[FIXED] injecting directly to servlet instead of new ClassPathXmlApplicationContext

Issue

I have a big java project that contains many servlets. and each servlet needs to get objects from the same bean file using the following command:

ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");

and then I use

     context.getBean("<BEAN_NAME">);

some of them even needs to get same objects.

the question is if it's possible to inject the object that I want directly to the servlets without reading the bean file manually.

each servlet is configured in web.xml.

any information regarding the issue would be greatly appreciated!

thanks

Solution

Since you have a web application, I would go with a WebApplicationContext contained in spring-web, which is loaded at deploy-time of your web application and properly closed on undeploy. All you have to do is declaring the ContextLoaderListener in your web.xml:

<listener>
   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>/WEB-INF/applicationContext*.xml</param-value>
</context-param>

Then you can access your ApplicationContext from any servlet:

ApplicationContext ctx = WebApplicationContextUtils
    .getRequiredWebApplicationContext(getServletContext());
MyBean myBean = (MyBean) ctx.getBean("myBean");
myBean.doSomething();

The advantage is, that your context is shared between all servlets.

References:

• How to get the default WebApplicationContext?
• Integration of ContextLoaderListener
• WebApplicationContextUtils Javadoc

Answered By - nif
Answer Checked By - Candace Johnson (JavaFixing Volunteer)