Question

I have a web application that is based on Spring. There is defined a bean that holds some class MyClass that is passed also with beans to MyEndpoint that extends AbstractMarshallingPayloadEndpoint.

MyClass has set some boolean parameter in beans to true.

If my application will change this parameter programically to false, does next request will have it also set to false or it will contains a default bean parameter – true ?

Answer 1

It depends on the scope of the bean (which will default to singleton, if you don’t specify one).

1. If it is of singleton scope, there is one instance of that bean in the application context, and each time you ask for that bean, you get that single instance. If you change it in a request with this scope, then the change will be maintained.
2. If it is of prototype scope, a new instance is given to you (created with the same parameters) each time you ask the application context for it. If you change it in a request with this scope, then the change will be ignored when you get another instance of this object.

These are the two most commonly used (at least with my time in Spring). There are other scopes (request, session, globalsession), but you should read the documentation on them that Spring provides.