Spark Java App Debug

import java.util.Map;
import scala.Tuple2;
import java.util.Iterator;

  Map<String, String> env = System.getenv();
  for (String envName : env.keySet()) {
    System.out.format("ENV: %s=%s%n", envName, env.get(envName));
  }
  for (String s: args) {
    System.out.println("ARGS: " + s);
  }
  for (Tuple2<String, String> t: sparkConf.getAll()) {
    System.out.println("SPARKCONF: " + t._1 + "=" + t._2);
  }
  Iterator<Map.Entry<String, String>> it = spark.hadoopConfiguration().iterator();
  while (it.hasNext()) {
    System.out.println("HADOOPCONF: " + it.next());
  }