CODEWITHSUNDEEP
pythonscalaapache-sparkpyspark
Johnas
Johnas

Reputation: 336

java.lang.ClassNotFoundException: scala.Product$class

I am trying to connect to an elasticsearch database using spark and my code snippet looks like this:

spark = SparkSession.builder.master("local").appName("Spark").getOrCreate()
reader = spark.read.format("org.elasticsearch.spark.sql").option("es.read.metadata", "true").option("es.nodes.wan.only","true").option("es.port","9200").option("es.net.ssl","false").option("es.nodes", "here-ip-adress")
df = reader.load("my_index")

When calling df = reader.load("my_index") I get the following error:

py4j.protocol.Py4JJavaError: An error occurred while calling o45.load.: java.lang.NoClassDefFoundError: scala/Product$class
    at org.elasticsearch.spark.sql.ElasticsearchRelation.<init>(DefaultSource.scala:191)
    at org.elasticsearch.spark.sql.DefaultSource.createRelation(DefaultSource.scala:93)
    at org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:350)
    at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:274)
    at org.apache.spark.sql.DataFrameReader.$anonfun$load$3(DataFrameReader.scala:245)
    at scala.Option.getOrElse(Option.scala:189)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:245)
    at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:188)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at py4j.reflection.MethodInvoker.invoke(MethodInvoker.java:244)
    at py4j.reflection.ReflectionEngine.invoke(ReflectionEngine.java:357)
    at py4j.Gateway.invoke(Gateway.java:282)
    at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
    at py4j.commands.CallCommand.execute(CallCommand.java:79)
    at py4j.ClientServerConnection.waitForCommands(ClientServerConnection.java:182)
    at py4j.ClientServerConnection.run(ClientServerConnection.java:106)
    at java.lang.Thread.run(Thread.java:748)

Caused by: java.lang.ClassNotFoundException: scala.Product$class
        at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
        ... 20 more

There are some other solutions here on stackoverflow, but for some reason none of them have helped. I am using Spark version 3.2.0, Scala version 2.12.15 (OpenJDK 64-Bit Server VM, Java 1.8.0_312) and running the code with spark-submit --packages org.elasticsearch:elasticsearch-hadoop:6.1.0

Thanks in advance!

Upvotes: 1

Views: 6014

Answers (2)

F Baig
F Baig

Reputation: 357

For anyone coming here in 2023,

I had same error with ElasticSearch version 8.6.1, PySpark 3.1.2 and ElasticSearch official JARs. Official JARs only include elasticsearch-spark-20_2.11-8.6.1 with support for scala 2.11.

Solution: Instead, I downloaded the correct JAR with scala 2.12 and everything runs smoothly ...

pyspark --jars elasticsearch-spark-30_2.12-8.6.1.jar

>>> reader = spark.read.format('org.elasticsearch.spark.sql').option('es.nodes', 'ES_IP').option('es.port', 9200)
>>> read_df = reader.load('ES_INDEX')

Upvotes: 3

Rand Chen
Rand Chen

Reputation: 101

It looks like you are using different Scala version binaries.

please check again you imported spark compiled with the right Scala version.

according to maven dependencies, https://mvnrepository.com/artifact/org.elasticsearch/elasticsearch-hadoop/6.1.0

elasticsearch-hadoop:6.1.0 depends on the spark compiled with Scala 2.11, so you should choose a compatible spark version.

Upvotes: 2

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