Spring Boot Language Server processing java.util.Properties type configuration logic error

[octoape]

Problem

Configure the property name spring.datasource.hikari.data-source-properties[v$session.program]=myappin application.properties.
But problem is that the spring boot language server prompts an error Can't use '[..]' navigation for property 'spring.datasource.hikari.data-source-properties' of type java.util.Properties.

Environment

Spring Boot: 2.2.8.RELEASE
Oracle JDK: 1.8.0_192
Eclipse: 2020-06 (4.16.0)
Spring Boot Language Server: 4.7.2.202009020949

Related issue

https://github.com/spring-projects/spring-boot/issues/23238

[kdvolder]

I can reproduce this issue.

Steps:

• create new boot project with web and actuator starter using initializer wizard
• Add the sample code as given by @shanlaomao to application.properties file.

=> error shown on the text between [..].

This is definitely something we should fix.

However for this particular example it seems like the '[..]' notation while it is indeed 'valid' and shouldn't be flagged as an error... is actually not necessary.

I create a property class myself to test this out:

package com.example.demo;

import java.util.Properties;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties("my")
public class MyProps {

	private Properties stuff = new Properties();

	public Properties getStuff() {
		return stuff;
	}

	
}

And I made my app read these properties and print them out to test how they get bound.

When I create a properties file like this:

my.stuff.v$session.program=myapp

The 'stuff' properties object gets populated with a map entry of v$session.program=myapp. So this seems like it doesn't need the [..] to escape the special characters at all (I think this because the java.util.Properties is a special case and doesn't support further navigation with .. So therefore it isn't necessary to escape these dots.

Anyhow long story short:

• yes this is a bug and we should fix it but...
• as a workaround I think you can simply use the notation without [..].

However, I am a little confused with comments from the other bug ticket. These suggest that using the . notation isn't working, in that example. But I don't understand why that would be the case... it seems to work fine for me with the property that I defined. Maybe there is something special about the properties in spring.datasource.hikari.data-source-properties ?

Maybe @wilkinsona can clarify.

Also I wonder if this behavior might vary on different versions of Spring Boot (I am trying this with Boot 2.4.M2 and there escaping the . seems not needed.

[kdvolder]

Okay, so switching my test app to Boot 2.2.8... and indeed in that case escaping is necessary. Without escaping the key becomes vsession.program instead of v$session.program.

[spring-projects-issues]

(comment in Pivotal Tracker added by Kris De Volder:)

Follow up ticket: https://www.pivotaltracker.com/story/show/174872660

I think we have similar issue in .yml and also the conversion from .properties to yml.