SMM is a pivot format. MoDisco does not provide connectors to populate SMM models from existing QA tools. If you want to populate an SMM model from existing QA tools, you have to create a transformation to convert QA tool format output to SMM model.
However, if you want to calculate metrics on JAVA, you can use JAVA model discover provided by MoDisco. Then, you create a transformation to compute the metrics and populate an SMM model.