append
Append contents to a resource in the jar.
e.g. append("resources/application.yml", "\n---\n") for merging resources/application.yml files.
Warning: In most cases, this should be used with the correct getDuplicatesStrategy to ensure duplicate extension module files are handled properly. See more details in the Handling Duplicates Strategy section.
Parameters
resource
The path to the resource in the jar.
separator
The separator to use between the original content and the appended content, defaults to AppendingTransformer.DEFAULT_SEPARATOR (\n).