error: An internal exception has occurred.
   (java.lang.NullPointerException: Cannot invoke "com.sun.source.util.DocTreePath.getTreePath()" because "path" is null)
Please file a bug against the javadoc tool via the Java bug reporting page
(http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com)
for duplicates. Include error messages and the following diagnostic in your report. Thank you.
java.lang.NullPointerException: Cannot invoke "com.sun.source.util.DocTreePath.getTreePath()" because "path" is null
at jdk.javadoc/jdk.javadoc.internal.tool.Messager.getDiagnosticSource(Messager.java:574)
at jdk.javadoc/jdk.javadoc.internal.tool.Messager.print(Messager.java:223)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.Messages.report(Messages.java:159)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.Messages.warning(Messages.java:120)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter$2.visitErroneous(HtmlDocletWriter.java:1523)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter$2.visitErroneous(HtmlDocletWriter.java:1419)
at jdk.compiler/com.sun.tools.javac.tree.DCTree$DCErroneous.accept(DCTree.java:396)
at jdk.compiler/com.sun.source.util.SimpleDocTreeVisitor.visit(SimpleDocTreeVisitor.java:79)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.commentTagsToContent(HtmlDocletWriter.java:1641)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.TagletWriterImpl.paramTagOutput(TagletWriterImpl.java:300)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.taglets.ParamTaglet.processParamTag(ParamTaglet.java:302)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.taglets.ParamTaglet.getInheritedTagletOutput(ParamTaglet.java:211)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.taglets.ParamTaglet.getTagletOutput(ParamTaglet.java:179)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.taglets.ParamTaglet.getAllBlockTagOutput(ParamTaglet.java:142)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.taglets.TagletWriter.getBlockTagOutput(TagletWriter.java:288)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.getBlockTagOutput(HtmlDocletWriter.java:369)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.getBlockTagOutput(HtmlDocletWriter.java:355)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDocletWriter.addTagsInfo(HtmlDocletWriter.java:341)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.MethodWriterImpl.addTags(MethodWriterImpl.java:175)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.MethodBuilder.buildTagInfo(MethodBuilder.java:190)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.MethodBuilder.buildMethodDoc(MethodBuilder.java:128)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.MethodBuilder.build(MethodBuilder.java:106)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.ClassBuilder.buildMethodDetails(ClassBuilder.java:398)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.ClassBuilder.buildMemberDetails(ClassBuilder.java:346)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.ClassBuilder.buildClassDoc(ClassBuilder.java:149)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.builders.ClassBuilder.build(ClassBuilder.java:113)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDoclet.generateClassFiles(HtmlDoclet.java:324)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.generateClassFiles(AbstractDoclet.java:286)
at jdk.javadoc/jdk.javadoc.internal.doclets.formats.html.HtmlDoclet.generateClassFiles(HtmlDoclet.java:184)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:212)
at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.run(AbstractDoclet.java:115)
at jdk.javadoc/jdk.javadoc.doclet.StandardDoclet.run(StandardDoclet.java:103)
at jdk.javadoc/jdk.javadoc.internal.tool.Start.parseAndExecute(Start.java:556)
at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:393)
at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:342)
at jdk.javadoc/jdk.javadoc.internal.tool.Main.execute(Main.java:88)
at jdk.javadoc/jdk.javadoc.internal.tool.JavadocToolProvider.run(JavadocToolProvider.java:48)
at java.base/java.util.spi.ToolProvider.run(ToolProvider.java:138)
at oracle.micro.benchmarks.javac.hardcoded.JavadocJdk7Bench.execute(JavadocJdk7Bench.java:91)
at oracle.micro.benchmarks.javac.hardcoded.generated.JavadocJdk7Bench_execute_jmhTest.execute_ss_jmhStub(JavadocJdk7Bench_execute_jmhTest.java:404)
at oracle.micro.benchmarks.javac.hardcoded.generated.JavadocJdk7Bench_execute_jmhTest.execute_SingleShotTime(JavadocJdk7Bench_execute_jmhTest.java:360)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at org.openjdk.jmh.runner.BenchmarkHandler$BenchmarkTask.call(BenchmarkHandler.java:453)
at org.openjdk.jmh.runner.BenchmarkHandler$BenchmarkTask.call(BenchmarkHandler.java:437)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:831)