[TOREE-528] Unable to start kernel

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.4.0
• Fix Version/s: Not Applicable
• Component/s: Kernel
• Environment: Debian 10
• Assignee: Luciano Resende
• Reporter: Chris Van Houtte
• Created: 03/Jun/21 23:59
• Updated: 14/Jun/21 04:17
• Resolved: 14/Jun/21 04:17

Description

Hi there
I cannot start the kernel on Debian 10
$ scala -version
Scala code runner version 2.11.12 – Copyright 2002-2017, LAMP/EPFL

Followed the instructions here, in an anaconda environment
https://toree.apache.org/docs/current/user/installation/
The only deviation being adding the --user argument as follows
```
$ jupyter toree install --spark_home=/opt/spark-3.1.1-bin-hadoop3.2/ --user
```

Spark itself works fine via the terminal

 

Error message:

Starting Spark Kernel with SPARK_HOME=/opt/spark-3.1.1-bin-hadoop3.2/
21/06/04 11:46:08 WARN Utils: Your hostname, debian-ds resolves to a loopback address: 127.0.1.1; using 10.0.6.51 instead (on interface eno1)
21/06/04 11:46:08 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.apache.spark.unsafe.Platform (file:/opt/spark-3.1.1-bin-hadoop3.2/jars/spark-unsafe_2.12-3.1.1.jar) to constructor java.nio.DirectByteBuffer(long,int)
WARNING: Please consider reporting this to the maintainers of org.apache.spark.unsafe.Platform
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
21/06/04 11:46:08 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Exception in thread "main" java.lang.NoClassDefFoundError: scala/App$class
at org.apache.toree.Main$.<init>(Main.scala:24)
at org.apache.toree.Main$.<clinit>(Main.scala)
at org.apache.toree.Main.main(Main.scala)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:52)
at org.apache.spark.deploy.SparkSubmit.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:951)
at org.apache.spark.deploy.SparkSubmit.doRunMain$1(SparkSubmit.scala:180)
at org.apache.spark.deploy.SparkSubmit.submit(SparkSubmit.scala:203)
at org.apache.spark.deploy.SparkSubmit.doSubmit(SparkSubmit.scala:90)
at org.apache.spark.deploy.SparkSubmit$$anon$2.doSubmit(SparkSubmit.scala:1030)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:1039)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: scala.App$class
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)

Issue Links

• is duplicated by: TOREE-525 Validate Toree with Java 11