CODEWITHSUNDEEP
javaspringweb-applications
David
David

Reputation: 1023

Accessing Spring Bean without servlet/webapp context

I have a spring based webapp and I also have a background process. From inside the background process, I would like to be able to access spring beans. I normally retrieve spring beans by using:

ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
Object mySpringBean = context.getBean("mySpringBean");

The problem is that my background process is not servlet based and does not have access to the servletContext. The background process is triggered by a proprietary task execution program. This task execution program uses Class.forName to instantiate my background process and I am not permitted to modify the task execution program.

Is it possible for my background process to access spring beans? If so, how?

Upvotes: 0

Views: 2854

Answers (4)

aweigold
aweigold

Reputation: 6879

First off, my solution here is not ideal. Before using this, think about the architecture of your application, more than likely, you can make a structural change to get access to the context.

If you have multiple contexts you are maintaining, you will obviously need to add a bit more logic in here to sort them out.

You can create an ApplicationContextAware bean, and access your context via a static:

@Component
public class SpringApplicationContext implements ApplicationContextAware {

    private static ApplicationContext CONTEXT;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        CONTEXT = applicationContext;
    }

    public static <T> T getBean(Class<? extends T> beanClass) {
        return CONTEXT.getBean(beanClass);
    }

    protected static ApplicationContext getContext() {
        return SpringApplicationContext.CONTEXT;
    }
}

Another option, is if you have a way to register the context in your background process, you can do that in the setApplicationContext method.

Upvotes: 4

ndeverge
ndeverge

Reputation: 21564

Try using a org.springframework.context.support.ClassPathXmlApplicationContext for loading the Spring context :

ApplicationContext context = new ClassPathXmlApplicationContext("/path/to/applicationContext.xml");

Upvotes: 3

Eugene
Eugene

Reputation: 120858

How about this?`

ApplicationContext context = new ClassPathXmlApplicationContext("/spring-activemq/spring-activemq-producer-nio.xml");

All you have to do is specify where your XML is

Upvotes: 1

schtever
schtever

Reputation: 3250

Your background process must manually create the context. Typically this is done once during process initialization.

Something like:

ApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "appContext.xml" }, true );

Upvotes: 0

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