java.lang.ClassNotFoundException: org.codehaus.jackson.map.ObjectMapper

This error indicates that the class "org.codehaus.jackson.map.ObjectMapper" could not be found. This class is part of the Jackson library, which is used for working with JSON data in Java.

Possible causes of this error include:

1. The Jackson library is not included in the project's dependencies or classpath.
2. The version of the Jackson library being used is outdated or incompatible with the project.
3. There is a typo in the code referring to the class.

To resolve this error, make sure that the Jackson library is included in the project's dependencies and classpath, and that the correct version is being used. Check for any typos in the code referring to the class.