mercredi 2 août 2017

Load a class at run time in a scala project

I would like to load some scala class at runtime, the class are presents in my scala project. More precisely, in the root folder of my project, I have the TmpCaseClass.scala :

class TmpHBaseCaseClass(val adresse:String,val age:Int,val nom:String,val id:Int,val salaire:Float)

I would like to compile it and use it at run time using toolBox like this :

val tb = universe.runtimeMirror(getClass.getClassLoader).mkToolBox()
  val clazz = tb.compile(tb.parse("./TmpCaseClass.scala"))().asInstanceOf[Class[_]]
  val ctor = clazz.getDeclaredConstructors()(0)
  val instance = ctor.newInstance()

But I encounter the follwing error :

Exception in thread "main" scala.tools.reflect.ToolBoxError: reflective compilation has failed:

illegal start of definition at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$ToolBoxGlobal.throwIfErrors(ToolBoxFactory.scala:316) at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$ToolBoxGlobal.parse(ToolBoxFactory.scala:291) at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$$anonfun$parse$1.apply(ToolBoxFactory.scala:417) at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$$anonfun$parse$1.apply(ToolBoxFactory.scala:414) at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$withCompilerApi$.liftedTree2$1(ToolBoxFactory.scala:355) at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl$withCompilerApi$.apply(ToolBoxFactory.scala:355) at scala.tools.reflect.ToolBoxFactory$ToolBoxImpl.parse(ToolBoxFactory.scala:414) at Main$.delayedEndpoint$Main$1(Main.scala:17) at Main$delayedInit$body.apply(Main.scala:13) at scala.Function0$class.apply$mcV$sp(Function0.scala:34) at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12) at scala.App$$anonfun$main$1.apply(App.scala:76) at scala.App$$anonfun$main$1.apply(App.scala:76) at scala.collection.immutable.List.foreach(List.scala:381) at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35) at scala.App$class.main(App.scala:76) at Main$.main(Main.scala:13) at Main.main(Main.scala)

The line 17 (where the error happens) corresponds to :

val clazz = tb.compile(tb.parse("./TmpHBaseCaseClass.scala"))().asInstanceOf[Class[_]]

How could I get rid of this error ?





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