Settings settings = new Settings();
        Proxy proxy = new Proxy();
        String id = "foo";
        proxy.setId(id);
        proxy.setHost("www.example.com");
        settings.addProxy(proxy);
        settings.addProxy(proxy);

        SimpleProblemCollector problems = new SimpleProblemCollector();
        validator.validate(settings, problems);
        assertEquals(1, problems.messages.size());

import java.net.Proxy
import java.net.ProxySelector
import java.net.SocketAddress
import java.net.URI

class FakeProxySelector : ProxySelector() {
  val proxies: MutableList<Proxy> = mutableListOf()

  fun addProxy(proxy: Proxy): FakeProxySelector {
    proxies.add(proxy)
    return this
  }

  override fun select(uri: URI): List<Proxy> {
    // Don't handle 'socket' schemes, which the RI's Socket class may request (for SOCKS).

        for (Proxy proxy : settings.getProxies()) {
            if (!proxy.isActive()) {
                continue;
            }

            proxy = proxy.clone();

            request.addProxy(proxy);
        }

        // <mirrors>
        //   <mirror>
        //     <id>nexus</id>
        //     <mirrorOf>*</mirrorOf>
        //     <url>http://repository.sonatype.org/content/groups/public</url>

            }
        } catch (ComponentLookupException e) {
            // no ide workspace artifact resolution
        }

        return artifactResolver.resolve(request);
    }

    //    public void addProxy( String protocol, String host, int port, String username, String password,
    //                          String nonProxyHosts )
    //    {
    //        ProxyInfo proxyInfo = new ProxyInfo();

     */
    ProfileActivation getProfileActivation();

    // Proxies
    List<Proxy> getProxies();

    MavenExecutionRequest setProxies(List<Proxy> proxies);

    MavenExecutionRequest addProxy(Proxy proxy);

    // Servers
    List<Server> getServers();

    MavenExecutionRequest setServers(List<Server> servers);

    MavenExecutionRequest addServer(Server server);

    // Mirrors

            this.proxies = new ArrayList<>(proxies);
        } else {
            this.proxies = null;
        }

        return this;
    }

    @Override
    public MavenExecutionRequest addProxy(Proxy proxy) {
        Objects.requireNonNull(proxy, "proxy cannot be null");

        for (Proxy p : getProxies()) {
            if (p.getId() != null && p.getId().equals(proxy.getId())) {
                return this;

public org.apache.maven.wagon.proxy.ProxyInfo getProxy(String); public org.apache.maven.wagon.authentication.AuthenticationInfo getAuthenticationInf(String); public org.apache.maven.artifact.repository.ArtifactRepository getMirror(String); public void addProxy(String, String, int, String, String, String); public void contextualize(org.codehaus.plexus.context.Context) throws org.codehaus.plexus.context.ContextException; public void setDownloadMonitor(org.apache.maven.wagon.events.TransferListener); public...

public org.apache.maven.wagon.proxy.ProxyInfo getProxy(String); public org.apache.maven.wagon.authentication.AuthenticationInfo getAuthenticationInf(String); public org.apache.maven.artifact.repository.ArtifactRepository getMirror(String); public void addProxy(String, String, int, String, String, String); public void contextualize(org.codehaus.plexus.context.Context) throws org.codehaus.plexus.context.ContextException; public void setDownloadMonitor(org.apache.maven.wagon.events.TransferListener); public...

    client =
      client.newBuilder()
        .proxySelector(
          FakeProxySelector()
            .addProxy(server2.toProxyAddress())
            .addProxy(Proxy.NO_PROXY),
        )
        .build()
    server2.shutdown()
    val request =
      Request(
        url = server.url("/"),

    // Use a misconfigured proxy to guarantee that the request is retried.
    client =
      client.newBuilder()
        .proxySelector(
          FakeProxySelector()
            .addProxy(server2.toProxyAddress())
            .addProxy(Proxy.NO_PROXY),
        )
        .build()
    server2.shutdown()
    val request =
      Request(
        url = server.url("/def"),