RFR: 8276665: ObjectInputStream.GetField.get(name, object) should throw ClassNotFoundException

[Roger Riggs]

The ObjectInputStream.GetField.get(String name, Object val) method is returning null instead of throwing an exception when the class of the object is not found. The caller is not able to correctly handle the case where the class is not found. The signature of GetField.get(name, val) should have a throws ClassNotFoundException and a ClassNotFoundException exception should be thrown.

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Commit messages:
 - 8276665: ObjectInputStream.GetField.get should throw ClassNotFoundException

Changes: https://git.openjdk.java.net/jdk/pull/6393/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6393&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276665
  Stats: 211 lines in 2 files changed: 207 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6393.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6393/head:pull/6393

PR: https://git.openjdk.java.net/jdk/pull/6393