MapReduce 生成Hfile 的Mrunit单元测试提示Serialization空指针

    
    
java.lang.NullPointerException
at org.apache.hadoop.mrunit.Serialization.copy(Serialization.java:61)
at org.apache.hadoop.mrunit.Serialization.copy(Serialization.java:81)

    
    
 try {
      serializer = (Serializer<Object>) serializationFactory //这里为空
 .getSerializer(clazz);
      deserializer = (Deserializer<Object>) serializationFactory
          .getDeserializer(clazz);
    } catch (NullPointerException e) {
      throw new IllegalStateException(
          "No applicable class implementing Serialization in conf at io.serializations for "
              + orig.getClass(), e);
    }
    try {
      final DataOutputBuffer outputBuffer = new DataOutputBuffer();
      serializer.open(outputBuffer);
      serializer.serialize(orig);
      final DataInputBuffer inputBuffer = new DataInputBuffer();
      inputBuffer.reset(outputBuffer.getData(), outputBuffer.getLength());
      deserializer.open(inputBuffer);
      return (T) deserializer.deserialize(copy);
    } catch (final IOException e) {
      throw new RuntimeException(e);
    }

    
    
Configuration conf = mapDriver.getConfiguration();
conf.setStrings("io.serializations", conf.get("io.serializations"),
				MutationSerialization.class.getName(),
				ResultSerialization.class.getName(),
				KeyValueSerialization.class.getName());