java.lang.OutOfMemoryError: Java heap space
   at nu.validator.htmlparser.sax.SAXTreeBuilder.appendCharacters(SAXTreeBuilder.java:65)
   at nu.validator.htmlparser.sax.SAXTreeBuilder.appendCharacters(SAXTreeBuilder.java:39)
   at nu.validator.htmlparser.impl.TreeBuilder.accumulateCharacters(TreeBuilder.java:5095)
   at nu.validator.htmlparser.impl.TreeBuilder.characters(TreeBuilder.java:866)
   at nu.validator.htmlparser.impl.ErrorReportingTokenizer.flushChars(ErrorReportingTokenizer.java:242)
   at nu.validator.htmlparser.impl.Tokenizer.stateLoop(Tokenizer.java:1447)
   at nu.validator.htmlparser.impl.Tokenizer.tokenizeBuffer(Tokenizer.java:1331)
   at nu.validator.htmlparser.io.Driver.runStates(Driver.java:316)
   at nu.validator.htmlparser.io.Driver.tokenize(Driver.java:216)
   at nu.validator.htmlparser.sax.HtmlParser.tokenize(HtmlParser.java:480)
   at nu.validator.htmlparser.sax.HtmlParser.parse(HtmlParser.java:423)
   at nu.validator.spec.html5.Html5SpecBuilder.parseSpec(Html5SpecBuilder.java:109)
   at nu.validator.spec.html5.Html5SpecBuilder.parseSpec(Html5SpecBuilder.java:127)
   at org.netbeans.modules.html.validation.ValidationTransaction.initialize(ValidationTransaction.java:351)
   at org.netbeans.modules.html.validation.ValidationTransaction.<init>(ValidationTransaction.java:418)
   at org.netbeans.modules.html.validation.ValidationTransaction.create(ValidationTransaction.java:169)
   at org.netbeans.modules.html.validation.ValidatorImpl.validate(ValidatorImpl.java:83)
   at org.netbeans.modules.html.editor.api.gsf.HtmlParserResult.getErrorsFromValidatorService(HtmlParserResult.java:294)
   at org.netbeans.modules.html.editor.api.gsf.HtmlParserResult.getValidationResults(HtmlParserResult.java:272)
   at org.netbeans.modules.html.editor.api.gsf.HtmlParserResult.getDiagnostics(HtmlParserResult.java:261)
   at org.netbeans.modules.html.editor.hints.HtmlRuleContext.<init>(HtmlRuleContext.java:84)
   at org.netbeans.modules.html.editor.hints.HtmlHintsProvider.computeErrors(HtmlHintsProvider.java:236)
   at org.netbeans.modules.html.editor.HtmlErrorFilter.filter(HtmlErrorFilter.java:104)
   at org.netbeans.modules.csl.core.ErrorFilterQuery.getFilteredErrors(ErrorFilterQuery.java:80)
   at org.netbeans.modules.csl.core.TLIndexerFactory$TLIndexer.index(TLIndexerFactory.java:284)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor$3.run(Indexable.java:248)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater.runIndexer(RepositoryUpdater.java:283)
   at org.netbeans.modules.parsing.spi.indexing.Indexable$MyAccessor.index(Indexable.java:246)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:3048)
   at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work$2.run(RepositoryUpdater.java:3070)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:593)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:155)