jdk/javadoc/doclet/testGeneratedClasses/TestGeneratedClasses.java fails after JDK-8261976

The following test fails in the JDK17 CI:

jdk/javadoc/doclet/testGeneratedClasses/TestGeneratedClasses.java

Here's a snippet from the log file:

----------System.err:(14/852)----------
java.lang.Error: 1 of 4 subtests failed
at javadoc.tester.JavadocTester.printSummary(JavadocTester.java:962)
at javadoc.tester.JavadocTester.runTests(JavadocTester.java:286)
at TestGeneratedClasses.main(TestGeneratedClasses.java:43)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:831)

JavaTest Message: Test threw exception: java.lang.Error
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.Error: 1 of 4 subtests failed