Unable to find main class :bootRepackage

There are two possibilities

1. Your source directory is not in the right location (use the sourceSets directive to fix this. your source directory should resemble something like src/main/java/your/package)

2. Add this to indicate where your main class is

   springBoot {
        mainClass = "hello.FileUploader"
   }
   

I am pretty sure it is 1.