Details
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Bug
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Status: Open
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Major
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Resolution: Unresolved
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2.4.8, 3.0.3
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None
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None
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Spark2.3.x ~ Spark3.0.x
Scala2.11.x ~ Scala2.13.x
Java 8
Description
spark-shell throws NoSuchMethodException if I define a class in REPL and then call newInstance via reflection.
Spark context available as 'sc' (master = yarn, app id = application_1656488084960_0162).
Spark session available as 'spark'.
Welcome to
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/___/ .__/\_,_/_/ /_/\_\ version 3.0.3
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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
But the same code works fine in native scala REPL:
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
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?