Fix castexception for json audit report download by outputting stream…

… to array before writing

server/eclipse-project/src/main/java/us/freeandfair/corla/query/ExportQueries.java

@@ -128,24 +128,21 @@ public static void jsonOut(final String query, final OutputStream os) {
     // interleave an object separator (the comma and line break) into the stream
     // of json objects to create valid json thx!
     // https://stackoverflow.com/a/25624818
+    // call .skip() to remove the first separator
     final Stream<Object[]> results =
-        q.stream().flatMap(i -> Stream.of(new String[] {",\n"}, i)).skip(1); // remove
-                                                                             // the
-                                                                             // first
-                                                                             // separator
+            q.stream().flatMap(i -> Stream.of(",\n", i)).skip(1);
 
-    // write json by hand to preserve streaming writes in case of big data
     try {
       os.write("[".getBytes(StandardCharsets.UTF_8));
-      results.forEach(line -> {
+      Object[] resultsArr = results.toArray();
+
+      for(Object line : resultsArr) {
         try {
-          // the object array is the columns, but in this case there is only
-          // one, so we take it at index 0
-          os.write(line[0].toString().getBytes(StandardCharsets.UTF_8));
+          os.write(line.toString().getBytes(StandardCharsets.UTF_8));
         } catch (java.io.IOException e) {
           LOGGER.error(e.getMessage());
         }
-      });
+      }
 
       os.write("]".getBytes(StandardCharsets.UTF_8));
     } catch (java.io.IOException e) {