java.lang.ClassNotFoundException: com.sun.tools.doclint.HtmlTag starting from ModuleCL@3fd4b761[org.netbeans.modules.javadoc] with possible defining loaders [ModuleCL@29cb7a2d[org.netbeans.libs.javacimpl]] and declared parents [org.netbeans.MainImpl$BootClassLoader@31221be2, ModuleCL@123429b5[org.netbeans.modules.lexer], ModuleCL@74c757d4[org.openide.windows], ModuleCL@695baae2[org.netbeans.modules.editor.lib2], ModuleCL@6e46e69c[org.netbeans.modules.java.source.base], ModuleCL@f3dacc5[org.netbeans.libs.javacapi], ModuleCL@24343d0f[org.openide.dialogs], ModuleCL@2099bf45[org.openide.explorer], ModuleCL@655f598b[org.netbeans.api.java.classpath], ModuleCL@c6d2aca[org.netbeans.modules.editor.guards], ...16 more]
   at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:228)
   at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: com/sun/tools/doclint/HtmlTag
   at org.netbeans.modules.javadoc.hints.Analyzer.visitStartElement(Analyzer.java:660)
   at org.netbeans.modules.javadoc.hints.Analyzer.visitStartElement(Analyzer.java:137)
   at com.sun.tools.javac.tree.DCTree$DCStartElement.accept(DCTree.java:727)
   at com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:71)
   at org.netbeans.modules.javadoc.hints.Analyzer.scan(Analyzer.java:773)
   at org.netbeans.modules.javadoc.hints.Analyzer.scan(Analyzer.java:137)
   at com.sun.source.util.DocTreeScanner.scanAndReduce(DocTreeScanner.java:84)
   at com.sun.source.util.DocTreeScanner.scan(DocTreeScanner.java:99)
   at com.sun.source.util.DocTreeScanner.visitDocComment(DocTreeScanner.java:184)
   at org.netbeans.modules.javadoc.hints.Analyzer.visitDocComment(Analyzer.java:291)
   at org.netbeans.modules.javadoc.hints.Analyzer.visitDocComment(Analyzer.java:137)
   at com.sun.tools.javac.tree.DCTree$DCDocComment.accept(DCTree.java:135)
   at com.sun.source.util.DocTreePathScanner.scan(DocTreePathScanner.java:50)
   at org.netbeans.modules.javadoc.hints.Analyzer.analyze(Analyzer.java:191)
   at org.netbeans.modules.javadoc.hints.JavadocHint.errorHint(JavadocHint.java:217)
   at sun.reflect.GeneratedMethodAccessor259.invoke(GeneratedMethodAccessor259.java:0)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
   at java.lang.reflect.Method.invoke(Method.java:498)
   at org.netbeans.modules.java.hints.providers.code.CodeHintProviderImpl$WorkerImpl.createErrors(CodeHintProviderImpl.java:340)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.runHint(HintsInvoker.java:821)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.access$400(HintsInvoker.java:113)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.runAndAdd(HintsInvoker.java:680)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:699)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:633)
   at com.sun.source.util.TreeScanner.scan(TreeScanner.java:106)
   at org.netbeans.api.java.source.support.CancellableTreePathScanner.scan(CancellableTreePathScanner.java:103)
   at com.sun.source.util.TreeScanner.scanAndReduce(TreeScanner.java:114)
   at com.sun.source.util.TreeScanner.visitCompilationUnit(TreeScanner.java:145)
   at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:563)
   at com.sun.source.util.TreePathScanner.scan(TreePathScanner.java:53)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker$ScannerImpl.scan(HintsInvoker.java:724)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHintsImpl(HintsInvoker.java:268)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:251)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:216)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:189)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsInvoker.computeHints(HintsInvoker.java:151)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:137)
   at org.netbeans.modules.java.hints.spiimpl.hints.HintsTask.run(HintsTask.java:88)
   at org.netbeans.modules.java.source.JavaSourceAccessor$CancelableTaskWrapper.run(JavaSourceAccessor.java:298)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:584)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:809)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)