LambdaFileEncodingSerialization.java failed "exitCode = 1 expected [true] but found [false]"

The following test failed in the JDK16 CI:

java/lang/invoke/lambda/LambdaFileEncodingSerialization.java

Here's a snippet from the log file:

----------System.out:(58/4382)----------
[TestNG] Running:
  java/lang/invoke/lambda/LambdaFileEncodingSerialization.java

Command line: [/opt/mach5/mesos/work_dir/jib-master/install/jdk-16+5-159/linux-x64-open.jdk/jdk-16/bin/javac -J-Dfile.encoding=ISO-8859-1 -cp . -d . /opt/mach5/mesos/work_dir/jib-master/install/jdk-16+5-159/src.full/open/test/jdk/java/lang/invoke/lambda/TestLambdaFileEncodingSerialization.java]
[2020-07-08T13:51:48.641659167Z] Gathering output for process 3965121
[2020-07-08T13:51:50.212157144Z] Waiting for completion for process 3965121
[2020-07-08T13:51:50.212651065Z] Waiting for completion finished for process 3965121
Output and diagnostic info for process 3965121 was saved into 'pid-3965121-output.log'
/opt/mach5/mesos/work_dir/jib-master/install/jdk-16+5-159/src.full/open/test/jdk/java/lang/invoke/lambda/TestLambdaFileEncodingSerialization.java:38: error: error while writing ABC???: bad filename RelativeFile[TestLambdaFileEncodingSerialization$ABC???.class]
        public static class ABC???? implements Serializable {
                      ^
Note: /opt/mach5/mesos/work_dir/jib-master/install/jdk-16+5-159/src.full/open/test/jdk/java/lang/invoke/lambda/TestLambdaFileEncodingSerialization.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error


[2020-07-08T13:51:50.215963602Z] Waiting for completion for process 3965121
[2020-07-08T13:51:50.216451642Z] Waiting for completion finished for process 3965121
test LambdaFileEncodingSerialization.testDeserializeLambdaEncoding(): failure
java.lang.AssertionError: Command /opt/mach5/mesos/work_dir/jib-master/install/jdk-16+5-159/linux-x64-open.jdk/jdk-16/bin/javac -J-Dfile.encoding=ISO-8859-1 -cp . -d . /opt/mach5/mesos/work_dir/jib-master/install/jdk-16+5-159/src.full/open/test/jdk/java/lang/invoke/lambda/TestLambdaFileEncodingSerialization.java , failed exitCode = 1 expected [true] but found [false]
at org.testng.Assert.fail(Assert.java:94)
at org.testng.Assert.failNotEquals(Assert.java:496)
at org.testng.Assert.assertTrue(Assert.java:42)
at LambdaFileEncodingSerialization.testDeserializeLambdaEncoding(LambdaFileEncodingSerialization.java:64)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:832)

===============================================
java/lang/invoke/lambda/LambdaFileEncodingSerialization.java
Total tests run: 1, Failures: 1, Skips: 0
===============================================

----------System.err:(19/1310)----------


Since this is a Tier1 failure, I'm starting this bug at P2.