fix: removing infinite subscription loop (#2174)

docs/src/modules/java/pages/actions.adoc

@@ -232,9 +232,9 @@ The class `DoubleCounterAction` listens to the counter state changes. When the c
 ----
 include::example$java-spring-valueentity-counter/src/main/java/com/example/action/DoubleCounterAction.java[tag=controller-side-effect]
 ----
-<1> Retrieving the id of the counter.
+<1> Exposing dedicated endpoint.
 <2> On incoming request, doubling the value of `increase`.
-<3> Building a reply using `Confirmed.getDefaultInstance()`. And attaching a side effect, i.e. calling to the `Counter` to increase double the previous amount.
+<3> Building a reply and attaching a side effect, i.e. calling to the `Counter` to increase double the previous amount.
 
 NOTE: the response of the side effect is ignored by the command meaning that even if the deferred call to
 the `Counter` entity fails, the `Action` reply will succeed.

samples/java-spring-valueentity-counter/src/main/java/com/example/action/DoubleCounterAction.java

@@ -5,10 +5,10 @@
 import kalix.javasdk.action.Action;
 import com.example.Number;
 import kalix.javasdk.client.ComponentClient;
-import kalix.javasdk.annotations.Subscribe;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
 
 
-@Subscribe.ValueEntity(CounterEntity.class)
 public class DoubleCounterAction extends Action {
 
   final private ComponentClient componentClient;
@@ -18,13 +18,13 @@ public DoubleCounterAction(ComponentClient componentClient) {
   }
 
   // tag::controller-side-effect[]
-  public Action.Effect<Confirmed> increaseWithSideEffect(Integer increase) {
-    var counterId = actionContext().eventSubject().get(); // <1>
-    var doubleIncrease = increase * 2; // <2>
+  @PostMapping("/counter/{counterId}/double-increase/{value}") // <1>
+  public Action.Effect<String> increaseWithSideEffect(@PathVariable String counterId, @PathVariable int value) {
+    var doubleIncrease = value * 2; // <2>
     var deferredCall = componentClient.forValueEntity(counterId)
       .call(CounterEntity::increaseBy)
       .params(new Number(doubleIncrease));
-    return effects().reply(Confirmed.instance).addSideEffect(SideEffect.of(deferredCall));  // <3>
+    return effects().reply("ok").addSideEffect(SideEffect.of(deferredCall));  // <3>
   }
   // end::controller-side-effect[]
 }