check the atlassian document here
https://developer.atlassian.com/display/JIRADEV/How+to+create+a+new+Custom+Field+Type
check @jobin site here to know how to develop custom field type
http://www.j-tricks.com/1/post/2010/08/custom-fields.html
some sample code
https://bitbucket.org/rbarham/jira-watcher-field-plugin/src/1db057227245cf80765ac3062ab254f7001e8b5d/src/main/java/com/burningcode/jira/issue/customfields/impl/WatcherFieldType.java?at=master
https://bitbucket.org/innovalog/jmcf/src/ad0f6fa4fb9ba14b4217bc9e98d10b7523cde132/src/main/java/com/innovalog/jmcf/fields?at=master
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