jdk16 Hotspot extended.openjdk: ERROR: Graal library directory is not specified

Looks like a hotspot Graal setup issue?
https://ci.adoptopenjdk.net/job/Test_openjdk16_hs_extended.openjdk_x86-64_linux/9/consoleFull
```
11:46:43 TEST: compiler/graalunit/ApiDirectivesTest.java
11:46:43 TEST JDK: /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image
11:46:43
11:46:43 ACTION: build -- Passed. Build successful
11:46:43 REASON: Named class compiled on demand
11:46:43 TIME: 0.105 seconds
11:46:43 messages:
11:46:43 command: build compiler.graalunit.common.GraalUnitTestLauncher
11:46:43 reason: Named class compiled on demand
11:46:43 Library /:
11:46:43 compile: compiler.graalunit.common.GraalUnitTestLauncher
11:46:43 elapsed time (seconds): 0.105
11:46:43
11:46:43 ACTION: compile -- Passed. Compilation successful
11:46:43 REASON: .class file out of date or does not exist
11:46:43 TIME: 0.105 seconds
11:46:43 messages:
11:46:43 command: compile /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit/common/GraalUnitTestLauncher.java
11:46:43 reason: .class file out of date or does not exist
11:46:43 Additional options from @modules: --add-modules jdk.internal.vm.compiler
11:46:43 Mode: agentvm
11:46:43 Agent id: 1
11:46:43 elapsed time (seconds): 0.105
11:46:43 configuration:
11:46:43 Boot Layer (javac runtime environment)
11:46:43 class path: /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/jvmtest/openjdk/jtreg/lib/javatest.jar
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/jvmtest/openjdk/jtreg/lib/jtreg.jar
11:46:43 patch: java.base /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/patches/java.base
11:46:43
11:46:43 javac compilation environment
11:46:43 add modules: jdk.internal.vm.compiler
11:46:43 source path: /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/lib
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg
11:46:43 class path: /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0
11:46:43
11:46:43 rerun:
11:46:43 cd /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/scratch/0 && \
11:46:43 DISPLAY=:0 \
11:46:43 HOME=/home/jenkins \
11:46:43 PATH=/bin:/usr/bin:/usr/sbin \
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image/bin/javac \
11:46:43 -J-ea \
11:46:43 -J-esa \
11:46:43 -J-Xmx512m \
11:46:43 -J-XX:-UseCompressedOops \
11:46:43 -J-Djava.library.path=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/openjdk-test-image/hotspot/jtreg/native \
11:46:43 -J-Dtest.vm.opts='-ea -esa -Xmx512m -XX:-UseCompressedOops' \
11:46:43 -J-Dtest.tool.vm.opts='-J-ea -J-esa -J-Xmx512m -J-XX:-UseCompressedOops' \
11:46:43 -J-Dtest.compiler.opts= \
11:46:43 -J-Dtest.java.opts= \
11:46:43 -J-Dtest.jdk=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image \
11:46:43 -J-Dcompile.jdk=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image \
11:46:43 -J-Dtest.timeout.factor=8.0 \
11:46:43 -J-Dtest.nativepath=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/openjdk-test-image/hotspot/jtreg/native \
11:46:43 -J-Dtest.root=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg \
11:46:43 -J-Dtest.name=compiler/graalunit/ApiDirectivesTest.java \
11:46:43 -J-Dtest.file=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit/ApiDirectivesTest.java \
11:46:43 -J-Dtest.src=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit \
11:46:43 -J-Dtest.src.path=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg \
11:46:43 -J-Dtest.classes=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit/ApiDirectivesTest.d \
11:46:43 -J-Dtest.class.path=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit/ApiDirectivesTest.d:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0 \
11:46:43 -J-Dtest.class.path.prefix=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0 \
11:46:43 -J-Dtest.modules=jdk.internal.vm.compiler \
11:46:43 --add-modules jdk.internal.vm.compiler \
11:46:43 -d /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0 \
11:46:43 -sourcepath /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg \
11:46:43 -classpath /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit/common/GraalUnitTestLauncher.java
11:46:43 direct:
11:46:43 Note: /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit/common/GraalUnitTestLauncher.java uses unchecked or unsafe operations.
11:46:43 Note: Recompile with -Xlint:unchecked for details.
11:46:43
11:46:43 ACTION: main -- Failed. Execution failed: `main' threw exception: java.lang.ExceptionInInitializerError
11:46:43 REASON: User specified action: run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.graalunit.common.GraalUnitTestLauncher -prefix org.graalvm.compiler.api.directives.test -exclude ${test.root}/ProblemList-graal.txt
11:46:43 TIME: 0.291 seconds
11:46:43 messages:
11:46:43 command: main -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.graalunit.common.GraalUnitTestLauncher -prefix org.graalvm.compiler.api.directives.test -exclude /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/ProblemList-graal.txt
11:46:43 reason: User specified action: run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI compiler.graalunit.common.GraalUnitTestLauncher -prefix org.graalvm.compiler.api.directives.test -exclude ${test.root}/ProblemList-graal.txt
11:46:43 Mode: othervm [/othervm specified]
11:46:43 Additional options from @modules: --add-modules jdk.internal.vm.compiler
11:46:43 elapsed time (seconds): 0.291
11:46:43 configuration:
11:46:43 Boot Layer
11:46:43 add modules: jdk.internal.vm.compiler
11:46:43
11:46:43 STDOUT:
11:46:43 STDERR:
11:46:43 java.lang.ExceptionInInitializerError
11:46:43 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
11:46:43 at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
11:46:43 at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
11:46:43 at java.base/java.lang.reflect.Method.invoke(Method.java:567)
11:46:43 at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
11:46:43 at java.base/java.lang.Thread.run(Thread.java:831)
11:46:43 Caused by: java.lang.RuntimeException: ERROR: Graal library directory is not specified, use -Dgraalunit.libs or TEST_IMAGE_GRAAL_DIR environment variable.
11:46:43 at compiler.graalunit.common.GraalUnitTestLauncher.(GraalUnitTestLauncher.java:61)
11:46:43 ... 6 more
11:46:43 STATUS:Failed.`main' threw exception: java.lang.ExceptionInInitializerError
11:46:43 rerun:
11:46:43 cd /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/scratch/0 && \
11:46:43 DISPLAY=:0 \
11:46:43 HOME=/home/jenkins \
11:46:43 PATH=/bin:/usr/bin:/usr/sbin \
11:46:43 CLASSPATH=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/jvmtest/openjdk/jtreg/lib/javatest.jar:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/jvmtest/openjdk/jtreg/lib/jtreg.jar \
11:46:43 /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image/bin/java \
11:46:43 -Dtest.vm.opts='-ea -esa -Xmx512m -XX:-UseCompressedOops' \
11:46:43 -Dtest.tool.vm.opts='-J-ea -J-esa -J-Xmx512m -J-XX:-UseCompressedOops' \
11:46:43 -Dtest.compiler.opts= \
11:46:43 -Dtest.java.opts= \
11:46:43 -Dtest.jdk=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image \
11:46:43 -Dcompile.jdk=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/j2sdk-image \
11:46:43 -Dtest.timeout.factor=8.0 \
11:46:43 -Dtest.nativepath=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/openjdk-test-image/hotspot/jtreg/native \
11:46:43 -Dtest.root=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg \
11:46:43 -Dtest.name=compiler/graalunit/ApiDirectivesTest.java \
11:46:43 -Dtest.file=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit/ApiDirectivesTest.java \
11:46:43 -Dtest.src=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit \
11:46:43 -Dtest.src.path=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg \
11:46:43 -Dtest.classes=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit/ApiDirectivesTest.d \
11:46:43 -Dtest.class.path=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit/ApiDirectivesTest.d:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0 \
11:46:43 -Dtest.class.path.prefix=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/test/lib:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0/compiler/graalunit:/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/classes/0 \
11:46:43 -Dtest.modules=jdk.internal.vm.compiler \
11:46:43 --add-modules jdk.internal.vm.compiler \
11:46:43 -ea \
11:46:43 -esa \
11:46:43 -Xmx512m \
11:46:43 -XX:-UseCompressedOops \
11:46:43 -Djava.library.path=/home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdkbinary/openjdk-test-image/hotspot/jtreg/native \
11:46:43 -XX:+UnlockExperimentalVMOptions \
11:46:43 -XX:+EnableJVMCI \
11:46:43 com.sun.javatest.regtest.agent.MainWrapper /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/TKG/output_16154626346082/jvm_compiler_1/work/compiler/graalunit/ApiDirectivesTest.d/main.0.jta -prefix org.graalvm.compiler.api.directives.test -exclude /home/jenkins/workspace/Test_openjdk16_hs_extended.openjdk_x86-64_linux/openjdk-tests/openjdk/openjdk-jdk/test/hotspot/jtreg/ProblemList-graal.txt
11:46:43
11:46:43 TEST RESULT: Failed. Execution failed: `main' threw exception: java.lang.ExceptionInInitializerError
```

Start with compiler/graalunit/common/GraalUnitTestLauncher.java at line 61 and inspect how it obtains the Graal library directory. Re-run compiler/graalunit/ApiDirectivesTest.java using the reported command and check the -Dgraalunit.libs or TEST_IMAGE_GRAAL_DIR inputs; done means the test no longer fails with the missing-directory error.

Written by the indexing model from the issue text.