java.lang.OutOfMemoryError: Java heap space
   at nu.validator.htmlparser.sax.SAXTreeBuilder.createElement(SAXTreeBuilder.java:155)
   at nu.validator.htmlparser.sax.SAXTreeBuilder.createElement(SAXTreeBuilder.java:39)
   at nu.validator.htmlparser.impl.TreeBuilder.appendToCurrentNodeAndPushElementMayFoster(TreeBuilder.java:4899)
   at nu.validator.htmlparser.impl.TreeBuilder.startTag(TreeBuilder.java:1916)
   at nu.validator.htmlparser.impl.Tokenizer.emitCurrentTagToken(Tokenizer.java:1136)
   at nu.validator.htmlparser.impl.Tokenizer.stateLoop(Tokenizer.java:1630)
   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.api.gsf.HtmlParserResult.getDiagnostics(HtmlParserResult.java:255)
   at org.netbeans.modules.csl.editor.fold.GsfFoldManager.hasErrors(GsfFoldManager.java:714)
   at org.netbeans.modules.csl.editor.fold.GsfFoldManager.access$000(GsfFoldManager.java:129)
   at org.netbeans.modules.csl.editor.fold.GsfFoldManager$JavaElementFoldTask.run(GsfFoldManager.java:363)
   at org.netbeans.modules.csl.editor.fold.GsfFoldManager$JavaElementFoldTask.run(GsfFoldManager.java:268)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:573)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:744)
   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:1423)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)