Latest Advancement:
I found the cause of NoClassDef exception: I wasn't using spark-submit,
instead I tried to run the spark application directly with SparkConf set in
the code. (this is handy in local debugging). However the old problem
remains: Even my maven-shade plugin doesn't give any warning of duplicate,
it still gives me the same error:
14/06/21 16:43:59 ERROR ExecutorUncaughtExceptionHandler: Uncaught exception
in thread Thread[Executor task launch worker-2,5,main]
java.lang.NoSuchFieldError: INSTANCE
at org.apache.http.entity.ContentType.parse(ContentType.java:229)
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