As I currently faced the problem that I have to deploy patches for Java support packages and got stuck with SUM (although I put the correct patches in stack.xml using Maintenance Optimizer, nothing has been changed to the system except I lost all my ABAP loads), I want to share an alternative to JSPM (which isn't supported any more, see http://service.sap.com/sap/support/notes/1589311) and SUM.
First, you need to know your instance number - let's say instance is running on 50. Then you need a shell where you can start telnet connections to port 5<instance number>08:
In this example I logged in to the server first and connected to localhost. Log in with your admin account, e. g. j2ee_admin for doublestack systems.
After login, you may see which commands are available using man:
Now the deployment can start (to be continued...).