Trying to customize 404 error page from Camel Jetty - apache-camel

Question

I'm working on an osgi package with Apache Camel and Jetty and trying to customize the 404 error page but can't find a way
Reading on the internet indicates that it has to be done using an Error Handler.
I am trying to add the errorHandler as follows:
JettyHttpComponent9 jetty = getContext().getComponent("jetty", JettyHttpComponent9.class);
ErrorPageErrorHandler errorPageErrorHandler = new ErrorPageErrorHandler();
errorPageErrorHandler.addErrorPage(404,"http://localhost:8081/getActualDate");
jetty.setErrorHandler(errorPageErrorHandler);
But when I load the bundle in Karaf it shows me the following error:
java.lang.IllegalStateException: STARTED
at org.eclipse.jetty.server.handler.AbstractHandler.setServer(AbstractHandler.java:126) ~[?:?]
at org.eclipse.jetty.server.Server.doStart(Server.java:342) ~[?:?]
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:72) ~[?:?]
at org.apache.camel.component.jetty.JettyHttpComponent.connect(JettyHttpComponent.java:337) ~[?:?]
at org.apache.camel.http.common.HttpCommonEndpoint.connect(HttpCommonEndpoint.java:186) ~[?:?]
at org.apache.camel.http.common.HttpConsumer.doStart(HttpConsumer.java:58) ~[?:?]
at org.apache.camel.component.jetty.JettyHttpConsumer.doStart(JettyHttpConsumer.java:31) ~[?:?]
at org.apache.camel.support.service.BaseService.start(BaseService.java:119) ~[!/:3.14.3]
at org.apache.camel.support.service.ServiceHelper.startService(ServiceHelper.java:113) ~[!/:3.14.3]
at org.apache.camel.impl.engine.AbstractCamelContext.startService(AbstractCamelContext.java:3598) ~[!/:3.14.3]
at org.apache.camel.impl.engine.InternalRouteStartupManager.doStartOrResumeRouteConsumers(InternalRouteStartupManager.java:401) ~[!/:3.14.3]
at org.apache.camel.impl.engine.InternalRouteStartupManager.doStartRouteConsumers(InternalRouteStartupManager.java:319) ~[!/:3.14.3]
at org.apache.camel.impl.engine.InternalRouteStartupManager.safelyStartRouteServices(InternalRouteStartupManager.java:213) ~[!/:3.14.3]
at org.apache.camel.impl.engine.InternalRouteStartupManager.doStartOrResumeRoutes(InternalRouteStartupManager.java:147) ~[!/:3.14.3]
at org.apache.camel.impl.engine.AbstractCamelContext.doStartCamel(AbstractCamelContext.java:3300) ~[!/:3.14.3]
at org.apache.camel.impl.engine.AbstractCamelContext.doStartContext(AbstractCamelContext.java:2952) ~[!/:3.14.3]
at org.apache.camel.impl.engine.AbstractCamelContext.doStart(AbstractCamelContext.java:2903) ~[!/:3.14.3]
at org.apache.camel.support.service.BaseService.start(BaseService.java:119) ~[!/:3.14.3]
at org.apache.camel.impl.engine.AbstractCamelContext.start(AbstractCamelContext.java:2587) ~[!/:3.14.3]
at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:253) ~[!/:3.14.3]
at org.apache.camel.blueprint.BlueprintCamelContext.start(BlueprintCamelContext.java:241) ~[!/:3.14.3]
at org.apache.camel.blueprint.BlueprintCamelContext.maybeStart(BlueprintCamelContext.java:283) ~[!/:3.14.3]
at org.apache.camel.blueprint.BlueprintCamelContext.blueprintEvent(BlueprintCamelContext.java:188) [!/:3.14.3]
at org.apache.aries.blueprint.container.BlueprintEventDispatcher$3.call(BlueprintEventDispatcher.java:190) [!/:1.10.2]
at org.apache.aries.blueprint.container.BlueprintEventDispatcher$3.call(BlueprintEventDispatcher.java:188) [!/:1.10.2]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_302]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_302]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_302]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_302]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_302]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [?:1.8.0_302]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [?:1.8.0_302]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_302]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_302]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_302]
From what I understand the error says that since the component is already started it could not load the handler, but I don't know how to load it before it starts.
I am currently using Camel 3.14.3 with Karaf 4.2.8
Any help is appreciated
Edit:
Currently I load the data to build the routes from the database as follows:
configManager.getRoutes().forEach((apiBasePath, route) -> {
Predicate requiresAudit = PredicateBuilder.constant(route.getRequiresAudit());
Predicate requiresAuthorization = PredicateBuilder.constant(route.getRequiresAuthorization());
from(createInternalEndPoint(route)).routeId(route.getApiBasePath())
.setHeader(Exchange.HTTP_PATH,simple(route.getApiBasePath()))
.bean(gateway, "checkRoute")
.setHeader(Exchange.HTTP_PATH,simple("")) //Esto se hace para que no de error la ruta en TO
.choice()
...
.end()
.choice()
..
.end()
.circuitBreaker().resilience4jConfiguration(Resilience4JConfig.getConfig())
.to(createExternalEndPoint(route))
.onFallback()
.process(getShortCircuitedProcess())
.end()
.end()
});
In pom.xml I only have this dependency related to jetty:
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-jetty</artifactId>
</dependency>
I try to set the error handler before creating the routes (All in the same class that extends RouteBuilder).