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我得到了这个异常：在运行 Java 程序时

 ByteBuffer uuid = ByteBuffer.wrap(decompose(entry.key));
 //           usersWriter.newRow(uuid);

如果我评论:usersWriter.newRow(uuid);

Exception in thread "main" java.lang.NullPointerException
        at org.apache.cassandra.io.sstable.AbstractSSTableSimpleWriter.addColumn(AbstractSSTableSimpleWriter.java:114)
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