auth.java

String privateKey = System.getenv().get("OCI_PRIVATE_KEY_FILE_NAME");
Supplier<InputStream> privateKeySupplier = () -> {
 InputStream is = null;
 String ociPrivateKeyPath = "/function/" + privateKey;
 System.err.println("Private key location - " + ociPrivateKeyPath);

 try {
  is = new FileInputStream(ociPrivateKeyPath);
 } catch (FileNotFoundException ex) {
   System.err.println("Problem accessing OCI private key at " + ociPrivateKeyPath + " - " + ex.getMessage());
 }
 return is;
 };