Under Scala 2.13.3, get java.lang.NoClassDefFoundError: scala/Serializable

[plaurent]

Hi,

When building from the latest release (scala-parser-combinators_2.12-1.1.2-SNAPSHOT.jar) and running under Scala 2.13.3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_251), the simple test example compiles fine but I get java.lang.NoClassDefFoundError: scala/Serializable while running it:

import scala.util.parsing.combinator._
class SimpleParser extends RegexParsers {
  def word: Parser[String]    = """[a-z]+""".r ^^ { _.toString }
}

object TestSimpleParser extends SimpleParser {
  def main(args: Array[String]) = println(parse(word, "johnny come lately"))
}

Here's the output

$ scala TestSimpleParser
Exception in thread "main" java.lang.NoClassDefFoundError: scala/Serializable
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:468)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
	at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
	at java.lang.Class.getMethod0(Class.java:3018)
	at java.lang.Class.getMethod(Class.java:1784)
	at scala.reflect.internal.util.ScalaClassLoader.run(ScalaClassLoader.scala:101)
	at scala.reflect.internal.util.ScalaClassLoader.run$(ScalaClassLoader.scala:97)
	at scala.reflect.internal.util.ScalaClassLoader$URLClassLoader.run(ScalaClassLoader.scala:130)
	at scala.tools.nsc.CommonRunner.run(ObjectRunner.scala:29)
	at scala.tools.nsc.CommonRunner.run$(ObjectRunner.scala:28)
	at scala.tools.nsc.ObjectRunner$.run(ObjectRunner.scala:43)
	at scala.tools.nsc.CommonRunner.runAndCatch(ObjectRunner.scala:35)
	at scala.tools.nsc.CommonRunner.runAndCatch$(ObjectRunner.scala:34)
	at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala:70)
	at scala.tools.nsc.MainGenericRunner.run$1(MainGenericRunner.scala:91)
	at scala.tools.nsc.MainGenericRunner.process(MainGenericRunner.scala:103)
	at scala.tools.nsc.MainGenericRunner$.main(MainGenericRunner.scala:108)
	at scala.tools.nsc.MainGenericRunner.main(MainGenericRunner.scala)
Caused by: java.lang.ClassNotFoundException: scala.Serializable
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	... 29 more

Any suggestions on how to use this library with the latest version of Scala?

[SethTisue]

Scala versions are epoch.major.minor, and major versions aren't binary compatible with each other in either direction, as per https://docs.scala-lang.org/overviews/core/binary-compatibility-of-scala-releases.html . You cannot use a library built for 2.12 on 2.13, or vice versa. Thus, on 2.13, you need scala-parser-combinators_2.13 (not scala-parser-combinators_2.12).

If you are building the library yourself, do ++2.13.3 first, followed by publishLocal.

[plaurent]

Thanks!