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When you run Mule, your services (and their components) are initialised and ready to process inbound messages. Mule will create a new object instance for each request but this may not be what you want to happen.

Mule does this behind-the-scenes cloning of your component purely because it can. Doing so means that it can handle more inbound requests simultaneously and that is a good thing, of course. There are cases when you need (or must have) a singleton.

Firstly, if the component you’re using is declared using Spring:




then your component will be a singleton. Spring components are singletons by default.

Secondly, you can declare a component inside a service and insist that it should be a singleton using the element: