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  • Book Overview & Buying Apache Camel Developer's Cookbook
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Apache Camel Developer's Cookbook

Apache Camel Developer's Cookbook

4.1 (17)
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Apache Camel Developer's Cookbook

Apache Camel Developer's Cookbook

4.1 (17)

Overview of this book

Apache Camel is a de-facto standard for developing integrations in Java, and is based on well-understood Enterprise Integration Patterns. It is used within many commercial and open source integration products. Camel makes common integration tasks easy while still providing the developer with the means to customize the framework when the situation demands it. Tasks such as protocol mediation, message routing and transformation, and auditing are common usages of Camel. Apache Camel Developer's Cookbook provides hundreds of best practice tips for using Apache Camel in a format that helps you build your Camel projects. Each tip or recipe provides you with the most important steps to perform along with a summary of how it works, with references to further reading if you need more information. This book is intended to be a reliable information source that is quicker to use than an Internet search. Apache Camel Developer's Cookbook is a quick lookup guide that can also be read from cover to cover if you want to get a sense of the full power of Apache Camel. This book provides coverage of the full lifecycle of creating Apache Camel-based integration projects, including the structure of your Camel code and using the most common Enterprise Integration patterns. Patterns like Split/Join and Aggregation are covered in depth in this book. Throughout this book, you will be learning steps to transform your data. You will also learn how to perform unit and integration testing of your code using Camel's extensive testing framework, and also strategies for debugging and monitoring your code. Advanced topics like Error Handling, Parallel Processing, Transactions, and Security will also be covered in this book. This book provides you with practical tips on using Apache Camel based on years of hands-on experience from hundreds of integration projects.
Table of Contents (14 chapters)
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13
Index

Marking exceptions as handled


The default behavior for Camel is to call your exception (or error) handler, and rethrow the exception to the caller. This recipe will show how to mark that exception as handled, which tells Camel that it should not consider this to be an error and nothing further needs to be done, that is, do not rethrow that particular exception to the consuming endpoint.

Getting ready

The Java code for this recipe is located in the org.camelcookbook.error.exception package. The Spring XML files are located under src/main/resources/META-INF/spring and prefixed with exception.

How to do it...

Within the onException DSL statement, specify a handled statement with a predicate that will indicate if the exception has been handled (predicate evaluates to true) or if it is not handled (predicate evaluates to false, so exception should be re-thrown).

In the XML DSL, define an onException element within either the camelContext or route element. Within the onException element include one...

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Apache Camel Developer's Cookbook
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