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[SOLVED] java.lang.NoSuchMethodError: org.springframework.boot.SpringApplication.run(Ljava/lang/Object;[Ljava/lang/String;)Lorg/springframework/context/ConfigurableApplicationContext;

Error added: 2020-11-22T14:26:41Z

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I'd updated Spring Boot 1.4 to 2.1 when I got this.
Nothing was actually wrong here. Just there were some old classes left around from the old version of Spring Boot.

mvn clean solved it.

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