Several jdk/javadoc tests fail with an error like this:

...
Generating out-1/deprecated-list.html...
Building index for all classes...
Generating out-1/allclasses-frame.html...
Generating out-1/allclasses-frame.html...
Generating out-1/index.html...
Generating out-1/overview-summary.html...
Generating out-1/index-all.html...
Building index for all classes...
Generating out-1/allclasses-index.html...
Generating out-1/allpackages-index.html...
Generating out-1/help-doc.html...
20 warnings

Starting subtest 1.1: Check links
  Checked 52 files.
  Found 1766 references to 283 anchors in 54 files and 0 other URIs.
       0 missing files
       0 duplicate ids
       0 missing ids
Passed: Links are OK

Starting subtest 1.2: Check accessibility
out-1/overview-frame.html:33: missing headings: h1
1 bad headings
All regions OK
FAILED: 1 errors found when checking accessibility
        at javadoc.tester.JavadocTester.checkAccessibility(JavadocTester.java:544)
        at javadoc.tester.JavadocTester.javadoc(JavadocTester.java:388)
        at TestUseOption.test1(TestUseOption.java:47)