在运行时更改@PropertySource值

Question

How can I change the value of @PropertySource in run time when the junit test case runs. For example,

I want to replace the value of below,

@PropertySource(value = "file:${app.deploy.env}/sample/mine.properties", ignoreResourceNotFound = true)

with

value = "classpath:sample/mine.properties"

when junit test runs.

Answer 1

You can do that if you really want to but I'd not recommend you to do that this way. You first need to figure out which PropertySource contains the value. Since you have that annotation in your example, a PropertySource will be added to the regular ones, probably as the first instance.

You can inject the Environment in a managed bean where you want to make that change as a ConfigurableEnvironment and retrieve the PropertySource via un call to getMutablePropertySources() on the environment.

Having said that. Why? How is changing such fundamental property of your application is representative of what is going to happen in your app. It looks like you are using the Spring runner and you'd like to start your app with different settings in different test methods. If that's what you want to do, do not use the runner but manage the context yourself, it's really not that hard.

For instance, here are JMS-related tests that change the Environment to test various scenarios. You can easily load the context with a specific set of keys and a @After method makes sure to shutdown the context for each test .

We use this pattern quite a lot in Spring Boot. As a matter of a fact, I have a JUnit rule that facilitates all that on my todo list for months now.