ADDITIONAL SYSTEM INFORMATION :
Ubuntu 16.04 - be good if you could include linux as an option under Operating System above.
openjdk Version: 8u222-b10-1ubuntu1~16.04.1
openjdk Version: 8u232-b10-1ubuntu1~16.04.1

A DESCRIPTION OF THE PROBLEM :
Package openjdk-8-jre-headless Version:
8u222-b10-1ubuntu1~16.04.1 is missing
sun/security/validator/KeyStores.class from /usr/lib/jvm/java-8-openjdk-
amd64/jre/lib/rt.jar

Relevant jars for 8u222 are as follows

$ jar tvf /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar |grep 'sun/security/validator'
  858 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/CADistrustPolicy$1.class
  790 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/CADistrustPolicy$2.class
 2751 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/CADistrustPolicy.class
 7291 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/EndEntityChecker.class
10709 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/PKIXValidator.class
 9588 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/SimpleValidator.class
 4582 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/SymantecTLSPolicy.class
 1398 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/TrustStoreUtil.class
 4562 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/Validator.class
 2224 Thu Jul 18 20:27:16 SAST 2019 sun/security/validator/ValidatorException.class

Relevant jars for previous version 8u212 are as follows

$ jar tvf /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar |grep 'sun/security/validator'
  858 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/CADistrustPolicy$1.class
  790 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/CADistrustPolicy$2.class
 2751 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/CADistrustPolicy.class
 7291 Fri Apr 26 02:04:28 SAST 2019 sun/security/validator/EndEntityChecker.class
 1295 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/KeyStores.class
10709 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/PKIXValidator.class
 9588 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/SimpleValidator.class
 4582 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/SymantecTLSPolicy.class
 4557 Fri Apr 26 02:04:28 SAST 2019 sun/security/validator/Validator.class
 2224 Fri Apr 26 02:04:30 SAST 2019 sun/security/validator/ValidatorException.class

Looks like KeyStores.class has been replaced by TrustStoreUtil.class in
8u222

This causes the following issue after upgrading from 8u212 to 8u222

Exception in thread "main" java.lang.NoClassDefFoundError:
sun/security/validator/KeyStores

The class is also missing from openjdk 8u232

The problem has also been reported on launchpad.net as bug 1838645

REGRESSION : Last worked in version 8


CUSTOMER SUBMITTED WORKAROUND :
Extracting sun/security/validator/KeyStores.class from the java 8u212
rt.jar and updating the java 8u222 rt.jar solves the problem.

Eg. on the 8u222 (and 8u232) version do the following after extracting
KeyStores.class from the 8u212 rt.jar

jar uf /usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar
sun/security/validator/KeyStores.class


FREQUENCY : always