Elasticsearch specific build logic is located in the `build-tools-internal` subproject including integration tests.

- Gradle plugins and Tasks should be written in Java
- We use a groovy and spock for setting up Gradle integration tests.
  (see https://github.com/elastic/elasticsearch/blob/master/build-tools/src/testFixtures/groovy/org/elasticsearch/gradle/fixtures/AbstractGradleFuncTest.groovy)

    <dependency>
      <groupId>eu.maveniverse.maven.domtrip</groupId>
      <artifactId>domtrip-maven</artifactId>
    </dependency>

    <dependency>
      <groupId>javax.inject</groupId>
      <artifactId>javax.inject</artifactId>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.eclipse.sisu</groupId>
      <artifactId>org.eclipse.sisu.inject</artifactId>

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.recipes.kt

import java.io.IOException
import okhttp3.Call
import okhttp3.Callback
import okhttp3.OkHttpClient
import okhttp3.Request
import okhttp3.Response

class AsynchronousGet {
  private val client = OkHttpClient()

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.tls

import java.security.cert.X509Certificate

fun interface TrustRootIndex {
  /** Returns the trusted CA certificate that signed [cert]. */
  fun findByIssuerAndSignature(cert: X509Certificate): X509Certificate?

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3

/**
 * Versions of TLS that can be offered when negotiating a secure socket. See
 * [javax.net.ssl.SSLSocket.setEnabledProtocols].
 */
enum class TlsVersion(
  @get:JvmName("javaName") val javaName: String,
) {
  TLS_1_3("TLSv1.3"), // 2016.
  TLS_1_2("TLSv1.2"), // 2008.
  TLS_1_1("TLSv1.1"), // 2006.

    val compileKotlinTask = tasks.getByName("compileKotlin") as KotlinJvmCompile
    dependsOn(compileKotlinTask)

    if (enableValidation) {
      compileKotlinTask.source(file("src/main/java9"))
    }

    // Ignore warnings about using 'requires transitive' on automatic modules.
    // not needed when compiling with recent JDKs, e.g. 17
    options.compilerArgs.add("-Xlint:-requires-transitive-automatic")

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package gradlebuild

import java.io.File

abstract class ProjectStructure {
    val architectureElements = mutableListOf<ArchitectureElementBuilder>()
    val projectBaseDirs = mutableListOf<File>()

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.cache

import java.io.IOException
import okio.Sink

interface CacheRequest {
  @Throws(IOException::class)
  fun body(): Sink

  fun abort()

import assertk.all
import assertk.assertFailure
import assertk.assertions.cause
import assertk.assertions.hasClass
import assertk.assertions.hasMessage
import assertk.assertions.isNotNull
import java.io.IOException
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.runners.JUnit4

/**
 * Android test running with only stubs.
 */
@RunWith(JUnit4::class)

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package okhttp3.internal.cache

import java.io.IOException
import okio.Buffer
import okio.ForwardingSink
import okio.Sink

/** A sink that never throws IOExceptions, even if the underlying sink does. */
internal open class FaultHidingSink(
  delegate: Sink,