public final Object mutex = new Object[0]; // something Serializable

  protected <K, V> Map<K, V> create() {
    TestMap<K, V> inner = new TestMap<>(new HashMap<K, V>(), mutex);
    Map<K, V> outer = Synchronized.map(inner, mutex);
    return outer;
  }

  static class TestMap<K, V> extends ForwardingMap<K, V> implements Serializable {
    public final Object mutex;
    private final Map<K, V> delegate;

Cleanup_ for a safe and fast upgrade.


Backwards-Incompatible Changes
------------------------------

#### OkHttpClient final methods

`OkHttpClient` has 26 accessors like `interceptors()` and `writeTimeoutMillis()` that were non-final
in OkHttp 3.x and are final in 4.x. These were made non-final for use with mocking frameworks like
[Mockito][mockito]. We believe subtyping `OkHttpClient` is the wrong way to test with OkHttp. If

    void testBackupSecurityInfo() {
        assertEquals(0x1000, SecurityInfo.BACKUP_SECURITY_INFO);
    }

    @Test
    @DisplayName("Test all constants are public static final")
    void testConstantsArePublicStaticFinal() {
        Field[] fields = SecurityInfo.class.getDeclaredFields();

        for (Field field : fields) {
            int modifiers = field.getModifiers();

import java.util.SortedSet;
import junit.framework.TestSuite;

/**
 * Creates, based on your criteria, a JUnit test suite that exhaustively tests a NavigableSet
 * implementation.
 */
@GwtIncompatible
public final class NavigableSetTestSuiteBuilder<E> extends SortedSetTestSuiteBuilder<E> {
  public static <E> NavigableSetTestSuiteBuilder<E> using(TestSortedSetGenerator<E> generator) {

 *
 * MS-SMB2 2.2.14.2.10
 */
public class LeaseV1CreateContextResponse implements CreateContextResponse {

    /**
     * Context name for lease response
     */
    public static final String CONTEXT_NAME = "RqLs";

    private static final byte[] CONTEXT_NAME_BYTES = CONTEXT_NAME.getBytes();

    private Smb2LeaseKey leaseKey;
    private int leaseState;
    private int leaseFlags;

    /**

            return realm;
        }

        public DependencyFilter getExtensionArtifactFilter() {
            return extensionArtifactFilter;
        }

        private final ClassRealm realm;

        private final DependencyFilter extensionArtifactFilter;

        CacheRecord(ClassRealm realm, DependencyFilter extensionArtifactFilter) {
            this.realm = realm;

import org.jspecify.annotations.NullUnmarked;

/**
 * Tester for typical subclass of {@link ForwardingObject} by using Mockito.
 *
 * @author Ben Yu
 */
@NullUnmarked
final class ForwardingObjectTester {

  private static final Method DELEGATE_METHOD;

  static {
    try {
      DELEGATE_METHOD = ForwardingObject.class.getDeclaredMethod("delegate");
      DELEGATE_METHOD.setAccessible(true);

 * </pre>
 *
 * @author Kevin Bourrillion
 * @since 10.0
 */
@GwtCompatible
@NullMarked
public class TestLogHandler extends Handler {
  private final Object lock = new Object();

  /** We will keep a private list of all logged records */
  @GuardedBy("lock")
  private final List<LogRecord> list = new ArrayList<>();

  /** Adds the most recently logged record to our list. */
  @Override

package okhttp3.recipes;

import java.io.IOException;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public final class PostForm {
  private final OkHttpClient client = new OkHttpClient();

  public void run() throws Exception {
    RequestBody formBody = new FormBody.Builder()
        .add("search", "Jurassic Park")
        .build();

 */
public class BuildResumptionData {
    /**
     * The list of projects that remain to be built.
     */
    private final List<String> remainingProjects;

    public BuildResumptionData(final List<String> remainingProjects) {
        this.remainingProjects = remainingProjects;
    }

    /**
     * Returns the projects that still need to be built when resuming.