一、问题描述

使用sparkml库的linalg类库等，尽管引入spark mllib依赖，但是发现无法导入相应库，运行后报错：

Error:(2, 25) object ml is not a member of package org.apache.spark
import org.apache.spark.ml.classification.LogisticRegression
Error:(4, 25) object ml is not a member of package org.apache.spark
import org.apache.spark.ml.feature.VectorAssembler
Error:(5, 25) object ml is not a member of package org.apache.spark
import org.apache.spark.ml.linalg
Error:(6, 25) object ml is not a member of package org.apache.spark
import org.apache.spark.ml.regression.LinearRegression
Error:(46, 13) not found: value model
    val s = model.summary.totalIterations

二、问题原因

排除了很多原因：

（1）已经导入spark的maven依赖

    <dependency>
      <groupId>org.apache.spark</groupId>
      <artifactId>spark-mllib_2.11</artifactId>
      <version>2.1.0</version>
<!--      <scope>runtime</scope>-->
    </dependency>

（2）查看maven依赖，确实有这个jar包，以及对应类库

（3）最后发现竟然因为是没有导入源码，而导致无法引入，坑啊！

三、解决问题

1.右键maven的pom依赖

2.导入源码如下图

3.然后就可以导入相应类库了

import org.apache.spark.ml.classification.LogisticRegression
import org.apache.spark.ml.feature.VectorAssembler
import org.apache.spark.ml.linalg
import org.apache.spark.ml.regression.LinearRegression