XSD validator aggressively logs validation errors stacktraces

[fbricon]

When you create a new xsd file and open it, the server logs an exception:

[Error - 11:42:22 AM] Jun. 05, 2019 11:42:22 org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.XSDValidator doDiagnostics()
Message: Unexpected XMLValidator error
::::-1:-1:-1:Premature end of file.
	at org.eclipse.lsp4xml.services.extensions.diagnostics.AbstractLSPErrorReporter.reportError(AbstractLSPErrorReporter.java:94)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLVersionDetector.determineDocVersion(Unknown Source)
	at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.parse(Unknown Source)
	at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.parse(Unknown Source)
	at org.apache.xerces.impl.xs.opti.SchemaDOMParser.parse(Unknown Source)
	at org.apache.xerces.impl.xs.traversers.XSDHandler.getSchemaDocument(Unknown Source)
	at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
	at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(Unknown Source)
	at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
	at org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.LSPXMLGrammarPreparser.preparseGrammar(LSPXMLGrammarPreparser.java:53)
	at org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.XSDValidator.doDiagnostics(XSDValidator.java:89)
	at org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.XSDDiagnosticsParticipant.doDiagnostics(XSDDiagnosticsParticipant.java:38)
	at org.eclipse.lsp4xml.services.XMLDiagnostics.doExtensionsDiagnostics(XMLDiagnostics.java:83)
	at org.eclipse.lsp4xml.services.XMLDiagnostics.doDiagnostics(XMLDiagnostics.java:51)
	at org.eclipse.lsp4xml.services.XMLLanguageService.doDiagnostics(XMLLanguageService.java:111)
	at org.eclipse.lsp4xml.services.XMLLanguageService.publishDiagnostics(XMLLanguageService.java:120)
	at org.eclipse.lsp4xml.XMLTextDocumentService.doTriggerValidation(XMLTextDocumentService.java:427)
	at org.eclipse.lsp4xml.XMLTextDocumentService.lambda$triggerValidation$19(XMLTextDocumentService.java:419)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:835)

[Trace - 11:42:22 AM] Received notification 'textDocument/publishDiagnostics'.

If you add some invalid content:

<?xml version="1.0" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:complexType name="property">
</xs:schema>

Then:

Message: Unexpected XMLValidator error
:file:///Users/fbricon/Downloads/sample-resources/incomplete.xsd:file:///Users/fbricon/Downloads/sample-resources/incomplete.xsd:file:///Users/fbricon/Downloads/sample-resources/incomplete.xsd:4:3:116:The element type "xs:complexType" must be terminated by the matching end-tag "</xs:complexType>".
	at org.eclipse.lsp4xml.services.extensions.diagnostics.AbstractLSPErrorReporter.reportError(AbstractLSPErrorReporter.java:94)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)
	at org.apache.xerces.impl.XMLScanner.reportFatalError(Unknown Source)
	at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.parse(Unknown Source)
	at org.apache.xerces.impl.xs.opti.SchemaParsingConfig.parse(Unknown Source)
	at org.apache.xerces.impl.xs.opti.SchemaDOMParser.parse(Unknown Source)
	at org.apache.xerces.impl.xs.traversers.XSDHandler.getSchemaDocument(Unknown Source)
	at org.apache.xerces.impl.xs.traversers.XSDHandler.parseSchema(Unknown Source)
	at org.apache.xerces.impl.xs.XMLSchemaLoader.loadSchema(Unknown Source)
	at org.apache.xerces.impl.xs.XMLSchemaLoader.loadGrammar(Unknown Source)
	at org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.LSPXMLGrammarPreparser.preparseGrammar(LSPXMLGrammarPreparser.java:53)
	at org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.XSDValidator.doDiagnostics(XSDValidator.java:89)
	at org.eclipse.lsp4xml.extensions.xsd.participants.diagnostics.XSDDiagnosticsParticipant.doDiagnostics(XSDDiagnosticsParticipant.java:38)
	at org.eclipse.lsp4xml.services.XMLDiagnostics.doExtensionsDiagnostics(XMLDiagnostics.java:83)
	at org.eclipse.lsp4xml.services.XMLDiagnostics.doDiagnostics(XMLDiagnostics.java:51)
	at org.eclipse.lsp4xml.services.XMLLanguageService.doDiagnostics(XMLLanguageService.java:111)
	at org.eclipse.lsp4xml.services.XMLLanguageService.publishDiagnostics(XMLLanguageService.java:120)
	at org.eclipse.lsp4xml.XMLTextDocumentService.doTriggerValidation(XMLTextDocumentService.java:427)
	at org.eclipse.lsp4xml.XMLTextDocumentService.lambda$triggerValidation$19(XMLTextDocumentService.java:419)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:835)

Those errors should not pollute the logs.