ClassNotFoundException

(Julien Perret) #1

I have a model in a scala project that throws a ClassNotFoundException when run from openmole.
The task is defined in my jar (built with sbt osgiBundle) like that:

object hmmmatcher {
def run(…)
}

Then, my workflow uses that task:

val hmmmatcherTask = ScalaTask(“val m = fr.ign.nm.hmmmatcher.run(…)”) set (
libraries += workDirectory / “nm_2.12-1.0-SNAPSHOT.jar”,
…
)

The error thrown is:
org.openmole.core.exception.InternalProcessingError: Error for context values in org.openmole.core.workflow.tools.InputOutputCheck$@4b77d812 {fileNetwork1=/home/julien/.openmole/michele-julien-1/webui/projects/nm/snapshot_1825.0_1836.0_edges.shp, fileNetwork2=/home/julien/.openmole/michele-julien-1/webui/projects/nm/snapshot_1784.0_1791.0_edges.shp, idAttribute1=ID, idAttribute2=ID, lpsolving=0.0, openmole$seed=-7076074100557766095, resampling=0.0, selection=10.0, stroke_length=10.0}
Caused by: java.lang.NoClassDefFoundError: fr/ign/nm/hmmmatcher$
at $line3.$read$$iw$$iw$$anonfun$1.apply(:25)
… 32 more
Caused by: java.lang.ClassNotFoundException: fr.ign.nm.hmmmatcher$
at scala.reflect.internal.util.AbstractFileClassLoader.findClass(AbstractFileClassLoader.scala:62)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
… 33 more

I checked in the jar and the class is there (and in the MANIFEST too as exported).
Any idea?

Thanks
Julien

#2

Do you use the version 2.12 of scala for your model?

(Julien Perret) #3

Yes, why?

#4

Just like that… and did you brush your teeth? :slight_smile:

It is hard to guess why it is not working. If your courageous you could inspect the classPath generated by the ScalaTask using println to check what’s going wrong.

(Julien Perret) #5

Ok, how do I do that?

#6

You add some println in the code of the ScalaTask in OpenMOLE to try to guess what’s going wrong. I think the first thing is to make sure that your jar is in the class path of the scala compilator of the task.

(Julien Perret) #7

So I changed my script to:
val hmmmatcherTask = ScalaTask("""
|println(System.getProperty(“java.class.path”));
|val matches = fr.ign.nm.hmmmatcher.runFromDouble(…)""".stripMargin) set (
libraries += workDirectory / “nm_2.12-1.0-SNAPSHOT.jar”,
…
)

and the classpath is:
/home/julien/devel/openmole/launcher/org-openmole-launcher_2.12-7.0-SNAPSHOT.jar:/home/julien/devel/openmole/launcher/osgi.jar

so it does not contain the library…

#8

This is the class path of the jvm no the one of the ScalaTask. In the ScalaTask you have this code:

 def compile(implicit newFile: NewFile, fileService: FileService) = {
    implicit def m = manifest[java.util.Map[String, Any]]
    ScalaCompilation.static(
      sourceCode,
      inputs.toSeq,
      ScalaCompilation.WrappedOutput(outputs),
      libraries = libraries,
      plugins = plugins
    )
  }

This scala compilation object is what will handle the class path. If you feel courageous you might want to dig into it to check what is going wrong…

(Julien Perret) #9

How do I get the classpath used by the scalaTask?

#10

I don’t remember exactly, you’ll have to inspect how the ScalaCompilation object works…