Answers for "com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes."

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.

You need to add your package!

<init-param>
  <param-name>com.sun.jersey.config.property.packages</param-name>
  <param-value>my.package.name</param-value>
</init-param>