Fix ordering of SPRING_APPLICATION_JSON property source relative to servlet property sources

[windmueller]

I am trying to override servlet context parameters included in the web.xml of a Spring Boot war file. To achieve this, I added the environment variable SPRING_APPLICATION_JSON to the setenv.sh file of my Tomcat installation.

According to the documentation, the JSON config should be evaluated first. This is not the case, the valued from the web.xml are used instead.

While debugging PropertySourcesPropertyResolver, I discovered that the list of property resolvers has a different ordering than described in the documentation:

Is this a bug or is there any other way to override parameters from web.xml?

[mbhave]

It does look like there's a discrepancy between the docs and the actual behavior. The property source for SPRING_APPLICATION_JSON is ordered before jndiProperties but it doesn't seem to be doing anything about ordering it with respect to servletConfigInitParams and servletContextInitParams.

Let's see what the team thinks about what the correct behavior should be.