Hadoop-异常-Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/avro/io/DatumReader

 //maven

org.apache.avr

 下载不完全 ,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

解决方法:
1.删除avro 的jar包物理磁盘文件,
2.右键工程--->maven-->updateProject
重新下载对应的jar包