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Apache Camel Interview Questions and Answers

Intermediate / 1 to 5 years experienced level questions & answers

Ques 1. What are various components in apache camel? Which ones have you used?

Apache camel provides us with a number of components. These components make interacting create endpoints with which a system can interact with other external systems. For example using an ActiveMQ component we expose an ActiveMQ endpoint for interaction with external system. There are more than 100 components provided by Apache Camel. Some of them are FTP, JMX, Webservices, HTTP. Apache camel also allows users to create custom components. It also provides different connector components to interact with Cloud services (AWS/Azure etc).

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Ques 2. How to make database calls using Apache Camel?

You can call database using apache camel component.

Maven dependency:
<dependency> 
      <groupId>mysql</groupId> 
     <artifactId>mysql-connector-java</artifactId> 
     <version>8.0.15</version> 
</dependency>

Coding example:
from(”debezium-mysql:dbz-test-1?offsetStorageFileName=/usr/offset-file-1.dat&databaseHostName=localhost&databaseUser=debezium&databasePassword=dbz&databaseServerName=my-app-connector&databaseHistoryFileName=/usr/history-file-1.dat”).log(”Event received from Debezium : ${body}”)

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Ques 3. How to expose a REST webservice endpoint using Apache Camel?

You can expose the REST webservice API endpoint using Apache camel  (JAX-RS or CXFRS).

  1. <dependency>  
  2.     <groupId>org.apache.camel</groupId>  
  3.     <artifactId>camel-cxf</artifactId>  
  4.     <version>2.12.0</version>  
  5. </dependency>  
 

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Ques 4. How did you execute JUnit test cases for Apache camel?

Using CamelSpringTestSupport.

  1. <dependency>  
  2.     <groupId>org.apache.camel</groupId>  
  3.     <artifactId>camel-test-spring</artifactId>  
  4.     <version>2.13.0</version>  
  5.     <scope>test</scope>  
  6. </dependency>  
 

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Ques 5. How are exception handled using Apache Camel?

Exception can be handled using the <try> <catch> block, <OnException> block or the <errorHandler> block.
The errorHandler is used to handle any uncaught Exception that gets thrown during the routing and processing of a message. Conversely, onException is used to handle specific Exception types when they are thrown.

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Ques 6. What is RouterContext?

It is now possible to define routes outside <camelContext/> which you do in a new <routeContext/> tag. The routes defined in <routeContext/> can be reused by multiple <camelContext/>. However its only the definition which is reused. At runtime each CamelContext will create its own instance of the route based on the definition.

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Ques 7. How to use Spring Boot with Apache Camel?

You can use Spring boot with Apache Camel.

Maven Dependency:
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-spring-boot-starter</artifactId>
    <version>2.17.0</version>
</dependency>

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