for (PlexusConfiguration property : properties) {
                            headers.put(
                                    property.getChild("name").getValue(),
                                    property.getChild("value").getValue());
                        }
                    }
                }

                PlexusConfiguration connectTimeoutXml = config.getChild("connectTimeout", false);

        keptAccessors.entrySet().removeIf(e -> {
            if (seenUpgradedAccessorsChanges.contains(e.getKey())) {
                return true;
            }
            ReplacedAccessor accessor = e.getValue();
            return accessor.getBinaryCompatibility() == BinaryCompatibility.ACCESSORS_KEPT;
        });
        if (!keptAccessors.isEmpty()) {

        return upgradedProperties.stream()
            .flatMap(UpgradePropertiesRuleSetup::mapOldAccessorsOfUpgradedProperty)
            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
    }

    private static Stream<Map.Entry<AccessorKey, ReplacedAccessor>> mapOldAccessorsOfUpgradedProperty(UpgradedProperty upgradedProperty) {
        return upgradedProperty.getReplacedAccessors().stream()

      K key = entry.getKey();
      Collection<V> collection = filterCollection(entry.getValue(), new ValuePredicate(key));
      if (!collection.isEmpty()
          && predicate.apply(Maps.<K, Collection<V>>immutableEntry(key, collection))) {
        if (collection.size() == entry.getValue().size()) {
          entryIterator.remove();
        } else {
          collection.clear();
        }

        assertNotNull(resolved);
        assertNotNull(resolved.getKey());
        assertNotNull(resolved.getValue());
        Optional<Path> op = session.getArtifactPath(resolved.getKey());
        assertTrue(op.isPresent());
        assertEquals(resolved.getValue(), op.get());
    }

    @Test
    void testBuildProject() {

    K key1 = entry1.getKey();
    V value1 = entry1.getValue();
    checkEntryNotNull(key1, value1);
    // Do something that works for j2cl, where we can't call getDeclaredClass():
    EnumMap<K, V> enumMap = new EnumMap<>(singletonMap(key1, value1));
    while (entryItr.hasNext()) {
      Entry<K, ? extends V> entry = entryItr.next();
      K key = entry.getKey();
      V value = entry.getValue();
      checkEntryNotNull(key, value);

            super(session, repositorySystem, repositories, resolverRepositories, lookup);
            systemProperties = System.getenv().entrySet().stream()
                    .collect(Collectors.toMap(e -> "env." + e.getKey(), e -> e.getValue()));
        }

        @Override
        protected Session newSession(RepositorySystemSession session, List<RemoteRepository> repositories) {

            Object value = null;

            PlexusConfiguration config = configuration.getChild(parameter.getName(), false);
            if (config != null) {
                String expression = config.getValue(null);

                try {
                    value = expressionEvaluator.evaluate(expression);

                    if (value == null) {

        if (properties != null && !properties.isEmpty()) {
            return properties.entrySet().stream()
                    .collect(Collectors.toMap(e -> String.valueOf(e.getKey()), e -> String.valueOf(e.getValue())));

        } else {
            return null;
        }
    }

    @SuppressWarnings("unchecked")
    static <T extends Throwable> void uncheckedThrow(Throwable t) throws T {