异常:
Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/util/ClassUtils
缺少org.springframework.core包
<!-- https://mvnrepository.com/artifact/org.springframework/org.springframework.core -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>org.springframework.core</artifactId>
<version>2.5.6.SEC01</version>
</dependency>
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