Kindly follow the following steps to build this application from command line
Step1: Move to the root repository of the application
Step2: execute the command 'gradle build' Now the .class files would have been created in the repository
Step3: execute the command 'gradle wrapper' Now the wrapper files for OS-X and linux(gradlew) and Windows(gradle.bat) files would have been generated now.
Step4: execute the command './gradlew run' Now the java application would have been executed.