Github user hvanhovell commented on a diff in the pull request:

    https://github.com/apache/spark/pull/8209#discussion_r37103311
  
    --- Diff: 
launcher/src/main/java/org/apache/spark/launcher/SparkLauncher.java ---
    @@ -211,10 +211,10 @@ public SparkLauncher addSparkArg(String arg) {
        * Adds an argument with a value to the Spark invocation. If the 
argument name corresponds to
        * a known argument, the code validates that the argument actually 
expects a value, and throws
        * an exception otherwise.
    -   * <p/>
    +   * <p>
    --- End diff --
    
    So it turns out that javadoc in java 8 doesn't allow self-closing elements 
(```<br/>``` and ```<p/>```) any more:
    
http://stackoverflow.com/questions/26049329/javadoc-in-jdk-8-invalid-self-closing-element-not-allowed
    
http://www.oracle.com/technetwork/java/javase/documentation/index-137868.html#format
    
    ```<p>``` is the preferred seperator for a paragraph. So its is not HTML 
but Javadoc we are talking about. Sorry about the confusion.


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