Update JavaCustomReceiver.java

数组下标越界

Author: xiao321 <1042460381@qq.com>

Closes #3153 from xiao321/patch-1 and squashes the following commits:

0ed17b5 [xiao321] Update JavaCustomReceiver.java

examples/src/main/java/org/apache/spark/examples/streaming/JavaCustomReceiver.java

@@ -70,7 +70,7 @@ public class JavaCustomReceiver extends Receiver<String> {
     // Create a input stream with the custom receiver on target ip:port and count the
     // words in input stream of \n delimited text (eg. generated by 'nc')
     JavaReceiverInputDStream<String> lines = ssc.receiverStream(
-      new JavaCustomReceiver(args[1], Integer.parseInt(args[2])));
+      new JavaCustomReceiver(args[0], Integer.parseInt(args[1])));
     JavaDStream<String> words = lines.flatMap(new FlatMapFunction<String, String>() {
       @Override
       public Iterable<String> call(String x) {