fix: Create ocpp services at startup

src/main/java/de/rwth/idsg/steve/config/OcppConfiguration.java

@@ -34,6 +34,10 @@
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.context.event.ContextRefreshedEvent;
+import org.springframework.context.event.ContextStartedEvent;
+import org.springframework.context.event.EventListener;
+import org.springframework.stereotype.Component;
 
 import java.util.Collection;
 import java.util.Collections;
@@ -56,10 +60,24 @@ public class OcppConfiguration {
         LogUtils.setLoggerClass(Slf4jLogger.class);
     }
 
+    private final CentralSystemService ocpp12Server;
+    private final ocpp.cs._2012._06.CentralSystemService ocpp15Server;
+    private final ocpp.cs._2015._10.CentralSystemService ocpp16Server;
+    private final List<Interceptor<? extends Message>> interceptors;
+    private final List<Feature> logging;
+    private final String routerEndpointPath;
+
     public OcppConfiguration(CentralSystemService ocpp12Server, ocpp.cs._2012._06.CentralSystemService ocpp15Server, ocpp.cs._2015._10.CentralSystemService ocpp16Server, @Qualifier("MessageHeaderInterceptor") PhaseInterceptor<Message> messageHeaderInterceptor) {
-        List<Interceptor<? extends Message>> interceptors = asList(new MessageIdInterceptor(), messageHeaderInterceptor);
-        List<Feature> logging = singletonList(LoggingFeatureProxy.INSTANCE.get());
+        this.ocpp12Server = ocpp12Server;
+        this.ocpp15Server = ocpp15Server;
+        this.ocpp16Server = ocpp16Server;
+        this.interceptors = asList(new MessageIdInterceptor(), messageHeaderInterceptor);
+        this.logging = singletonList(LoggingFeatureProxy.INSTANCE.get());
+        this.routerEndpointPath = CONFIG.getRouterEndpointPath();
+    }
 
+    @EventListener
+    public void afterStart(ContextRefreshedEvent event) {
         createOcppService(ocpp12Server, "/CentralSystemServiceOCPP12", interceptors, logging);
         createOcppService(ocpp15Server, "/CentralSystemServiceOCPP15", interceptors, logging);
         createOcppService(ocpp16Server, "/CentralSystemServiceOCPP16", interceptors, logging);
@@ -68,7 +86,7 @@ public OcppConfiguration(CentralSystemService ocpp12Server, ocpp.cs._2012._06.Ce
         // one to be created, since in MediatorInInterceptor we go over created/registered services and build a map.
         //
         List<Interceptor<? extends Message>> mediator = singletonList(new MediatorInInterceptor(springBus()));
-        createOcppService(ocpp12Server, CONFIG.getRouterEndpointPath(), mediator, Collections.emptyList());
+        createOcppService(ocpp12Server, routerEndpointPath, mediator, Collections.emptyList());
     }
 
     @Bean(name = Bus.DEFAULT_BUS_ID, destroyMethod = "shutdown")