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Failed to execute CommandLineRunner
java.lang.NullPointerException: null ★★★ここ★★★
	at com.example.service.ExampleService.doSomething(ExampleService.java:15) ~[classes/:na] ★★★ここ★★★
	~省略~
	at com.example.Main.run(Main.java:21) [classes/:na] ★★★ここ★★★	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:806)	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:790)	at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:777)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)	at com.example.Main.main(Main.java:17)