"WrappedArray$ofRef cannot be cast to String" Exception in Java Spark

Question

When writing in Spark Java I'm meeting this error while accessing a column of row of a Dataframe. I don't get why WrappedArray is retrieved from the Row instead of a normal Array.

java.lang.ClassCastException: class scala.collection.mutable.WrappedArray$ofRef cannot be cast to class [Ljava.lang.String

Example code : String[] myarray = my_df_row.getAs("col_name");

I need Java code, not scala or python. How to solve this issue ?

ZettaP · Accepted Answer · 2020-08-11 16:24:58Z

1

The WrappedArray needs to be converted to a Java list and then an Array. Code example :

import scala.collection.JavaConversions;

String[] myarray;
myarray = JavaConversions.seqAsJavaList(my_df_row.getAs("col_name")).toArray(myarray);

answered Aug 11, 2020 at 16:24

ZettaP

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