java.lang.OutOfMemoryError: GC overhead limit exceeded
   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:301)
   at org.netbeans.modules.html.editor.api.gsf.HtmlParserResult.getValidationResults(HtmlParserResult.java:278)
   at org.netbeans.modules.html.editor.api.gsf.HtmlParserResult.getDiagnostics(HtmlParserResult.java:267)
   at org.netbeans.modules.html.editor.hints.HtmlRuleContext.<init>(HtmlRuleContext.java:84)
   at org.netbeans.modules.html.editor.hints.HtmlHintsProvider.computeErrors(HtmlHintsProvider.java:255)
   at org.netbeans.modules.csl.hints.GsfHintsProvider.processProviderErrors(GsfHintsProvider.java:322)
   at org.netbeans.modules.csl.hints.GsfHintsProvider.processErrors(GsfHintsProvider.java:408)
   at org.netbeans.modules.csl.hints.GsfHintsProvider.processErrorsRecursive(GsfHintsProvider.java:384)
   at org.netbeans.modules.csl.hints.GsfHintsProvider.processErrorsRecursive(GsfHintsProvider.java:379)
   at org.netbeans.modules.csl.hints.GsfHintsProvider.refreshErrors(GsfHintsProvider.java:352)
   at org.netbeans.modules.csl.hints.GsfHintsProvider.access$200(GsfHintsProvider.java:104)
   at org.netbeans.modules.csl.hints.GsfHintsProvider$2.run(GsfHintsProvider.java:432)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)