Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/apache/http/impl/client/HttpClients

This error message indicates that a class called "org/apache/http/impl/client/HttpClients" could not be found during the initialization of a Java method. This class is part of the Apache HTTP client library, which is used for sending HTTP requests from Java applications.

To resolve this error, you will need to make sure that the Apache HTTP client library is included in your Java application's classpath. This usually involves adding a dependency for the library in your project's build file (e.g. pom.xml for Maven projects or build.gradle for Gradle projects).

If you are using an IDE such as Eclipse or IntelliJ IDEA, you can also add the library as a dependency directly in your project's configuration settings.

Once the library is included in your project's classpath, the "org/apache/http/impl/client/HttpClients" class should be available and the initialization of the affected method should succeed.