Load from multiple labels does not work as expected when %00 (empty label) is used

[valmol]

Try to find: key=config.message and label=foo
Value with label foo does not exist, while values with empty label does exist.
Load from multiple labels does not work as expected when %00 (empty label) is used
It is expected to get a value with empty label

bootstrap.properties:

spring.cloud.azure.appconfiguration.stores[0].label=spring.cloud.azure.appconfiguration.stores[0].label= %00, foo

App config:

Key	Value	Cool
/application/config.message	Label	(No Label)
	Dev Label	dev
	Pro Label	pro

Library:

<dependency>
    <groupId>com.microsoft.azure</groupId>
    <artifactId>spring-cloud-azure-appconfiguration-config</artifactId>
    <version>1.2.2</version>
</dependency>

Azure App Configuration for Spring Cloud:
https://github.com/microsoft/spring-cloud-azure/tree/master/spring-cloud-azure-starters/spring-cloud-starter-azure-appconfiguration-config

Expected Behavior

Get "Label"

Current Behavior

Get "Pro Label"

Steps to Reproduce (for bugs)

• Create spring boot application: https://docs.microsoft.com/en-us/azure/azure-app-configuration/quickstart-java-spring-app
• Setup App Config using provided table
• Configure list of label values which include empty label value (%00) and just arbitrary label (bootstrap.properties)
• Fetch value in code

Your Environment

• SDK version: JDK 11

[mrm9084]

@valmol thanks for reporting the issue.

There seems to be a number of issues here. Documentation wise %00 is null which returns all values.

To get what you want your label value should be spring.cloud.azure.appconfiguration.stores[0].label= prod,, but that doesn't seem to work in the current version. I am looking into a solution to the issue.

There might be a bit of confusion here where the right most label has priority. So for example
spring.cloud.azure.appconfiguration.stores[0].label= a,b,c

Key	Value	Label
/application/config.message	Label A	a
	Label B	b
	Label C	c
/application/config.second	Second Value	a
	Second B	b
/application/config.third	Third Value	a

In this case the returned values would be
config.message= Label C
config.second= Second B
config.third= Third Value

[mrm9084]

@valmol This should be fixed in the new release 1.2.4, but is should be either
spring.cloud.azure.appconfiguration.stores[0].label=,foo
or
spring.cloud.azure.appconfiguration.stores[0].label=\0,foo

[saragluna]

@valmol Please try with 1.2.5 since we missed something in the release 1.2.4.

[mrm9084]

Fixed as a version 1.2.5. Let us know if their are any additional issues.