Java 复杂类型的reducer中ReadFields（）中的空缓冲区

我试图在映射器和reducer之间传递一个复杂的可写性，更具体地说是ObjectWritables的ArrayWritable

public class ObjectArrayWritable extends ArrayWritable {
    public ObjectArrayWritable() {
        super(ObjectWritable.class);
    }
}

我的映射器：

mapper

我的减速机：

reducer

reducer在可写接口的

readfields（）

方法上崩溃，并引发以下异常：

java.lang.NullPointerException
    at org.apache.hadoop.io.ObjectWritable.readObject(ObjectWritable.java:183)
    at org.apache.hadoop.io.ObjectWritable.readFields(ObjectWritable.java:66)
    at org.apache.hadoop.io.ArrayWritable.readFields(ArrayWritable.java:90)
    at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:67)
    at org.apache.hadoop.io.serializer.WritableSerialization$WritableDeserializer.deserialize(WritableSerialization.java:40)
    at org.apache.hadoop.mapreduce.ReduceContext.nextKeyValue(ReduceContext.java:116)
    at org.apache.hadoop.mapreduce.ReduceContext.nextKey(ReduceContext.java:92)
    at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:175)
    at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:566)
    at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408)
    at org.apache.hadoop.mapred.LocalJobRunner$Job.run(LocalJobRunner.java:216)

当我尝试实现自己的自定义可写并调试它时，我注意到

读取字段（DataInput data）

中的DataInput缓冲区接收到空值

请注意，我的错误类似于： 但是清理这个物体没有帮助

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有人能帮忙吗？

我不认为您正在处理ObjectArrayWritable中没有任何内容的情况。我不能确定，因为没有提供代码