Exception in thread "main" java.io.IOException: Cannot load or parse '/rules/en/grammar.xml'
        at de.danielnaber.languagetool.rules.patterns.PatternRuleLoader.getRules(PatternRuleLoader.java:52)
        at de.danielnaber.languagetool.JLanguageTool.loadPatternRules(JLanguageTool.java:237)
        at de.danielnaber.languagetool.JLanguageTool.activateDefaultPatternRules(JLanguageTool.java:267)
        at de.danielnaber.languagetool.Main.<init>(Main.java)
        at de.danielnaber.languagetool.Main.main(Main.java:146)
        at <Module>.main(<Module>.java)
Caused by: org.xml.sax.SAXNotSupportedException: http://apache.org/xml/features/nonvalidating/load-external-dtd
        at gnu.xml.stream.SAXParser.setProperty(SAXParser.java:161)
        at gnu.xml.stream.SAXParser.setFeature(SAXParser.java)
        ... 6 more