call: Call,
    ioe: IOException,
  ) = onEvent(ResponseFailed(System.nanoTime(), call, ioe))

  override fun callEnd(call: Call) = onEvent(CallEnd(System.nanoTime(), call))

  override fun callFailed(
    call: Call,
    ioe: IOException,
  ) = onEvent(CallFailed(System.nanoTime(), call, ioe))

  override fun canceled(call: Call) = onEvent(Canceled(System.nanoTime(), call))

  override fun satisfactionFailure(

                // dump things out
                System.out.println("===================================================");
                System.out.println("args: " + Arrays.toString(mvnArgs.toArray()));
                System.out.println("===================================================");
                System.out.println("stdout: " + stdout);
                System.out.println("===================================================");

                "test-grp", "test-artifact-5", VersionRange.createFromVersion("1.0"), "type", null, "system", "system");

        assertEquals("system", artifact.getScope());
        assertEquals("system", artifact2.getScope());
        assertEquals("system", artifact3.getScope());
        assertEquals("system", artifact4.getScope());
        assertEquals("system", artifact5.getScope());
    }

Bir veri doğrulama sistemi olmazsa bütün bu kontrolleri koda dökerek kendiniz yapmak zorunda kalırdınız.

import com.google.common.annotations.GwtIncompatible;
import org.jspecify.annotations.Nullable;

/**
 * Represents a {@linkplain System#getProperties() standard system property}.
 *
 * @author Kurt Alfred Kluever
 * @since 15.0
 */
@GwtIncompatible // java.lang.System#getProperty
public enum StandardSystemProperty {

  /** Java Runtime Environment version. */
  JAVA_VERSION("java.version"),

    if (future.isDone()) {
      return;
    }
    long timeoutSeconds = timeoutSeconds();
    long deadline = System.nanoTime() + SECONDS.toNanos(timeoutSeconds);
    do {
      System.runFinalization();
      if (future.isDone()) {
        return;
      }
      System.gc();
      try {
        future.get(1L, SECONDS);
        return;
      } catch (CancellationException | ExecutionException ok) {

            System.err.println("ERROR: Failed to read .mvn/jvm.config: " + e.getMessage());
            System.err.println("Please check file permissions and syntax.");
            System.err.flush();
            System.exit(1);
        }
    }

    /**
     * Parse jvm.config file and return formatted arguments.
     * Package-private for testing.
     */

        System.out.printf("%.2f Executing call.%n", (System.nanoTime() - startNanos) / 1e9f)
        try {
          call.execute().use { response ->
            System.out.printf("%.2f Call was expected to fail, but completed: %s%n",
                (System.nanoTime() - startNanos) / 1e9f, response)
          }
        } catch (e: IOException) {
          System.out.printf("%.2f Call failed as expected: %s%n",

        for (GroupAnalysis group : sortedGroups) {
            System.out.printf("%nPaths ending with '%s':%n", group.name);
            System.out.printf("Total potential savings: %dKB%n", group.totalSavings / 1024);
            System.out.printf("Total memory: %dKB%n", group.totalMemory / 1024);
            System.out.printf("Total unique values: %d%n", group.totalUnique);
            System.out.printf("Total occurrences: %d%n", group.totalOccurrences);

 */
package okhttp3

import java.net.InetAddress
import java.net.UnknownHostException
import okhttp3.Dns.Companion.SYSTEM

/**
 * A domain name service that resolves IP addresses for host names. Most applications will use the
 * [system DNS service][SYSTEM], which is the default. Some applications may provide their own
 * implementation to use a different DNS server, to prefer IPv6 addresses, to prefer IPv4 addresses,