Hi
Your config of EX looks good, but do you want to use it as a pure L2 switch or route taffic between vlans on it?
In case of pure L2, vlan interface configuration may not be needed at all. Just create access or trunk ports and assign them vlans.
In case of L3, you create a vlan interface (e.g. vlan.100) and then, in the definition of vlan, you should add
set vlans vlan_100_name l3-interface vlan.100
This will enable routing from vlan to other vlan as well as management on the ip of vlan interface.