Access Jira on VirtualBox from host

I'm developing a plugin for JIRA and installed the Atlassian SDK on a Xubuntu 14.04 guest on a Win7 host with VirtualBox. On my VM I can access my JIRA instance via localhost:2990/jira or my given IP adress 10.0.2.15:2990/jira. Now I need to access the JIRA instance from my Win7 host. How can I achieve this?

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