...
Alternatively you can use an existing keystore. In the example below just change the mdx.signer.alias parameter and add a parameter mdx.signer.keystore pointing to the keystore file. Review the documentation for keytool to figure out if you need to add other parameters for setting key size, validity time etc that may be applicable for your situation.
Run the aggregator
You will need a version of java 1.6 to run the aggregator. Launch the aggregator by running this. The '\' indicate line breaks and can be removed if you put the entire command on one line.
...