Packages

The following convention should be followed for package naming:

The prefix of a unique package name is always written in all-lowercase ASCII letters and should be one of the top-level domain names, currently com, org,edu, gov, mil, net, or one of the English two-letter codes identifying countries as specified in ISO Standard 3166, 1981.

- Packages are all lower case to avoid conflict with the names of classes or interfaces.
- Special characters are not allowed while naming packages, only alphanumeric.
- Avoid reserve keywords

Subsequent components of the package name vary according to an organization's own internal naming conventions. Such conventions might specify on technical aspect or a feature aspect e.g employee, leave, department, project etc:

packaging by feature

- com.projectname.employee
- com.projectname.leave
- com.projectname.department
- com.projectname.project
- com.projectname.utils
- com.projectname.common

packaging by patterns

- com.projectname.controller
- com.projectname.service
- com.projectname.models
- com.projectname.factories
- com.projectname.utils
- com.projectname.repository

In some cases, the internet domain name may not be a valid package name. This can occur if the domain name contains a hyphen or other special character, if the package name begins with a digit or other character that is illegal to use as the beginning of a Java name, or if the package name contains a reserved Java keyword, such as "int". In this event, the suggested convention is to add an underscore. For example:

Domain Name	Package Name Prefix
hyphenated-name.example.org	org.example.hyphenated_name
example.int	int_.example
123name.example.com	com.example._123name