return extensionContainer.getByType(FlavorContainer.class);
        }

        @Mutate
        public void registerNativePlatformResolver(PlatformResolvers resolvers, ServiceRegistry serviceRegistry) {
            resolvers.register(serviceRegistry.get(NativePlatformResolver.class));
        }

        @Defaults

    /**
     * Returns true if this version has a method for tests display names
     */
    boolean isHasTestDisplayNames();

    /**
     * Returns true if this version supports custom toolchain resolvers.
     */
    boolean isSupportsCustomToolchainResolvers();

    /**
     * Returns true if this version uses the non-flaky toolchain provisioning mechanism introduced in 8.9.
     */

// An example implementation of a client.

package main

import (
	"context"
	"fmt"
	"net/url"
	"os"
	"strings"
	"time"

	"github.com/spf13/cobra"
	// To install the xds resolvers and balancers.
	_ "google.golang.org/grpc/xds"
	wrappers "google.golang.org/protobuf/types/known/wrapperspb"

	"istio.io/istio/pkg/cmd"
	"istio.io/istio/pkg/log"
	"istio.io/istio/pkg/test/echo/common"

package grpcgen_test

import (
	"context"
	"fmt"
	"math"
	"net"
	"runtime"
	"strconv"
	"sync"
	"testing"
	"time"

	"google.golang.org/grpc"
	//  To install the xds resolvers and balancers.
	_ "google.golang.org/grpc/xds"

	networking "istio.io/api/networking/v1alpha3"
	"istio.io/istio/pilot/test/xds"
	"istio.io/istio/pkg/config"
	"istio.io/istio/pkg/config/protocol"

    Type resolvedRawType = resolveType(type.getRawType());

    Type[] args = type.getActualTypeArguments();
    Type[] resolvedArgs = resolveTypes(args);
    return Types.newParameterizedTypeWithOwner(
        resolvedOwner, (Class<?>) resolvedRawType, resolvedArgs);
  }

  private static <T> T expectArgument(Class<T> type, Object arg) {
    try {
      return type.cast(arg);

    Type resolvedRawType = resolveType(type.getRawType());

    Type[] args = type.getActualTypeArguments();
    Type[] resolvedArgs = resolveTypes(args);
    return Types.newParameterizedTypeWithOwner(
        resolvedOwner, (Class<?>) resolvedRawType, resolvedArgs);
  }

  private static <T> T expectArgument(Class<T> type, Object arg) {
    try {
      return type.cast(arg);

// The returned EnvSet has the same compatibility version as the EnvSet that was extended.
//
// Extend is an expensive operation and each call to Extend that adds DeclTypes increases
// the depth of a chain of resolvers. For these reasons, calls to Extend should be kept
// to a minimum.
//
// Some best practices:
//
//   - Minimize calls Extend when handling API requests. Where possible, call Extend

		// but that is a detail of the specific lookup mechanism.
		// Other lookups might allow broader name syntax
		// (for example Multicast DNS allows UTF-8; see RFC 6762).
		// For consistency with libc resolvers, report no such host.
		return dnsmessage.Parser{}, "", newDNSError(errNoSuchHost, name, "")
	}

	if conf == nil {
		conf = getSystemDNSConfig()
	}

	var (
		p      dnsmessage.Parser

	dnsConfig, err := dns.ClientConfigFromFile(resolvConf)
	if err != nil {
		log.Warnf("failed to load %s: %v", resolvConf, err)
		return nil, err
	}

	// Unlike traditional DNS resolvers, we do not need to append the search
	// namespace to a given query and try to resolve it. This is because the
	// agent acts as a DNS interceptor for DNS queries made by the application.

include::sample[dir="snippets/java/toolchain-foojay/groovy/",files="settings.gradle[tags=plugin-application]"]
====

In general, when applying toolchain resolver plugins, the toolchain download resolvers provided by them also need to be configured.
Let's illustrate with an example.
Consider two toolchain resolver plugins applied by the build: