javaw: set dependency between javac task and use-d generated jars nodes

demos/java/cats/src/org/example/Cat.java

@@ -6,9 +6,10 @@ import org.example.Animal;
 class Cat extends Animal {
 
     public String sound() {
+            // Use base class just to be able to trigger possible rebuilds based on base class change
+            String base = super.sound();
             return "Meow!";
     }
-           
 
 }
 

waflib/Tools/javaw.py

@@ -238,6 +238,7 @@ def use_javac_files(self):
 			if hasattr(y, 'jar_task'):
 				self.use_lst.append(y.jar_task.outputs[0].abspath())
 				self.javac_task.set_run_after(y.jar_task)
+				self.javac_task.dep_nodes.extend(y.jar_task.outputs)
 			else:
 				for tsk in y.tasks:
 					self.javac_task.set_run_after(tsk)