[SPARK-24386][SPARK-24768][BUILD][FOLLOWUP] Fix lint-java and Scala 2.12 build.

[ueshin]

What changes were proposed in this pull request?

This pr fixes lint-java and Scala 2.12 build.

lint-java:

[ERROR] src/test/resources/log4j.properties:[0] (misc) NewlineAtEndOfFile: File does not end with a newline.

Scala 2.12 build:

[error] /.../sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/continuous/ContinuousCoalesceRDD.scala:121: overloaded method value addTaskCompletionListener with alternatives:
[error]   (f: org.apache.spark.TaskContext => Unit)org.apache.spark.TaskContext <and>
[error]   (listener: org.apache.spark.util.TaskCompletionListener)org.apache.spark.TaskContext
[error]  cannot be applied to (org.apache.spark.TaskContext => java.util.List[Runnable])
[error]       context.addTaskCompletionListener { ctx =>
[error]               ^

How was this patch tested?

Manually executed lint-java and Scala 2.12 build in my local environment.

[HyukjinKwon]

hm.... I didn't know Maven's checkstyle checks resources too.

[ueshin]

Me neither, actually.

[HyukjinKwon]

LGTM

[SparkQA]

Test build #93214 has finished for PR 21801 at commit 7f78d75.

• This patch fails Spark unit tests.
• This patch merges cleanly.
• This patch adds no public classes.

[ueshin]

Jenkins, retest this please.

[SparkQA]

Test build #93216 has finished for PR 21801 at commit 7f78d75.

• This patch fails due to an unknown error code, -9.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

retest this please

[SparkQA]

Test build #93218 has finished for PR 21801 at commit 7f78d75.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[HyukjinKwon]

Merged to master.