title: Checkstyle: CheckstyleException: Unable to find but file exists
body: <p>My Checkstyle configuration cannot seem to find my suppressions.xml, but it does exist and the filepath it is using works. Both my checkstyle.xml and suppressions.xml are in config/checkstyle. My checkstyle.xml has this:</p>
  
  <pre><code>&lt;module name="SuppressionFilter"&gt;
      &lt;property name="file" value="${config_loc}\suppressions.xml"/&gt;
      &lt;property name="optional" value="false"/&gt;
  &lt;/module&gt;
  </code></pre>
  
  <p>When I run <code>gradlew check --stacktrace</code>, the stack trace shows this:</p>
  
  <pre><code>Caused by: com.puppycrawl.tools.checkstyle.api.CheckstyleException: Unable to find: C:\Users\ntroncoso\Online Drive\projects\test-project\test-project-sdk\config\checkstyle\suppressions.xml
          at com.puppycrawl.tools.checkstyle.filters.SuppressionsLoader.getSuppressionLoader(SuppressionsLoader.java:287)
          at com.puppycrawl.tools.checkstyle.filters.SuppressionsLoader.loadSuppressions(SuppressionsLoader.java:238)
          at com.puppycrawl.tools.checkstyle.filters.SuppressionsLoader.loadSuppressions(SuppressionsLoader.java:224)
          at com.puppycrawl.tools.checkstyle.filters.SuppressionFilter.finishLocalSetup(SuppressionFilter.java:269)
          at com.puppycrawl.tools.checkstyle.api.AutomaticBean.configure(AutomaticBean.java:197)
          at com.puppycrawl.tools.checkstyle.Checker.setupChild(Checker.java:477)
          ... 206 more
  Caused by: java.io.FileNotFoundException: http://www.puppycrawl.com/dtds/configuration_1_3.dtd
          at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:647)
          at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(XMLEntityManager.java:1304)
          at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(XMLEntityManager.java:1270)
          at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(XMLDTDScannerImpl.java:264)
          at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1161)
          at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1045)
          at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:959)
          at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:602)
          at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:505)
          at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:842)
          at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
          at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
          at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
          at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:643)
          at com.puppycrawl.tools.checkstyle.XmlLoader.parseInputSource(XmlLoader.java:86)
          at com.puppycrawl.tools.checkstyle.filters.SuppressionsLoader.getSuppressionLoader(SuppressionsLoader.java:283)
  </code></pre>
  
  <p>As I mentioned, I can copy and paste that file path into file explorer and it'll open. I tried just hardcoding the full path as well, but I get the same error. The only thing I can think of is the \ntroncoso part. Some systems will treat that as a new line in the path. But typically, the error would also print the new line, so I don't feel like that's the issue.</p>