java.nio.file.FileSystemNotFoundException when getting file from resources folder

Question

I am getting this error on the following code (note that this does not happen on my local machine, only on my build server):

Files.readAllBytes(Paths.get(get         


        

Answer 1

If you use Spring, inject resources. Be it a file, or folder, or even multiple files, there are chances, you can do it via injection. Warning: DO NOT use File and Files.walk with the injected resources, otherwise you'll get FileSystemNotFoundException when running as JAR.

This example demonstrates the injection of multiple images located in static/img folder.

import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Service;
import javax.annotation.PostConstruct;

@Service
public class StackoverflowService {

    @Value("classpath:static/img/*")
    private Resource[] resources;
    private List filenames;

    @PostConstruct
    void init() {
        final Predicate isJPG = path -> path.endsWith(".jpg");
        final Predicate isPNG = path -> path.endsWith(".png");

        // iterate resources, filter by type and get filenames
        filenames = Arrays.stream(resources)
                .map(Resource::getFilename)
                .filter(isJPG.or(isPNG))
                .collect(Collectors.toList());
    }
}