Since we're on a major migration process of this website, some component documents here are out of sync right now. In the meantime you may want to look at the asciidoc in the repository: https://github.com/apache/camel/blob/master/README.md https://github.com/apache/camel/blob/master/components/readme.adoc

Running Camel standalone and have it keep running

If you are using Camel as a standalone Java application, then Camel provides a Main class you can reuse to more easily boot up Camel and keep it running until the JVM terminates, for example when pressing ctrl + c.

The Main class is provided in the following two components

  • camel-core JAR in the org.apache.camel.Main class (requires Camel 2.6)
  • camel-spring JAR in the org.apache.camel.spring.Main class

Using camel-core JAR example

Available as of Camel 2.6

The following example shows how you can create your main class, named MainExample and use the Main class from Camel.

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public class MainExample {

    private Main main;

    public static void main(String[] args) throws Exception {
        MainExample example = new MainExample();
        example.boot();
    }

    public void boot() throws Exception {
        // create a Main instance
        main = new Main();
        // bind MyBean into the registry
        main.bind("foo", new MyBean());
        // add routes
        main.addRouteBuilder(new MyRouteBuilder());
        // add event listener
        main.addMainListener(new Events());
        // set the properties from a file
        main.setPropertyPlaceholderLocations("example.properties");
        // run until you terminate the JVM
        System.out.println("Starting Camel. Use ctrl + c to terminate the JVM.\n");
        main.run();
    }

    private static class MyRouteBuilder extends RouteBuilder {
        @Override
        public void configure() throws Exception {
            from("timer:foo?delay={{millisecs}}")
                .process(new Processor() {
                    public void process(Exchange exchange) throws Exception {
                        System.out.println("Invoked timer at " + new Date());
                    }
                })
                .bean("foo");
        }
    }

    public static class MyBean {
        public void callMe() {
            System.out.println("MyBean.callMe method has been called");
        }
    }

    public static class Events extends MainListenerSupport {

        @Override
        public void afterStart(MainSupport main) {
            System.out.println("MainExample with Camel is now started!");
        }

        @Override
        public void beforeStop(MainSupport main) {
            System.out.println("MainExample with Camel is now being stopped!");
        }
    }
}

Using camel-spring JAR example

This would be similar to the camel-core JAR example, however you would use the Main class from the org.apache.camel.spring package.
The Main class from camel-spring JAR has many more options and is prepared for booting Camel from Spring XML files.

See Also

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