Spring-boot入门运行第一个程序报错 用的版本2.5.0

Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.util.Assert.isInstanceOf(Ljava/lang/Class;Ljava/lang/Object;Ljava/util/function/Supplier;)V
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:294)
    at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:118)
    at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:232)
    at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:213)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:167)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
    at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:76)
    at org.springframework.boot.SpringApplicationRunListeners.lambda$starting$0(SpringApplicationRunListeners.java:53)
    at java.util.ArrayList.forEach(ArrayList.java:1257)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:117)
    at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:53)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:328)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1336)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1325)
    at com.boot.DemoBoot.main(DemoBoot.java:9)

是跟着教程来的吗，那应该是环境问题导致的。

判断jar包冲突 在IDEA中使用maven的show dependences，可以很明显看到冲突在哪，这时找到依赖将其中一个排除掉即可

新手玩家直接从spring initializr去创建项目， 要什么依赖自己去选，别自己创建个普通的maven项目去改

java.lang.NoSuchMethodError: org.springframework.util.Assert.isInstanceOf 表示没有找到Assert#isInstanceOf 方法

Assert位于org.springfaramwork.core包， springboot 正常配置都会加载， 你检查下环境中是不是没有， 然后检查自己的配置

欢迎参考以下教程 https://www.cnblogs.com/teach/p/10326364.html