Spring Boot Static Folder In Docker
There are two formats that can be used when you do local file handling of resources
file:abc/xyz and file:///abc/xyz.
file:abc/xyz means you want to serve from a relative path abc/xyz.
file:///abc/xyz means you want to serve from an absolute path /abc/xyz.
In your case user.dir was probably / inside the docker container making the path as file://pictures. Because of which the FTP handler was being activated by Java