count.

Usual way to get that metrics is to setup access to application server via JMX.

But, sometimes, it is not possible to leave some other port opened for JMX and the only port available is HTTP(80 or 8080) or HTTPS(443 or 8443).

Here the Jolokia comes to rescue!

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