Fixes #1473 Cannot create reports for non-Java projects

Author: adangel

ReleaseNotes.md

@@ -11,6 +11,7 @@ Eclipse Update Site: <https://sourceforge.net/projects/pmd/files/pmd-eclipse/upd
 *   squid:S1854 - Dead stores should be removed ([pull request #17](https://github.com/pmd/pmd-eclipse-plugin/pull/17))
 *   squid:S1213 - The members of an interface declaration or class should appear in a pre-defined order ([pull request #18](https://github.com/pmd/pmd-eclipse-plugin/pull/18))
 *   Fixed Executing Rule.start() ([bug #974](https://sourceforge.net/p/pmd/bugs/974/))
+*   Fixed Cannot create reports for non-Java projects ([bug #1473](https://sourceforge.net/p/pmd/bugs/1473/))
 *   Fixed Check Code doesn't work from project root in non-java projects ([bug #1474](https://sourceforge.net/p/pmd/bugs/1474/))
 *   Fixed Not Able to enable PMD for Apex in Eclipse ([bug #1483](https://sourceforge.net/p/pmd/bugs/1483/))
 

net.sourceforge.pmd.eclipse.plugin/src/main/java/net/sourceforge/pmd/eclipse/runtime/cmd/RenderReportsCmd.java

@@ -222,14 +222,15 @@ private Report createReport(IProject project) throws CoreException {
 
         IMarker[] markers = MarkerUtil.findAllMarkers(project);
         RuleSet ruleSet = PMDPlugin.getDefault().getPreferencesManager().getRuleSet();
+        boolean isJavaProject = project.hasNature(JavaCore.NATURE_ID);
 
         for (IMarker marker : markers) {
             String ruleName = marker.getAttribute(PMDRuntimeConstants.KEY_MARKERATT_RULENAME, "");
             Rule rule = ruleSet.getRuleByName(ruleName);
 
             FakeRuleViolation ruleViolation = createViolation(marker, rule);
 
-            if (marker.getResource() instanceof IFile) {
+            if (isJavaProject && marker.getResource() instanceof IFile) {
             	classAndPackageFrom(marker, ruleViolation);
             }