using this tutorial http://www.eclipse.org/birt/phoenix/deploy/viewerSetup.php#install_viewer
And it tells me to display the Tomcat manager application through this
Add the below users in the xml file
<role rolename="tomcat"/>
<role rolename="manager-gui"/>
<role rolename="manager"/>
<user username="tomcat" password="tomcat" roles="tomcat"/>
<user username="tomcat" password="tomcat" roles="tomcat,manager-gui,manager"/>
Copy tomcat-user.xml file in eclipse workspace server's tomcat directory