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POHow to start a daemon using Spring injection from a webapp
 

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  1. POHow to start a daemon using Spring injection from a webapp
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    <p>I need to start a daemon when I deploy a war. The daemon itself uses objects that should be injected with Spring. I did the following:</p> <p>In web.xml</p> <pre><code>... &lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/springapp-servlet.xml&lt;/param-value&gt; &lt;/context-param&gt; &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; &lt;/listener&gt; &lt;listener&gt; &lt;listener-class&gt;example.AppListener&lt;/listener-class&gt; &lt;/listener&gt; </code></pre> <p>AppListener.java</p> <pre><code>public class AppListener implements ServletContextListener { ... @Override public void contextInitialized(final ServletContextEvent sce) { log.info("======================= Begin context init ======================="); try { // final ApplicationContext context = new ClassPathXmlApplicationContext("WEB-INF/springapp-servlet.xml"); final ApplicationContext context = new ClassPathXmlApplicationContext("src/main/webapp/WEB-INF/springapp-servlet.xml"); //final ApplicationContext context = new ClassPathXmlApplicationContext("//Users/.../WEB-INF/springapp-servlet.xml"); final SessionServiceDaemon sessionServiceDaemon = context.getBean(SessionServiceDaemon.class); sessionServiceDaemon.start(); } catch (final Exception e) { log.error("Was not able to start daemon",e); } } </code></pre> <p>SessionServiceDaemon.java</p> <pre><code>@Service @Singleton public class SessionServiceDaemon { private final static Logger log = LoggerFactory.getLogger(SessionServiceDaemon.class); private final SessionServiceHandler handler; @Inject public SessionServiceDaemon(final SessionServiceHandler handler) { log.info("+++++++++++++++++++++++++++++++ SessionServiceDaemon injected"); this.handler = handler; } </code></pre> <p>My springapp-servlet.xml simply has the packages required for the injection:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans ... &lt;context:component-scan base-package="example" /&gt; &lt;mvc:annotation-driven /&gt; &lt;/beans&gt; </code></pre> <p>In the startup logs, I see as expected:</p> <pre><code>+++++++++++++++++++++++++++++++ SessionServiceDaemon injected </code></pre> <p>followed by</p> <pre><code>======================= Begin context init ======================= </code></pre> <p>Problem is: I then get an exception that the file does not exist no matter which path I use to point to springapp-servlet.xml:</p> <pre><code>org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [src/main/webapp/WEB-INF/springapp-servlet.xml]; nested exception is java.io.FileNotFoundException: class path resource [src/main/webapp/WEB-INF/springapp-servlet.xml] cannot be opened because it does not exist </code></pre> <p>I tried different relative paths and even the absolute path without success. I even edited the code above and added just above my attempt to load the context the following:</p> <pre><code> try { log.info(org.apache.commons.io.FileUtils.readFileToString(new File("src/main/webapp/WEB-INF/springapp-servlet.xml"))); } catch (final Exception e) { log.error("Unable to find file",e); } </code></pre> <p>and that printed the content of springapp-servlet.xml just fine.</p> <p>My 2 questions:</p> <ul> <li>How can I get a "class path resource [src/main/webapp/WEB-INF/springapp-servlet.xml] cannot be opened because it does not exist" when I am able to display the file content using the exact same path from the same method?</li> <li>Do I have the correct approach anyway for starting a Daemon that has dependencies that are injected?</li> </ul> <p>PS: I use Tomcat.</p>
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    1. COOn the classpath resource piece... `src/main/webapp` only exists in your maven project. Use a zip utility and you'd see that `WEB-INF` is in the root of your WAR, and `src/main/webapp` is nowhere to be found.
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      1. POHow to start a daemon using Spring injection from a webapp
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    2. COYes. Using new ClassPathXmlApplicationContext("WEB-INF/springapp-servlet.xml"); was actually my first attempt, but I got the same error. That's when I started using alternate relative and absolute paths.
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