The exception “exception in thread “main” java.lang.noclassdeffounderror: org/springframework/core/metrics/applicationstartup” occurs when the JVM cannot find the specified class at runtime. This error typically occurs when the class is present during compilation but not available during runtime due to missing dependencies or incorrect classpath configuration.
To resolve this issue, you need to ensure that the necessary dependencies are properly included in your project’s classpath. Here’s an example of how you can do it using Maven:
<dependencies>
<!-- Other dependencies -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core-metrics</artifactId>
<version>[version]</version>
</dependency>
</dependencies>
In the above example, you need to replace [version] with the appropriate version of the spring-core-metrics library that you want to use. Once you have added the dependency, rebuild and run your application to see if the issue is resolved.
It’s important to note that the above example assumes you are using Maven as your build tool. If you are using a different build system, the steps may vary. Also, make sure to check for any other potential causes of the error, such as incorrect class names or classpath misconfigurations.