Github user koeninger commented on a diff in the pull request:
https://github.com/apache/spark/pull/15849#discussion_r87795091
--- Diff:
examples/src/main/java/org/apache/spark/examples/sql/streaming/JavaStructuredKafkaWordCount.java
---
@@ -0,0 +1,96 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.examples.sql.streaming;
+
+import org.apache.spark.api.java.function.FlatMapFunction;
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Encoders;
+import org.apache.spark.sql.Row;
+import org.apache.spark.sql.SparkSession;
+import org.apache.spark.sql.streaming.StreamingQuery;
+
+import java.util.Arrays;
+import java.util.Iterator;
+
+/**
+ * Consumes messages from one or more topics in Kafka and does wordcount.
+ * Usage: JavaStructuredKafkaWordCount <bootstrap-servers>
<subscribe-type> <topics>
+ * <bootstrap-servers> The Kafka "bootstrap.servers" configuration. A
+ * comma-separated list of host:port.
+ * <subscribe-type> There are three kinds of type, i.e. 'assign',
'subscribe',
+ * 'subscribePattern'.
+ * |- <assign> Specific TopicPartitions to consume. Json string
+ * | {"topicA":[0,1],"topicB":[2,4]}.
+ * |- <subscribe> The topic list to subscribe. A comma-separated list of
+ * | topics.
+ * |- <subscribePattern> The pattern used to subscribe to topic(s).
+ * | Only one of "assign, "subscribe" or "subscribePattern" options can
be
+ * | specified for Kafka source.
+ * <topics> A list of one or more kafka topics to consume from. Please
refer
--- End diff --
This isn't really a list of topics for assign or subscribePattern. I'd say
use a more general description, or stick to just subscribe
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