scala-java-interop

I defined a property in the constructor of my class the following way: class Step(val message:String = "") When I try access to message value from Java code y get a visbility error. Why? If you add the @scala.reflect.BeanProperty annontation you get "automatic" get and set methods See http://www.scala-lang.org/docu/files/api/scala/reflect/BeanProperty.html scala> class Step(@scala.reflect.BeanProperty val message:String ) defined class Step scala> val s = new Step("asdf") s: Step = Step@71e13a2c scala> s.message res6: String = asdf scala> s.getMessage res10: String = asdf The code is correct,

I was tying to convert this example for JsonPath to Scala. It should be easy with java like: List<String> authors = JsonPath.read(json, "$.store.book[*].author"); Which I converted to this Scala: val authors = JsonPath.read(json, "$.store.book[*].author"); Where json is a String. But I get this compile error. ambiguous reference to overloaded definition, both method read in object JsonPath of type [T](x$1: String, x$2: String, x$3: <repeated...>[com.jayway.jsonpath.Filter[_]])T and method read in object JsonPath of type [T](x$1: Any, x$2: String, x$3: <repeated...>[com.jayway.jsonpath.Filter[_

Below is a type-safe, fluid, builder pattern in Scala as described at http://www.tikalk.com/java/blog/type-safe-builder-scala-using-type-constraints . It's similar to Builder Library for Scala and Java , but deals specifically with compile-time builder checks. How can this called from Java? Can it be done with a clean API for Scala AND Java given the "scala.Predef$$eq$colon$eq" parameters? sealed trait TBoolean sealed trait TTrue extends TBoolean sealed trait TFalse extends TBoolean class Builder[HasProperty <: TBoolean] private(i: Int) { protected def this() = this(-1) def withProperty(i: Int

Scala doesn't have checked exceptions. However, when calling scala code from java, it's desirable to catch exceptions thrown by scala. Scala: def f()= { //do something that throws SomeException } Java: try { f() } catch (SomeException e) {} javac doesn't like this, and complains that "this exception is never thrown from the try statement body" Is there a way to make scala declare that it throws a checked exception? Use a throws annotation: @throws(classOf[SomeException]) def f()= { //do something that throws SomeException } You can also annotate a class constructor : class MyClass @throws

This question already has answers here : Closed 8 years ago . Possible Duplicate: How do I disambiguate in Scala between methods with vararg and without I am currently porting part of an application to scala and it uses the Oval library. The method is question is the Validator.validate method. It has two signatures : List<ConstraintViolation> validate(Object validatedObject) List<ConstraintViolation> validate(Object validatedObject, String... profiles) The scala code looks generally like this: def validate(toValidate: AnyRef) = { val validator = createValidator validator.validate(toValidate) }