Spring Boot

app.groovy

class Demo {

	public static String foo() {

		return "Hello Spring Boot";
	}

}


class Employee {

	String name;
	int salary;

	public Employee() {
		this.name = "";
		this.salary = 0;
	}

	public Employee(String n, int s) {
		this.name = n;
		this.salary = s;
	}

}


@RestController
class HelloWorld {
  @RequestMapping("/")
  String hello() {
    "Hello JournalDev World."  + Demo.foo();
  }

	@RequestMapping("/emps")
	public List<Employee> getEmps() {
		List<Employee> list = new ArrayList<>();
		list.add(new Employee("Alfi", 20000))
		list.add(new Employee("Nikhil", 30000))
		return list;
	}

	@RequestMapping("/sqr")
	String getSqr(@RequestParam("num") int x) {
		"Square of " + x + " is " + (x * x);
	}

	@RequestMapping("/emp")	
	public ResponseEntity<Employee> readRawJson(@RequestBody Employee e) {
		System.out.println("\n=============="+ e.name +"==============\n");
		return ResponseEntity.ok(e);
	}
}

To run via CLI

spring run app.groovy — –server.port=9000

Ref Link:
https://docs.spring.io/spring-boot/docs/current/reference/html/cli.html