$ java --version                                                                                                                                      sgopal1@m-c02xd0kqjgh7
openjdk 17-loom 2021-09-14
OpenJDK Runtime Environment (build 17-loom+7-342)
OpenJDK 64-Bit Server VM (build 17-loom+7-342, mixed mode, sharing)
// OkHttp
implementation(platform("com.squareup.okhttp3:okhttp-bom:4.9.0"))
implementation("com.squareup.okhttp3:okhttp")
Throws the following error when trying to create an OkHttpClient on JDK17-ea build with strong encapsulation enabled.
java.lang.reflect.InaccessibleObjectException: Unable to make field private final sun.security.ssl.SSLContextImpl sun.security.ssl.SSLSocketFactoryImpl.context accessible: module java.base does not "opens sun.security.ssl" to unnamed module @3a44f074
        at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
        at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
        at java.base/java.lang.reflect.Field.checkCanSetAccessible(Field.java:177)
        at java.base/java.lang.reflect.Field.setAccessible(Field.java:171)
        at okhttp3.internal.Platform.readFieldOrNull(Platform.java:417)
        at okhttp3.internal.Platform.trustManager(Platform.java:91)
        at okhttp3.OkHttpClient.<init>(OkHttpClient.java:184)
        at okhttp3.OkHttpClient.<init>(OkHttpClient.java:60)
        at okhttp3.OkHttpClient$Builder.build(OkHttpClient.java:718)
        at se.bjurr.gitchangelog.internal.integrations.github.GitHubServiceFactory.getGitHubService(GitHubServiceFactory.java:55)
Have to explicitly open this package for reflection in all (--add-​opens java.base/sun.security.ssl=ALL-UNNAMED) the programs for okhttp to work properly.
Source: https://github.com/square/okhttp/blob/master/okhttp/src/main/kotlin/okhttp3/internal/platform/Platform.kt#L93
          
Looks like a clean fix is to log and swallow this exception
          open fun trustManager(sslSocketFactory: SSLSocketFactory): X509TrustManager? {
            return try {
              // Attempt to get the trust manager from an OpenJDK socket factory. We attempt this on all
              // platforms in order to support Robolectric, which mixes classes from both Android and the
              // Oracle JDK. Note that we don't support HTTP/2 or other nice features on Robolectric.
              val sslContextClass = Class.forName("sun.security.ssl.SSLContextImpl")
              val context = readFieldOrNull(sslSocketFactory, sslContextClass, "context") ?: return null
              readFieldOrNull(context, X509TrustManager::class.java, "trustManager")
            } catch (e: ClassNotFoundException) {
          
@sureshg Something is off with the java files and line numbers in your stacktrace.  Can you easily test if we give you a snapshot?
https://github.com/square/okhttp/blob/parent-4.9.0/okhttp/src/main/kotlin/okhttp3/OkHttpClient.kt#L184
Something is off with the java files
@yschimke My bad, yes you are correct. The issue is due to an old OKHttp dependency used in the Gradle plugin. I did test the latest  OKHttp release on JDK 18 and it's running smoothly without any issues/warnings  👍🏼 .

Here is the link JDK18 github action run logs on win/linux/macos  - https://github.com/sureshg/okhttp-jdk-test/runs/2836840606?check_suite_focus=true
Again, really sorry for the inconvenience caused.
          
I don't think it's trivial to test for this, as I suspect that the Gradle 7.2 + Junit code needs to avoid this anyway.
package okhttp3;
import org.junit.jupiter.api.Test;
import javax.net.ssl.SSLSocketFactory;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class Jdk17Test {
    @Test
    public void testDeprecatedSslSocketFactory() {
        // https://github.com/square/okhttp/issues/6694
        SSLSocketFactory factory = (SSLSocketFactory) SSLSocketFactory.getDefault();
        try {
            new OkHttpClient.Builder().sslSocketFactory(factory).build();
        } catch (UnsupportedOperationException uoe) {
            // expected
            assertEquals("clientBuilder.sslSocketFactory(SSLSocketFactory) not supported on " +
                    "JDK 8 (>= 252) or JDK 9+",
                    uoe.getMessage());
Is passing even if I disable the fix.