1) I have removed package declaration for both java files. You can add package declaration if you want.
2) After building, you can invoke 'java -cp <jar_name> TxFunctionsInstaller <datomic_uri>'
3) Example java -cp retract_entity.jar TxFunctionsInstaller datomic:cass://localhost:9042/datomic.datomic/cdc-payroll-us-trunk-metadata?user=datomic&password=datomic'