How do I register beans in camel unit tests that use beans?

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I want to unit test single routes configured in java that uses beans. I read in camel in action (chapter 6.1.4) how to do this:

protected RouteBuilder createRouteBuilder() throws Exception {
    return new myRoute();
}

But in my case the rout needs some beans to be registered. I know how to register beans in standalone app: see here But how to register beans within "CamelTestSupport"? Is there a way to use beans without registry? Probably by injecting them (all beans hav no arg constructors)? I am using Guice and in my tests i am using Jukito (Guice+Mockito).

Afer Camel 3.0.0

You can now update the JNDI registry from anywhere you have access to the camel context.

context.getRegistry().bind("myId", myBean);

More info available here https://camel.apache.org/manual/latest/camel-3-migration-guide.html#_camel_test

Before Camel 3.0.0

You need to override the createRegistry() method,

@Override
protected JndiRegistry createRegistry() throws Exception {
    JndiRegistry jndi = super.createRegistry();

    //use jndi.bind to bind your beans

    return jndi;
}

@Test
public void test() {
    //perform test
}

Chapter 4. Using beans with Camel, Understanding the Service Activator EIP; How Camel looks up beans using registries; In the Java DSL, you don't have to preregister the bean in the registry. For example, if you wanted to unit test the HelloBean example, you could use the� You can mark a method in your bean with the @Handler annotation to indicate that this method should be used for Bean Binding. This has an advantage as you need not specify a method name in the Camel route, and therefore do not run into problems after renaming the method in an IDE that can’t find all its references.

No, you cannot use beans without registry.

You need to use the registry to hold the beans instance, otherwise Camel cannot look up the bean for you. You just need to override the createRegistry() method to setup right registry with your beans if your test class extends CamelTestSupport.

Chapter 4: Using beans with Camel, Figure 4.3 A requester looks up a bean using the Camel registry, which then uses the Spring Listing 4.5 Using SimpleRegistry to unit-test a Camel route. Whenever Camel invokes a bean method via one of the above methods (Bean component, Spring Remoting or POJO Consuming) then the Bean Binding mechanism is used to figure out what method to use (if it is not explicit) and how to bind the Message to the parameters possibly using the Parameter Binding Annotations or using a method name option.

The answer provided by @Matthew Wilson is no longer recommended starting with Camel 3.0.0

His solution is still in the ballpark but the implementation details have changed. I have chosen to inject it in setUp (the example is in Kotlin, use your IDE hints to produce the same in Java):

override fun setUp() {
    super.setUp()
    context.registry.bind("yourBean", YourBean())
}

As you can see, the registry is still involved but now you can only get it from the context. I consider it cleaner to keep these kinds of setup routines in the conveniently named overrideable method setUp. Just don't forget to call the parent version.

If there is a better place to put this kind of routines in, let me know so I can upgrade the answer.

Docs: https://camel.apache.org/manual/latest/camel-3-migration-guide.html

How does Camel look up beans, components or endpoints , Camel uses the Registry to resolve names when looking up beans or don't use Spring (as camel-core explicitly doesn't depend on spring) - though test cases� What happens is that when the exchange is routed to the myBean Camel will use the Bean Binding to invoke the bean. The source for the bean is just a plain POJO: Camel will use Bean Binding to invoke the sayHello method, by converting the Exchange’s In body to the String type and storing the output of the method on the Exchange Out body.

Bean Injection :: Apache Camel, How do I reuse the ContextTestSupport class in my unit tests? Endpoint instances which can be used for testing when used with Mock From Camel 2.13 onwards you can inject beans (obtained from the Registry) into And then in a Java RouteBuilder class, you can inject the bean using @BeanInject as shown below:. Unit testing is an important part of the development process, so important in fact that some methodologies, including Agile , require that the unit test be written before the class that it will be testing. Certainly writing the unit test first will give you a very clear idea of the use case for your class file.

Correctly Using Camels AdviceWith in Unit Tests, If youre using the bean integration and referring to beans by name in your camel routes, youll need to register those names with an instance of� How do I reuse the ContextTestSupport class in my unit tests? How do I run ActiveMQ and Camel in JBoss? How do I set the max chars when debug logging messages in Camel? How do I use a big (uber) JAR? How do I use Camel inside ServiceMix? How do I use Spring Property Placeholder with Camel XML? How do I use URIs with parameters in XML?

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Comments
  • if i want to use the same registry in test as in my normal code how to reuse the registry? i don't want to copy paste the code - if it changes the test will fail. Is there a way to give (or get/set) the main a JndiRegistry?
  • the hack I used was to add hook into the doPostSetup() method the test harness provides to call the method used to setup the registry in the CamelContextListener class for the prod context. a bit of boilerplate plumbing to be sure but it's not much and it ensures both prod and test have the same registry.
  • I guess I can only edit a comment for 5m (??) so posting better phrasing. where OP has '//use jndi.bind' you can directly call the method in your CamelContextLifecycle class that handles the registry for prod. the camel context seems to be set up at this point so it's pretty easy to get both prod and test contexts to use the same registry population code
  • Your answer is no longer recommended as of Camel 3.0.0 due to some things being deprecated. Check out my answer if you are migrating