The newly added test serviceability/attach/AttachAPIv2/StreamingOutputTest.java intermittent fails java.lang.NoClassDefFoundError: jdk/test/lib/Utils.

The test log snippet:
STDOUT:
Testing: clientStreaming=true, vmStreaming=false
STDERR:
java.lang.NoClassDefFoundError: jdk/test/lib/Utils
at jdk.test.lib.apps.LingeredApp.startApp(LingeredApp.java:495)
at jdk.test.lib.apps.LingeredApp.startApp(LingeredApp.java:507)
at StreamingOutputTest.test(StreamingOutputTest.java:56)
at StreamingOutputTest.main(StreamingOutputTest.java:48)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1447)
Caused by: java.lang.ClassNotFoundException: jdk.test.lib.Utils
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:490)
... 8 more