MuleESB / Apache Camel Interview Questions
What is a CamelContext and what is its lifecycle (start, stop, suspend, resume)?
The CamelContext is the central runtime container for a Camel application. It owns all routes, components, endpoints, type converters, the bean registry, data formats, and thread pools. Its lifecycle controls when routes are active and messages can flow.
| State | Method | What happens |
|---|---|---|
| Created | new DefaultCamelContext() | Object instantiated; no routes running. |
| Starting | context.start() | Components initialised; consumer endpoints begin polling. |
| Started | — | All routes active; messages flowing normally. |
| Suspending | context.suspend() | Consumers stop accepting; in-flight exchanges drain gracefully. |
| Suspended | — | Paused — useful for zero-downtime maintenance windows. |
| Resuming | context.resume() | Consumers reactivated. |
| Stopping | context.stop() | Graceful shutdown; thread pools terminated. |
| Stopped | — | Terminal state — create a new instance to restart. |
CamelContext ctx = new DefaultCamelContext();
ctx.addRoutes(new MyRouteBuilder());
ctx.start();
ctx.suspend(); // pause consumers gracefully
ctx.resume(); // re-activate consumers
ctx.stop(); // full shutdownIn Spring Boot, the CamelContext lifecycle is tied to the ApplicationContext. Individual routes can be started or stopped via context.startRoute(id) and context.stopRoute(id) without affecting other running routes.
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