NullPointerException: Cannot read the array length because "<local9>" is null

The following test failed to execute in the JDK22 CI:

jdk/jfr/api/consumer/streaming/TestBaseRepositoryAfterStart.java

Here's the .jtr file for the test:

#Test Results (version 2)
#Sat Aug 26 16:24:39 UTC 2023
#-----testdescription-----
$file=C\:\\ade\\mesos\\work_dir\\jib-master\\install\\jdk-22+13-905\\src.full\\open\\test\\jdk\\jdk\\jfr\\api\\consumer\\streaming\\TestBaseRepositoryAfterStart.java
$root=C\:\\ade\\mesos\\work_dir\\jib-master\\install\\jdk-22+13-905\\src.full\\open\\test\\jdk
keywords=jfr othervm
library=/test/lib
modules=jdk.jfr java.management
requires=vm.hasJFR
run=USER_SPECIFIED build jdk.jfr.api.consumer.streaming.Application\r\nUSER_SPECIFIED main/othervm jdk.jfr.api.consumer.streaming.TestBaseRepositoryAfterStart\r\n
source=TestBaseRepositoryAfterStart.java
title=Test that it is possible to start a stream against a directory, specified on command, line before the application starts

#-----environment-----

#-----testresult-----
end=Sat Aug 26 16\:24\:39 UTC 2023
execStatus=Error. Unexpected exception caught from test jdk/jfr/api/consumer/streaming/TestBaseRepositoryAfterStart.java\: java.lang.NullPointerException\: Cannot read the array length because "<local9>" is null
sections=script_messages Details

#section:script_messages
----------messages:(0/0)----------

#section:Details
----------messages:(0/0)----------
----------Stack trace:(12/1061)----------
java.lang.NullPointerException: Cannot read the array length because "<local9>" is null
        at com.sun.javatest.regtest.exec.ScratchDirectory.deleteFiles(ScratchDirectory.java:215)
        at com.sun.javatest.regtest.exec.ScratchDirectory.deleteFiles(ScratchDirectory.java:217)
        at com.sun.javatest.regtest.exec.ScratchDirectory.deleteFiles(ScratchDirectory.java:217)
        at com.sun.javatest.regtest.exec.ScratchDirectory.deleteFilesWithRetry(ScratchDirectory.java:173)
        at com.sun.javatest.regtest.exec.ScratchDirectory.deleteFiles(ScratchDirectory.java:153)
        at com.sun.javatest.regtest.exec.ScratchDirectory$SimpleScratchDirectory.retainFiles(ScratchDirectory.java:389)
        at com.sun.javatest.regtest.exec.ScratchDirectory$ThreadSafeScratchDir.retainFiles(ScratchDirectory.java:451)
        at com.sun.javatest.regtest.exec.RegressionScript.run(RegressionScript.java:314)
        at com.sun.javatest.Script.run(Script.java:431)
        at com.sun.javatest.DefaultTestRunner.runTest(DefaultTestRunner.java:183)
        at com.sun.javatest.DefaultTestRunner$1.run(DefaultTestRunner.java:76)
result: Not run. Test running...


test result: Error. Unexpected exception caught from test jdk/jfr/api/consumer/streaming/TestBaseRepositoryAfterStart.java: java.lang.NullPointerException: Cannot read the array length because "<local9>" is null


The NPE in this test's execution attempt resulted in the following
confusing log entries:

[2023-08-26T16:24:32,679Z] --------------------------------------------------
[2023-08-26T16:24:34,562Z] TEST: jdk/jfr/api/consumer/security/TestStreamingRemote.java
[2023-08-26T16:24:34,562Z] build: 0.274 seconds
[2023-08-26T16:24:34,562Z] compile: 0.272 seconds
[2023-08-26T16:24:34,562Z] main: 6.281 seconds
[2023-08-26T16:24:34,562Z] TEST RESULT: Passed. Execution successful
[2023-08-26T16:24:34,562Z] --------------------------------------------------
[2023-08-26T16:24:39,113Z] TEST: jdk/jfr/api/consumer/streaming/TestBaseRepositoryAfterStart.java
[2023-08-26T16:24:42,067Z] TEST: jdk/jfr/api/consumer/streaming/TestChunkGap.java
[2023-08-26T16:24:42,067Z] build: 0.166 seconds
[2023-08-26T16:24:42,067Z] compile: 0.162 seconds
[2023-08-26T16:24:42,067Z] main: 6.964 seconds
[2023-08-26T16:24:42,067Z] TEST RESULT: Passed. Execution successful
[2023-08-26T16:24:42,067Z] --------------------------------------------------
[2023-08-26T16:24:42,068Z] TEST: jdk/jfr/api/consumer/streaming/TestBaseRepositoryBeforeStart.java
[2023-08-26T16:24:42,068Z] build: 0.478 seconds
[2023-08-26T16:24:42,068Z] compile: 0.473 seconds
[2023-08-26T16:24:42,068Z] build: 0.136 seconds
[2023-08-26T16:24:42,068Z] compile: 0.135 seconds
[2023-08-26T16:24:42,068Z] main: 9.056 seconds
[2023-08-26T16:24:42,068Z] TEST RESULT: Passed. Execution successful
[2023-08-26T16:24:42,068Z] --------------------------------------------------

Please note the beginning of an entry for:

TEST: jdk/jfr/api/consumer/streaming/TestBaseRepositoryAfterStart.java

and the missing "TEST RESULT:" line for that test.

It looks like jdk/jfr/api/consumer/streaming/TestBaseRepositoryAfterStart.java
should have started, but there's no build, compile, or main lines...

The test summary part of the log file looks like this:

[2023-08-26T16:40:50,008Z] ==============================
[2023-08-26T16:40:50,008Z] Test summary
[2023-08-26T16:40:50,008Z] ==============================
[2023-08-26T16:40:50,008Z] TEST TOTAL PASS FAIL ERROR
[2023-08-26T16:40:50,008Z] >> jtreg:open/test/jdk:jdk_svc 1298 1297 0 1 <<
[2023-08-26T16:40:50,008Z] ==============================
[2023-08-26T16:40:50,008Z] TEST FAILURE