ClassCastException

[BusyByte]

Which version and edition of Flyway are you using?

Started to see ClassCastException in sbt like in this gist
on our build server in drone

Rolled back from 10.11.0 to 10.10.0 of flyway and it resolved the issue.

Locally on my macbook it was working fine on the new version.

If this is not the latest version, can you reproduce the issue with the latest one as well? (Many bugs are fixed in newer releases and upgrading will often resolve the issue)

Which client are you using? (Command-line, Java API, Maven plugin, Gradle plugin)

maven dep from sbt

   val flywayV = "10.11.0"
   val flywayCore = "org.flywaydb" % "flyway-core" % flywayV
   val flywayPostgres = "org.flywaydb" % "flyway-database-postgresql" % flywayV

Which database are you using? (Type & version)

postgres 15.5 container

Which operating system are you using?

amazoncorretto 17 container

What did you do? (Please include the content causing the issue, any relevant configuration settings, the SQL statement(s) that failed (if any), and the command you ran)

What did you expect to see?

What did you see instead?

[arturaz]

The issue stems from the fact that Scala wrapper expects System.getProperties to be a Map[String, String]:

  case class JPropertiesWrapper(underlying: ju.Properties) extends mutable.AbstractMap[String, String]
            with mutable.Map[String, String]
            with mutable.MapLike[String, String, JPropertiesWrapper] {
    def iterator: Iterator[(String, String)] = new AbstractIterator[(String, String)] {
      val ui = underlying.entrySet.iterator
      def hasNext = ui.hasNext
      def next() = {
        val e = ui.next()
        (e.getKey.asInstanceOf[String], e.getValue.asInstanceOf[String])
      }
    }
}

(as it should be according to https://stackoverflow.com/questions/873510/why-does-java-util-properties-implement-mapobject-object-and-not-mapstring-st), while something puts a Boolean in the untyped Hashtable.

Given that changing the Flyway version rectifies the issue we believe that something is Flyway.

[amumurst]

Could it be this?
00db8d5#diff-79abf6b6049fba7bfa35d38f11d573e97773eaa9518250b82f1cddb246dd17b2R49

[arturaz]

Could it be this? 00db8d5#diff-79abf6b6049fba7bfa35d38f11d573e97773eaa9518250b82f1cddb246dd17b2R49

Seems likely, it should be systemProperties.put("polyglot.engine.WarnInterpreterOnly", "false");.

[pzygielo]

Because Properties inherits from Hashtable, the put and putAll methods can be applied to a Properties object. Their use is strongly discouraged as they allow the caller to insert entries whose keys or values are not Strings. The setProperty method should be used instead.

[JasonLuo-Redgate]

Hi @arturaz @amumurst @pzygielo , many thanks for raising this bug.
We will look into it.

[JasonLuo-Redgate]

This has been fixed and will be included in the next release of Flyway.