Event monster bug (#265)

* Fix the first tamming mob (monster not killed)

* add Java 8 Compability

src/scripting/event/EventInstanceManager.java

@@ -616,6 +616,9 @@ public class EventInstanceManager {
                         
                         sL.lock();
                         try {
+                            if(ServerConstants.JAVA_8)
+                                  inc = (int)em.getIv().invokeFunction("monsterValue", this, mob.getId());
+                            else
                                    inc = ((Double) em.getIv().invokeFunction("monsterValue", this, mob.getId())).intValue();
                         } finally {
                                 sL.unlock();