java.io.FileNotFoundException:
class path resource [kwhRules.json] 
cannot be resolved to absolute file path because it does not reside in the file system: 
jar:file:/root/app/target/app.jar!/BOOT-INF/classes!/kwhRules.json

void initRules() throws IOException {
       var file = ResourceUtils.getFile("classpath:kwhRules.json");var ob = new ObjectMapper();
        this.rawRules = ob.readValue(file, Map.class);
}

void initRules() throws IOException {var classPathResource = new ClassPathResource("kwhRules.json");
        var ob = new ObjectMapper();
        this.rawRules = ob.readValue(classPathResource.getInputStream(), Map.class);
}