add throws clauses to Java APIs

akka-actor/src/main/scala/akka/japi/JavaAPI.scala

@@ -93,6 +93,7 @@ object JavaPartialFunction {
 abstract class JavaPartialFunction[A, B] extends AbstractPartialFunction[A, B] {
   import JavaPartialFunction._
 
+  @throws(classOf[Exception])
   def apply(x: A, isCheck: Boolean): B
 
   final def isDefinedAt(x: A): Boolean = try { apply(x, true); true } catch { case NoMatch ⇒ false }

akka-testkit/src/main/java/akka/testkit/JavaTestKit.java

@@ -217,7 +217,7 @@ public class JavaTestKit {
   }
 
   public abstract class ReceiveWhile<T> {
-    abstract protected T match(Object msg);
+    abstract protected T match(Object msg) throws Exception;
 
     private Object results;
 
@@ -237,8 +237,8 @@ public class JavaTestKit {
     public ReceiveWhile(Class<T> clazz, Duration max, Duration idle, int messages) {
       results = p.receiveWhile(max, idle, messages,
           new CachingPartialFunction<Object, T>() {
-            public T match(Object msg) {
-              return ReceiveWhile.this.match(msg);
+            public T match(Object msg) throws Exception {
+                return ReceiveWhile.this.match(msg);
             }
           }).toArray(Util.classTag(clazz));
     }

akka-testkit/src/main/scala/akka/testkit/TestKit.scala

@@ -732,6 +732,7 @@ trait DefaultTimeout { this: TestKit ⇒
 private[testkit] abstract class CachingPartialFunction[A, B <: AnyRef] extends scala.runtime.AbstractPartialFunction[A, B] {
   import akka.japi.JavaPartialFunction._
 
+  @throws(classOf[Exception])
   def `match`(x: A): B
 
   var cache: B = _