}

    private List<String> parsePluginExcludes(RepositorySystemSession session) {
        String excludes = ConfigUtils.getString(session, null, MAVEN_PLUGIN_VALIDATION_EXCLUDES_KEY);
        if (excludes == null || excludes.isEmpty()) {
            return Collections.emptyList();
        }
        return Arrays.stream(excludes.split(","))

                }
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    @Override
    public Optional<String> getString(URI relativeSource, Charset charset) {
        requireNonNull(charset, "charset is null");
        Optional<byte[]> data = getBytes(relativeSource);
        return data.map(bytes -> new String(bytes, charset));
    }

            String userAgent = ConfigUtils.getString(
                    legacySupport.getRepositorySession(), null, ConfigurationProperties.USER_AGENT);

            if (userAgent == null) {
                Properties headers = new Properties();

                headers.put(
                        "User-Agent",
                        ConfigUtils.getString(

     * @throws RuntimeException If failed (and not due source not exists).
     */
    @Nonnull
    default Optional<String> getString(@Nonnull URI relativeSource) {
        return getString(relativeSource, StandardCharsets.UTF_8);
    }

    /**
     * PUTs the source file (must exist as file) to target URI. The target MUST BE relative from the

                }
            }
        } catch (IOException e) {
            throw new UncheckedIOException(e);
        }
    }

    @Override
    public Optional<String> getString(URI relativeSource, Charset charset) {
        requireNonNull(charset, "charset is null");
        Optional<byte[]> data = getBytes(relativeSource);
        return data.map(bytes -> new String(bytes, charset));
    }