We have already made a CRM from open source in Java.
CentraView CRM- Browser based Enterprise Java (J2EE) Contact Management, Groupware, Collaboration, CRM, SFA, Project Management software. Run locally or as a hosted service. Built on Apache Tomcat, JBoss, MySQL, Linux (Fedora, RedHat and others) & Windows.
We are ready to install this crm within 1 day. Further customization might take additional 1 or 2 days.
We can show you a demo of the crm. You can also review it in google.