Currently, Sencha is part of the maven build process for SSP 2.0. Eventually, the same configuration will be added to the rel-1-2-patches and rel-1-1-patches branches.
Sencha Installation
Sencha SDK Tools can be downloaded from here: http://www.sencha.com/products/sdk-tools/download/
These steps are pertinent relevant for both the automated process as well as the manual process:
...
You can validate your Sencha installation by typing the following command (should get usage information back):
%> sencha --help
GENERAL DEVELOPMENT PROCESS
Developers should note that when adding new Ext classes, it is important to edit the ssp.jsb3 file so that the new classes will be included in the minification process.
AUTOMATED PROCESS (SSP 2.0)
Automated process for SSP 2.0:
MANUAL PROCESS (SSP 1.1.x and SSP 1.2.x)
Eventually, the same automated configuration will be added to the 1.2.x and 1.1.x. Until then, the manual process for these versions is:
...