Adding route builder when camel is already started doesn't respect startup order

[Schmeier, Jannik]

Hi all,

I'm using Apache Camel 3.4.4 in a Spring Boot 2.3.12 application. I know, that 
these aren't the most recent versions, but I'm currently not able to update to 
newer ones.

I'm trying to add a route builder dynamically after the camel context has 
already been started like so:

        camelContext.addRoutes(routeBuilder);

In general this is working and my routes are being added and started. However, 
adding a route builder like that doesn't seem to respect the startup orders 
that I have defined for my routes in that route builder. They're being started 
in the order that they're defined in the route builder.

The issue seems to be that inside this method 
https://github.com/apache/camel/blob/camel-3.4.4/core/camel-core-engine/src/main/java/org/apache/camel/impl/DefaultCamelContext.java#L346
 the route services are being started one after the other and not all together, 
resulting in the call to the internal startup order manager in 
https://github.com/apache/camel/blob/camel-3.4.4/core/camel-base/src/main/java/org/apache/camel/impl/engine/AbstractCamelContext.java#L3070
 basically being useless.

Does anyone know a way around this in Camel 3.4.4?

Best regards,
Jannik