java.lang.IllegalStateException: Failed to execute CommandLineRunner ★★★ここ★★★

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Failed to execute CommandLineRunner
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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)

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