FULL PRODUCT VERSION :
java version "9.0.1"
Java(TM) SE Runtime Environment (build 9.0.1+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.1+11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux SELAB-SERVER2 4.13.0-26-generic #29~16.04.2-Ubuntu SMP Tue Jan 9 22:00:44 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
It works in JDK8, but produces a bug in JDK9.


REGRESSION. Last worked in version 8u151

ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_151"
Java(TM) SE Runtime Environment (build 1.8.0_151-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode)

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Pass test

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.text.ParseException: Unparseable date: "س, جمادى الأولى 23, 1436"
at java.text.DateFormat.parse(DateFormat.java:366)
at edu.utsa.cs.test4incomp.test3.parseDate(test3.java:47)
at edu.utsa.cs.test4incomp.test3.formatWithArabicLocale(test3.java:31)
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 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)



REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import static org.junit.Assert.*;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URISyntaxException;
import java.net.URL;
import java.security.CodeSource;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Locale;
import java.util.TimeZone;

import org.junit.Assert;
import org.junit.Test;

public class test3 {

public static Locale en = new Locale("en");
public static Locale ar = new Locale("ar");



@Test
public void formatWithArabicLocale() throws ParseException {


Calendar uCal = parseDate("1436-5-23", "y-M-d", ar);
uCal = parseDate("س, جمادى الأولى 23, 1436", "E, MMMM d, y", ar);
assertEquals(" 'س, جمادى الأولى 23, 1436' should parse using 'E, MMMM d, y' format",
"1436-5-23",
String.format("%d-%d-%d", uCal.get(Calendar.YEAR), uCal.get(Calendar.MONTH) + 1, uCal.get(Calendar.DAY_OF_MONTH)));

}

public Calendar parseDate(String dateText, String fmt, Locale l) throws ParseException {
Calendar uCal = Calendar.getInstance();

SimpleDateFormat dateFormat = new SimpleDateFormat(fmt, l);
dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
dateFormat.setCalendar(uCal);
uCal.set(Calendar.YEAR, 1420);
dateFormat.set2DigitYearStart(uCal.getTime());

uCal.setTime(dateFormat.parse(dateText));
return uCal;
}
}

---------- END SOURCE ----------

SUPPORT :
YES