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    <p>This REPL session shows how you can invoke the setter with the Scala Reflection API:</p> <pre><code>scala&gt; import scala.reflect.runtime. { universe =&gt; ru } import scala.reflect.runtime.{universe=&gt;ru} scala&gt; trait TO { var age: Int = _ } defined trait TO scala&gt; class UMTInnerTO extends TO defined class UMTInnerTO scala&gt; val inner = new UMTInnerTO inner: UMTInnerTO = UMTInnerTO@173379f scala&gt; val m = ru.runtimeMirror(inner.getClass.getClassLoader) m: reflect.runtime.universe.Mirror ... scala&gt; val im = m.reflect(inner) im: reflect.runtime.universe.InstanceMirror = instance mirror for UMTInnerTO@173379f scala&gt; val setterSymb = (ru.typeOf[UMTInnerTO].members find (_.name.decoded == "age_=")).get setterSymb: reflect.runtime.universe.Symbol = method age_= scala&gt; val setter = im.reflectMethod(setterSymb.asMethod) setter: reflect.runtime.universe.MethodMirror = method mirror for TO.age_$eq(x$1: scala.Int): scala.Unit (bound to UMTInnerTO@173379f) scala&gt; inner.age res0: Int = 0 scala&gt; setter(5) res1: Any = () scala&gt; inner.age res2: Int = 5 </code></pre> <p>You may visit the <a href="http://docs.scala-lang.org/overviews/reflection/overview.html" rel="nofollow">Scala Reflection Documentation</a> to understand what is happening in the snippet.</p> <p>--</p> <p><strong>UPDATED</strong>: Anyway, if you are still interested in the Java API, here we go!</p> <p>You should be aware of <em>setters</em> in Scala don't use the Java naming convention. You won't find a <code>setAge</code> method (at least, if you don't declare it manually). Instead you have to search for an <code>age_=</code> method.</p> <pre><code>scala&gt; classOf[UMTInnerTO].getMethod("age_$eq", classOf[Int]) res0: java.lang.reflect.Method = public void UMTInnerTO.age_$eq(int) scala&gt; inner.age res1: Int = 0 scala&gt; res0.invoke(inner, 3: Integer) res2: Object = null scala&gt; inner.age res3: Int = 3 </code></pre> <p>This <a href="http://dustinmartin.net/getters-and-setters-in-scala/" rel="nofollow">post</a> on getters and setters could be helpful.</p>
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    1. COThanks. I have read the scala reflection api before:) And I thought the scala api is a little complex. I just want to get the setter, and getter method to call a normal class
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    2. COBut I add the @BeanProperty for each field. And I did get the setter of setAge
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    3. COI found this probleam is not so obvious, becuase if I execute the codes in REPL, it works. So I think it maybe a hidden bug in scala. I will dig further
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