tools/jpackage/junit/junit.java failed due to "module not found: jdk.incubator.jpackage"

The following test fails in the JDK14 CI:

tools/jpackage/junit/junit.java

Here's a snippet from the log file:

#section:shell
----------messages:(3/113)----------
command: shell run_junit.sh
reason: User specified action: run shell run_junit.sh
elapsed time (seconds): 7.802
----------System.out:(0/0)----------
----------System.err:(58/7866)----------
+ set -e
+ [ -z '' ]
+ /bin/bash /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/run_junit.sh
+ set -e
+ '[' -z /bin/bash ']'
+ sources=()
+ classes=()
++ grep -v junit.java
++ find /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit -name '*.java'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/DottedVersionTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/OverridableResourceTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/PathGroupTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/ApplicationLayoutTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/DeployParamsTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/InvalidDottedVersionTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/AppImageFileTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/CompareDottedVersionTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ for s in $(find "${TESTSRC}" -name "*.java" | grep -v junit.java)
+ sources+=("$s")
+ classes+=($(echo "$s" | sed -e "s|${TESTSRC}/||" -e 's|/|.|g' -e 's/.java$//'))
++ echo /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/ToolValidatorTest.java
++ sed -e 's|/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/||' -e 's|/|.|g' -e 's/.java$//'
+ common_args=(--add-modules jdk.incubator.jpackage --patch-module jdk.incubator.jpackage="${TESTSRC}${PS}${TESTCLASSES}" --add-reads jdk.incubator.jpackage=ALL-UNNAMED --add-exports jdk.incubator.jpackage/jdk.incubator.jpackage.internal=ALL-UNNAMED -classpath "${TESTCLASSPATH}")
+ /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/solaris-sparcv9.jdk/jdk-14/bin/javac -J-Xmx512m -J-XX:MaxRAMPercentage=2 -J-ea -J-esa --add-modules jdk.incubator.jpackage --patch-module jdk.incubator.jpackage=/scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit:/scratch/opt/mach5/mesos/work_dir/47707759-80b9-4734-85d0-f9d401f920f8/testoutput/test-support/jtreg_open_test_jdk_tier2/classes/9/tools/jpackage/junit/junit.d --add-reads jdk.incubator.jpackage=ALL-UNNAMED --add-exports jdk.incubator.jpackage/jdk.incubator.jpackage.internal=ALL-UNNAMED -classpath /scratch/opt/mach5/mesos/work_dir/47707759-80b9-4734-85d0-f9d401f920f8/testoutput/test-support/jtreg_open_test_jdk_tier2/classes/9/tools/jpackage/junit/junit.d:/scratch/opt/mach5/mesos/work_dir/jib-master/install/java/re/jtreg/4.2/promoted/all/b14/bundles/jtreg_bin-4.2.zip/jtreg/lib/junit.jar -d /scratch/opt/mach5/mesos/work_dir/47707759-80b9-4734-85d0-f9d401f920f8/testoutput/test-support/jtreg_open_test_jdk_tier2/classes/9/tools/jpackage/junit/junit.d /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/DottedVersionTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/OverridableResourceTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/PathGroupTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/ApplicationLayoutTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/DeployParamsTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/InvalidDottedVersionTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/AppImageFileTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/CompareDottedVersionTest.java /scratch/opt/mach5/mesos/work_dir/jib-master/install/jdk-14+27-1254/src.full/open/test/jdk/tools/jpackage/junit/jdk/incubator/jpackage/internal/ToolValidatorTest.java
error: module not found: jdk.incubator.jpackage
1 error
----------rerun:(33/2634)*----------

This error message:

> error: module not found: jdk.incubator.jpackage

makes me wonder why that module is missing.
Do we have a build race?