Simplify setup for custom ProblemPostProcessor

README.md

@@ -239,13 +239,9 @@ quarkus.log.category.http-problem.level=OFF # disables all problems-related logg
 If you want to intercept, change or augment a mapped `HttpProblem` before it gets serialized into raw HTTP response 
 body, you can create a bean extending `ProblemPostProcessor`, and override `apply` method.
 
-**Important: Make sure your implementation is thread-safe, as it may potentially be called concurrently if multiple 
-requests throw exceptions at the same time.**
-
 Example:
 ```java
 @ApplicationScoped
-@Startup // makes sure bean is instantiated eagerly on startup
 class CustomPostProcessor implements ProblemPostProcessor {
     
     @Inject // acts like normal bean, DI works fine etc

deployment/src/main/java/com/tietoevry/quarkus/resteasy/problem/deployment/ProblemProcessor.java

@@ -5,8 +5,10 @@
 import static io.quarkus.deployment.annotations.ExecutionTime.STATIC_INIT;
 
 import com.tietoevry.quarkus.resteasy.problem.ProblemRuntimeConfig;
+import com.tietoevry.quarkus.resteasy.problem.postprocessing.ProblemPostProcessor;
 import com.tietoevry.quarkus.resteasy.problem.postprocessing.ProblemRecorder;
 import io.quarkus.arc.deployment.AdditionalBeanBuildItem;
+import io.quarkus.arc.deployment.UnremovableBeanBuildItem;
 import io.quarkus.deployment.Capabilities;
 import io.quarkus.deployment.annotations.BuildProducer;
 import io.quarkus.deployment.annotations.BuildStep;
@@ -169,6 +171,11 @@ void registerCustomPostProcessors(ProblemRecorder recorder) {
         recorder.registerCustomPostProcessors();
     }
 
+    @BuildStep
+    UnremovableBeanBuildItem markPostProcessorsUnremovable() {
+        return UnremovableBeanBuildItem.beanTypes(ProblemPostProcessor.class);
+    }
+
     @Record(RUNTIME_INIT)
     @BuildStep
     void applyRuntimeConfig(ProblemRecorder recorder, ProblemRuntimeConfig config) {

integration-test/src/main/java/com/tietoevry/quarkus/resteasy/problem/CustomPostProcessor.java

@@ -2,18 +2,11 @@
 
 import com.tietoevry.quarkus.resteasy.problem.postprocessing.ProblemContext;
 import com.tietoevry.quarkus.resteasy.problem.postprocessing.ProblemPostProcessor;
-import io.quarkus.runtime.Startup;
 import jakarta.enterprise.context.ApplicationScoped;
-import jakarta.inject.Inject;
-import jakarta.validation.Validator;
 
 @ApplicationScoped
-@Startup
 class CustomPostProcessor implements ProblemPostProcessor {
 
-    @Inject
-    Validator validator;
-
     @Override
     public HttpProblem apply(HttpProblem problem, ProblemContext context) {
         return HttpProblem.builder(problem)