Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/5277#issuecomment-87969443
Before your change, the java interface of SparkContext$ contains:
```
public final class org.apache.spark.SparkContext$ extends java.lang.Object
implements org.apache.spark.Logging{
public java.lang.Object
org$apache$spark$SparkContext$$SPARK_CONTEXT_CONSTRUCTOR_LOCK();
}
```
But after your change, SPARK_CONTEXT_CONSTRUCTOR_LOCK isn't used out of
`SparkContext$`, so the compiler does not generate
```
public java.lang.Object
org$apache$spark$SparkContext$$SPARK_CONTEXT_CONSTRUCTOR_LOCK();
```
I think it's OK since this is not a Scala public API.
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