Blog dedicated to Oracle Applications (E-Business Suite) Technology; covers Apps Architecture, Administration and third party bolt-ons to Apps

Tuesday, September 4, 2007

Importance of /etc/hosts in Oracle Apps

The hosts file is a file used to store information on where to find a node on a computer network. This file maps hostnames to IP addresses. The hosts file is used as a supplement to (or instead of) the domain name system on networks of varying sizes. This file is (unlike DNS) under the control of the root user of a server. In Solaris it is present in /etc directory.

It is very important that the /etc/hosts file of your server be in this format:

IP address hostname.domainname hostname (without domain name)

Many of the Apps DBA utilities give strange errors if the /etc/hosts file is not in the above format. One such error is described in metalink note 337741.1

If you do dbTechStack on a server with incorrect format in /etc/hosts, the following error is logged:

java.lang.NullPointerException at

The solution is simple. You need to correct the format of your /etc/hosts file.

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