Using this doclet under Java 17 results in an abstract method error

[dakusui]

Using this doclet under Java 17 results in an abstract method error.
For Java 11 it works fine.
Please let me know any other information necessary for fixing this.

[ERROR] Standard Doclet version 17.0.4+11-LTS-179
[ERROR] Building tree for all the packages and classes...
[ERROR] error: An internal exception has occurred. 
[ERROR]         (java.lang.AbstractMethodError: Receiver class org.asciidoctor.asciidoclet.AsciiDocTrees does not define or inherit an implementation of the resolved method 'abstract java.lang.String getCharacters(com.sun.source.doctree.EntityTree)' of abstract class com.sun.source.util.DocTrees.)
[ERROR] Please file a bug against the javadoc tool via the Java bug reporting page
[ERROR] (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com)
[ERROR] for duplicates. Include error messages and the following diagnostic in your report. Thank you.
[ERROR] java.lang.AbstractMethodError: Receiver class org.asciidoctor.asciidoclet.AsciiDocTrees does not define or inherit an implementation of the resolved method 'abstract java.lang.String getCharacters(com.sun.source.doctree.EntityTree)' of abstract class com.sun.source.util.DocTrees.
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclint.Checker.visitEntity(Checker.java:313)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclint.Checker.visitEntity(Checker.java:106)
[ERROR]         at jdk.compiler/com.sun.tools.javac.tree.DCTree$DCEntity.accept(DCTree.java:366)
[ERROR]         at jdk.compiler/com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:76)
[ERROR]         at jdk.compiler/com.sun.source.util.DocTreeScanner.scanAndReduce(DocTreeScanner.java:88)
[ERROR]         at jdk.compiler/com.sun.source.util.DocTreeScanner.scan(DocTreeScanner.java:103)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclint.Checker.visitDocComment(Checker.java:273)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclint.Checker.visitDocComment(Checker.java:106)
[ERROR]         at jdk.compiler/com.sun.tools.javac.tree.DCTree$DCDocComment.accept(DCTree.java:138)
[ERROR]         at jdk.compiler/com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:55)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclint.Checker.scan(Checker.java:234)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclint.DocLint.scan(DocLint.java:348)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.BaseConfiguration.runDocLint(BaseConfiguration.java:713)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getDocCommentTree0(Utils.java:2679)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getDocCommentTree(Utils.java:2749)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils$CommentHelperCache.computeIfAbsent(Utils.java:2892)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getCommentHelper(Utils.java:2524)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.hasBlockTag(Utils.java:2584)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.hasBlockTag(Utils.java:2579)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.hasHiddenTag(Utils.java:1499)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.ClassTree.buildTree(ClassTree.java:175)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.ClassTree.<init>(ClassTree.java:119)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:210)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.run(AbstractDoclet.java:115)
[ERROR]         at jdk.javadoc/jdk.javadoc.doclet.StandardDoclet.run(StandardDoclet.java:103)
[ERROR]         at org.asciidoctor.asciidoclet.Asciidoclet.run(Asciidoclet.java:226)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.tool.Start.parseAndExecute(Start.java:556)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:393)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:342)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.tool.Main.execute(Main.java:63)
[ERROR]         at jdk.javadoc/jdk.javadoc.internal.tool.Main.main(Main.java:52)

Thanks in advance.