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package hello;
 
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.stereotype.*;
import org.springframework.web.bind.annotation.*;
 
@Controller
@EnableAutoConfiguration
public class SampleController {
 
    @RequestMapping("/")
    @ResponseBody
    String home() {
        return "Hello World!";
    }
 
    public static void main(String[] args) throws Exception {
        SpringApplication.run(SampleController.class, args);
    }
}

Main.java:10: error: class SampleController is public, should be declared in a file named SampleController.java
public class SampleController {
       ^
Main.java:3: error: package org.springframework.boot does not exist
import org.springframework.boot.*;
^
Main.java:4: error: package org.springframework.boot.autoconfigure does not exist
import org.springframework.boot.autoconfigure.*;
^
Main.java:5: error: package org.springframework.stereotype does not exist
import org.springframework.stereotype.*;
^
Main.java:6: error: package org.springframework.web.bind.annotation does not exist
import org.springframework.web.bind.annotation.*;
^
Main.java:8: error: cannot find symbol
@Controller
 ^
  symbol: class Controller
Main.java:9: error: cannot find symbol
@EnableAutoConfiguration
 ^
  symbol: class EnableAutoConfiguration
Main.java:12: error: cannot find symbol
    @RequestMapping("/")
     ^
  symbol:   class RequestMapping
  location: class SampleController
Main.java:13: error: cannot find symbol
    @ResponseBody
     ^
  symbol:   class ResponseBody
  location: class SampleController
Main.java:19: error: cannot find symbol
        SpringApplication.run(SampleController.class, args);
        ^
  symbol:   variable SpringApplication
  location: class SampleController
10 errors

Standard output is empty