Submitter has updated JDK from jdk 1.8.0.241 to jdk 1.8.0.251, using okhttp3
(3.13.1) for sending http request, after jdk upgrade okhttp3 call is failing
with AssertionError "failed to get ALPN selected protocol"

Detailed stacktrace :

Exception in thread "main" java.lang.AssertionError: failed to get ALPN selected protocol
at okhttp3.internal.platform.Jdk9Platform.getSelectedProtocol(Jdk9Platform.java:68)
at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:347)
at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:284)
at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:169)
at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257)
at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:94)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:125)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:264)
at okhttp3.RealCall.execute(RealCall.java:93)
at testokhttp.DemoCasImpl3.main(DemoCasImpl3.java:140)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at okhttp3.internal.platform.Jdk9Platform.getSelectedProtocol(Jdk9Platform.java:58)
... 20 more
Caused by: java.lang.UnsupportedOperationException
at javax.net.ssl.SSLSocket.getApplicationProtocol(SSLSocket.java:691)

With jdk 1.8.0.241, okhttp3 call works fine.

***NOTE***
indication of possible regression.

8u251 Release Notes mentions the following
JDK 8u251 RN
https://www.oracle.com/technetwork/java/javase/8u251-relnotes-5972664.html

New Features
security-libs/javax.net.ssl
➜ TLS Application-Layer Protocol Negotiation Extension

JEP 244 has enhanced the Java Secure Socket Extension (JSSE) to provide
support for the TLS Application-Layer Protocol Negotiation Extension (RFC
7301). New methods have been added to the javax.net.ssl classes SSLEngine,
SSLSocket, and SSLParameters to allow clients and servers to negotiate an
application layer value as part of the TLS handshake.
See JDK-8051498 / JDK-8230977