Fix report directory creation and remove JDoc for non-existent parameters.

jplag/src/main/java/de/jplag/reporting/JsonReport.java

@@ -26,7 +26,7 @@ public class JsonReport implements Report {
         JPlagReport report = ReportObjectFactory.getReportObject(result);
         File directory = new File(path);
         if (!directory.exists()) {
-            if (!directory.mkdir()) {
+            if (!directory.mkdirs()) {
                 logger.error("Failed to create dir.");
             }
         }

jplag/src/main/java/de/jplag/reporting/reportobject/ReportObjectFactory.java

@@ -34,7 +34,6 @@ public class ReportObjectFactory {
 
     /**
      * Generates an Overview DTO of a JPlagResult.
-     * @param numberOfExportedComparisons
      */
     private static OverviewReport generateOverviewReport(JPlagResult result) {
         int numberOfComparisons = result.getOptions().getMaximumNumberOfComparisons();
@@ -67,7 +66,6 @@ public class ReportObjectFactory {
 
     /**
      * Generates detailed ComparisonReport DTO for each comparison in a JPlagResult.
-     * @param numberOfExportedComparisons
      * @return A list with ComparisonReport DTOs.
      */
     private static List<ComparisonReport> generateComparisonReports(JPlagResult result) {