Styjun

In java, I want to use the apache spark machine learning library and used sample code from https://spark.apache.org/docs/2.2.0/ml-pipeline.html to use a classifier to fit/ train data and predict on testing data.
But I cannot fit the classifier without a class def not found error.

SparkSession spk = SparkSession.builder().appName("dectreetennis").getOrCreate();

List<Row> dataTraining = Arrays.asList(
 RowFactory.create(1.0, Vectors.dense(0.0, 1.1, 0.1)),
 RowFactory.create(0.0, Vectors.dense(2.0, 1.0, -1.0)),
 RowFactory.create(0.0, Vectors.dense(2.0, 1.3, 1.0)),
 RowFactory.create(1.0, Vectors.dense(0.0, 1.2, -0.5))
);

StructType schema = new StructType(new StructField[]
 new StructField("activity", DataTypes.DoubleType, false, Metadata.empty()),
 new StructField("features", new VectorUDT(), false, Metadata.empty())
 );

Dataset<Row> training1 = spk.createDataFrame(dataTraining, schema);

LogisticRegression lr = new LogisticRegression();

System.out.println("LogisticRegression parameters:n" + lr.explainParams() + "n");

lr.setMaxIter(10).setRegParam(0.01);

LogisticRegressionModel model1 = lr.fit(training1);

Here is the contents of the pom file:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>javaspark</groupId>
 <artifactId>javaspark</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <dependencies>
 <dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
 <groupId>org.apache.spark</groupId>
 <artifactId>spark-sql_2.11</artifactId>
 <version>2.0.2</version>
 <scope>compile</scope>
 </dependency>
 <dependency>
 <groupId>org.apache.spark</groupId>
 <artifactId>spark-mllib_2.11</artifactId>
 <version>2.0.2</version>
 </dependency>
 <dependency>
 <groupId>com.github.fommil.netlib</groupId>
 <artifactId>all</artifactId>
 <version>1.1.2</version>
 <type>pom</type>
</dependency>
 </dependencies>
 <build>
 <sourceDirectory>src</sourceDirectory>
 <plugins>
 <plugin>
 <artifactId>maven-compiler-plugin</artifactId>
 <version>3.8.0</version>
 <configuration>
 <source>1.8</source>
 <target>1.8</target>
 </configuration>
 </plugin>
 </plugins>
 </build>
</project>

I get the following:

Exception in thread "main" java.lang.NoClassDefFoundError: org/netlib/blas/Dscal

at com.github.fommil.netlib.F2jBLAS.dscal(F2jBLAS.java:176)
at org.apache.spark.ml.linalg.BLAS$.scal(BLAS.scala:223)
at org.apache.spark.ml.classification.LogisticAggregator.gradient(LogisticRegression.scala:1069)