Camel Exception handling doesnt work if exception clause is defined in a separate class

Question

I am trying to build a application with several camel routes which re use many common routes internally. Hence, I am trying to segregate the routes in several different Rou

Answer 1

Based on the accepted answer, I found a cleaner way to implement exception handling, so you don't have to call super.configure() in every route. Just call a method that handles onException in the constructor of the base class.

//Base class that does exception handling
public abstracExceptionRouteBuildert class BaseAbstractRoute extends RouteBuilder {
  protected BaseAbstractRoute() {
    handleException();
  }

  private void handleException() {
    onException(Exception.class).handled(true).to("mock:error");
  }
}

//Extend the base class
public class MyRouteBuilder extends BaseAbstractRoute {
  @Override
  public void configure() throws Exception {
    from("direct:start").throwException(new Exception("error"));
  }
}

Answer 2

correct, the onException() clauses only apply to the current RouteBuilder's route definitions...

that said, you can reuse these definitions by having all your RouteBuilders extend the ExceptionRouteBuilder and call super.configure()...something like this

public class MyRouteBuilder extends ExceptionRouteBuilder {
    @Override
    public void configure() throws Exception {
        super.configure();
        from("direct:start").throwException(new Exception("error"));
    }
}
...
public class ExceptionRouteBuilder implements RouteBuilder {
    @Override
    public void configure() throws Exception {
        onException(Exception.class).handled(true).to("mock:error");
    }
}

or even just have a static method in an ExceptionBuilder class to setup the clauses for a given RouteBuilder instance

public class MyRouteBuilder extends RouteBuilder {
    @Override
    public void configure() throws Exception {
        ExceptionBuilder.setup(this);
        from("direct:start").throwException(new Exception("error"));
    }
}
...
public class ExceptionBuilder {
    public static void setup(RouteBuilder routeBuilder) {
        routeBuilder.onException(Exception.class).handled(true).to("mock:error");
    }  
}