Exception in thread “main” java.lang.IllegalArgumentException: Cannot instantiate interface org.springframework.context.ApplicationContextInitializer : org.springframework.boot.context.ConfigurationWarningsApplicationContextInitializer
at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:445)
at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:427)
at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:420)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:272)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:253)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
at com.brucexx.dr.runner.ApplicationRunner.main(ApplicationRunner.java:55)
Caused by: java.lang.NoClassDefFoundError: org/springframework/core/KotlinDetector
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:188)
at org.springframework.boot.SpringApplication.createSpringFactoriesInstances(SpringApplication.java:441)
… 7 more
Caused by: java.lang.ClassNotFoundException: org.springframework.core.KotlinDetector
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
… 9 more
升级了spring 的框架导致的，检查pom中是否有spring-core这个包，如果有，删掉，主体的spring boot2.0以上，spring-core这个包，都不需要再继续使用，直接删除
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