strange compilation error

Mirco Coppola

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Oct 19, 2015, 5:11:37 AM10/19/15

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Hi,

i have software project under scala-ide with mixed java and scala classes. I have a class named BulkImporter.scala and another class named Dispatcher.java.

In Dispatcher.java i wrote:
.....

if (response instanceof BulkImporter.Accepted$) {.....code...}

.....
The scala-ide give me a compilation error: BulkImporter.Accepted$ cannot be resolved to a type . Why?

I tried with another IDE and no compilation error found.

Can you help me please?

Many thanks
Mirco

Simon Schäfer

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Oct 19, 2015, 5:43:01 AM10/19/15

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On 10/19/2015 11:08 AM, Mirco Coppola wrote:

Hi,

i have software project under scala-ide with mixed java and scala classes. I have a class named BulkImporter.scala and another class named Dispatcher.java.

In Dispatcher.java i wrote:
.....

if (response instanceof BulkImporter.Accepted$) {.....code...}

.....
The scala-ide give me a compilation error: BulkImporter.Accepted$ cannot be resolved to a type . Why?

How is Accepted defined?

I tried with another IDE and no compilation error found.

Can you help me please?

Many thanks
Mirco

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Mirco Coppola

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Oct 19, 2015, 5:52:10 AM10/19/15

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Hi Simon,

many thanks for the quick response. Accepted is defined in a BulkImporter object. BulkImporter is a actor. I have attached the complete file.

object BulkImporter {

trait Response {}

case class ImportAll(completeImport: Try[Any] => Unit)

case object Accepted extends Response

case object Refused extends Response

case class ImporterConfiguration(batchSize: Int,
                                   workerCount: Int,
                                   enricherCount: Int,
                                   solrRequesterCount: Int,
                                   maxRows: Long)

}

Thanks!

BulkImporter.scala

Simon Schäfer

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Oct 19, 2015, 11:02:12 AM10/19/15

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On 10/19/2015 11:52 AM, Mirco Coppola wrote:

Hi Simon,

many thanks for the quick response. Accepted is defined in a BulkImporter object. BulkImporter is a actor. I have attached the complete file.

I think this is a bug in Eclipse Java support. Nothing we can do here. I suggest to not use scalac generates symbols from Java. If you need Java interop I would create a Java enum and send the enum to the Java consumer, this way you shouldn't get into any trouble regarding synthetic names.

object BulkImporter {

trait Response {}

case class ImportAll(completeImport: Try[Any] => Unit)

case object Accepted extends Response

case object Refused extends Response

case class ImporterConfiguration(batchSize: Int,
                                   workerCount: Int,
                                   enricherCount: Int,
                                   solrRequesterCount: Int,
                                   maxRows: Long)

}

Thanks!

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iulian dragos

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Oct 20, 2015, 4:41:15 AM10/20/15

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Just to add a suggestion to Simon's answer. Java interoperability is easiest when you stick to Java-like Scala (of course, this only needs to happen in the areas of contact). So, there's no top-level objects in Java, so better avoid them. I don't think you lose anything by moving all `case classes` to top-level.

Lastly, there are subtle differences between the Eclipse Java compiler and the Oracle Java compiler, so you'll sometimes have code that compiles in one but not the other. I guess the EJC could be fixed, if you wish you could try to open a ticket on the Eclipse issue tracker.

iulian

Thanks!

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