Kernel Force created SPARK-40026:
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Summary: spark-shell can not instantiate object whose class is
defined in REPL dynamically
Key: SPARK-40026
URL: https://issues.apache.org/jira/browse/SPARK-40026
Project: Spark
Issue Type: Question
Components: Spark Shell
Affects Versions: 3.0.3, 2.4.8
Environment: Spark2.3.x ~ Spark3.0.x
Scala2.11.x ~ Scala2.13.x
Java 8
Reporter: Kernel Force
spark-shell throws {{NoSuchMethodException}} if I define a class in REPL and
then call {{newInstance}} via reflection.
{code:scala}
Spark context available as 'sc' (master = yarn, app id =
application_1656488084960_0162).
Spark session available as 'spark'.
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/___/ .__/\_,_/_/ /_/\_\ version 3.0.3
/_/
Using Scala version 2.12.10 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_141)
Type in expressions to have them evaluated.
Type :help for more information.
scala> class Demo {
| def demo(s: String): Unit = println(s)
| }
defined class Demo
scala> classOf[Demo].newInstance().demo("OK")
java.lang.InstantiationException: Demo
at java.lang.Class.newInstance(Class.java:427)
... 47 elided
Caused by: java.lang.NoSuchMethodException: Demo.<init>()
at java.lang.Class.getConstructor0(Class.java:3082)
at java.lang.Class.newInstance(Class.java:412)
... 47 more
{code}
But the same code works fine in native scala REPL:
{code:scala}
Welcome to Scala 2.12.10 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_131).
Type in expressions for evaluation. Or try :help.
scala> class Demo {
| def demo(s: String): Unit = println(s)
| }
defined class Demo
scala> classOf[Demo].newInstance().demo("OK")
OK
{code}
What's the difference between spark-shell REPL and native scala REPL?
I guess the Demo class might be treated as inner class in spark-shell REPL.
But ... how to solve the problem?
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