Github user WeichenXu123 commented on the issue: https://github.com/apache/spark/pull/17819 @viirya Scala `with trait` is a complex mechanism and `trait` isn't equivalent to java's `interface`. Scala compiler will precompile and generate many other codes, so java-side code cannot directly call methods in `with trait`. In order to test this, you can modify this file and add a line: ``` --- a/examples/src/main/java/org/apache/spark/examples/ml/JavaBucketizerExample.java +++ b/examples/src/main/java/org/apache/spark/examples/ml/JavaBucketizerExample.java @@ -59,7 +59,8 @@ public class JavaBucketizerExample { Bucketizer bucketizer = new Bucketizer() .setInputCol("features") .setOutputCol("bucketedFeatures") - .setSplits(splits); + .setSplits(splits) + .setInputCols(new String[] {"features", "features2"}); // Transform original data into its bucket index. Dataset<Row> bucketedData = bucketizer.transform(dataFrame); ``` and you will find this Java class compile failed.
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