[CONF] Apache Camel > Tutorial on using Camel in a Web Application

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Tutorial on using Camel in a Web Application Page edited by Claus Ibsen Changes (6) ... {code:xml} <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee version="2.5"> http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> <listener> ... http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://activemq.apache.org/camel/schema/spring http://camel.apache.org/schema/spring http://activemq.apache.org/camel/schema/spring/camel-spring.xsd"> http://camel.apache.org/schema/spring/camel-spring.xsd"> <camelContext xmlns="http://activemq.apache.org/camel/schema/spring"> xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="seda:foo"/> ... Full Content Tutorial on using Camel in a Web Application Camel has been designed to work great with the Spring framework; so if you are already a Spring user you can think of Camel as just a framework for adding to your Spring XML files. So you can follow the usual Spring approach to working with web applications; namely to add the standard Spring hook to load a /WEB-INF/applicationContext.xml file. In that file you can include your usual Camel XML configuration. Step1: Edit your web.xml To enable spring add a context loader listener to your /WEB-INF/web.xml file <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> </web-app> This will cause Spring to boot up and look for the /WEB-INF/applicationContext.xml file. Step 2: Create a /WEB-INF/applicationContext.xml file Now you just need to create your Spring XML file and add your camel routes or configuration. For example <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd"> <camelContext xmlns="http://camel.apache.org/schema/spring"> <route> <from uri="seda:foo"/> <to uri="mock:results"/> </route> </camelContext> </beans> Then boot up your web application and you're good to go! Hints and Tips If you use Maven to build your application your directory tree will look like this... src/main/webapp/WEB-INF web.xml applicationContext.xml To enable more rapid development we hightly recommend the jetty:run maven plugin. Please refer to the help for more information on using jetty:run - but briefly if you add the following to your pom.xml <build> <plugins> <plugin> <groupId>org.mortbay.jetty</groupId> <artifactId>maven-jetty-plugin</artifactId> <configuration> <webAppConfig> <contextPath>/</contextPath> </webAppConfig> <scanIntervalSeconds>10</scanIntervalSeconds> </configuration> </plugin> </plugins> </build> Then you can run your web application as follows mvn jetty:run Then Jetty will also monitor your target/classes directory and your src/main/webapp directory so that if you modify your spring XML, your web.xml or your java code the web application will be restarted, re-creating your Camel routes. If your unit tests take a while to run, you could miss them out when running your web application via mvn -Dtest=false jetty:run Change Notification Preferences View Online | View Changes | Add Comment