Or simply use JIRA Enhancer Plugin, it has two post functions
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I think, Jira bydefault provide Assignee field on Reopen Issue screen(it is Workflow screen).
Otherwise you want to set the Assignee based on some condition, then you need to go for Workflow postfunction as Prasad suggested.
For workflow postfunction, you need to go through
http://www.j-tricks.com/1/post/2010/08/workflow-post-function.html
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yes you can do this through postfunction
you can develop your own function by using scriptrunnercheck this
https://jamieechlin.atlassian.net/wiki/display/GRV/Script+Runner
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