java.lang.ClassNotFoundException: org.springframework.boot.context.properties.ConfigurationBeanFactoryMetadata is an error message indicating that the specified class, ConfigurationBeanFactoryMetadata, could not be found. This error usually occurs when the application is unable to locate the required class at runtime.

There can be multiple reasons for this error. One of the main reasons is that the required library is missing. The class ConfigurationBeanFactoryMetadata is part of the Spring Boot framework and it is included in the spring-boot-configuration-processor dependency. Therefore, if this dependency is missing or the version is not compatible with the current Spring Boot version, this error will be thrown.

Another reason could be a classpath issue. The classpath is the set of locations that the JVM looks in to find the required classes at runtime. If the required library is not included in the classpath, the JVM will not be able to locate the class, resulting in a ClassNotFoundException error.

Additionally, this error can also occur if there is a version mismatch between the libraries. For example, if the project is using an older version of Spring Boot and the spring-boot-configuration-processor library is of a newer version, this can lead to a class not found exception. It is important to check the version of all the dependencies and make sure they are compatible with each other.

In order to resolve this error, you can check the dependencies in your project and make sure that the correct version of the spring-boot-configuration-processor library is included. If it’s missing, add it to your build file. Also, make sure that there is no other version of the same library which might be causing a conflict. Check the classpath and make sure that the required libraries are included. Finally, if you are still unable to resolve the error, check the version of your Spring Boot framework and make sure that all the dependencies are compatible with it.