解决办法：
gitblit-1.8.0\WEB-INF\data\defaults.properties 里面的内容要修改才能启用工单功能。
# Valid services include:
# com.gitblit.tickets.FileTicketService
# com.gitblit.tickets.BranchTicketService
# com.gitblit.tickets.RedisTicketService
#
# SINCE 1.4.0
# RESTART REQUIRED
tickets.service = com.gitblit.tickets.BranchTicketService
官网有更详细的说明：
http://www.gitblit.com/tickets_setup.html
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这个工单功能咋用呢