Accessing cached ApplicationContext in spring

Question

I need to fetch a singleton bean from same ApplicationContext twice in 2 different classes.

Example snippet :

CLass A {
  public void foo(){
    ApplicationContext context = new ClassPathXmlApplicationContext("common.spring.xml");
    MyParametrizedSingletonClass myParametrizedSingletonClass = (MyParametrizedSingletonClass) context.getBean("myParametrizedSingletonClass");
    // do more stuff..
  }
CLass B {
  public void bar(){
    ApplicationContext context = new ClassPathXmlApplicationContext("common.spring.xml");
    MyParametrizedSingletonClass myParametrizedSingletonClass = (MyParametrizedSingletonClass) context.getBean("myParametrizedSingletonClass");
    // do more stuff..
  }

Since MyParametrizedSingletonClass is a singletom it if its constructor is called more than once for same constructor arguments it throws error.

How do I cache and reuse ApplicationContext with spring?

Why are you constructing the application context yourself, why aren't you injecting the dependency into Classes `A` and `B`? IMHO those should be spring managed to. — M. Deinum, Jun 18 '14 at 05:55

score 2 · Accepted Answer · edited May 23 '17 at 10:33

2

You are creating two different context, so even if bean is singleton it will create single instance per context,

if you want to cache application context you can create a class and provide singleton instance of application context

edited May 23 '17 at 10:33

Community

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answered Jun 18 '14 at 05:51

jmj

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score 0 · Answer 2 · answered Jun 18 '14 at 05:50

0

Autowire the bean.

By default the spring injects the autowired beans into required classes and these beans are not created an new everytime. They are singleton by default.

answered Jun 18 '14 at 05:50

Florescent Ticker

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score 0 · Answer 3 · answered Jun 18 '14 at 05:54

0

in common.spring.xml file for the bean name myParametrizedSingletonClass add the scope singleton to it as a parameter while defining the bean in the xml file

answered Jun 18 '14 at 05:54

Anoop George

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Accessing cached ApplicationContext in spring

3 Answers3