//maven

org.apache.avr

 下載不完全 ,去maven 

If you are using maven to build your jar, you need to add the following dependency:

    <dependency>
        <groupId>org.apache.avro</groupId>
        <artifactId>avro</artifactId>
    </dependency>


注意,eclipse 提示maven工程缺少jar 包 Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/avro/io/DatumReader

解決方法:
1.刪除avro 的jar包物理磁碟檔案,
2.右鍵工程--->maven-->updateProject
重新下載對應的jar包