SpringBoot Empty value in spring.config.import causes NullPointerException

I consider an application-XXX.yml file with the following content:

spring.config.import: ./config/domain.yml,./config/webapp-azure.yml,

The trailing ',' led to the following error:

java.lang.NullPointerException: null
    at org.springframework.boot.context.config.ConfigDataEnvironment.getMandatoryImports(ConfigDataEnvironment.java:383)
    at org.springframework.boot.context.config.ConfigDataEnvironment.checkMandatoryLocations(ConfigDataEnvironment.java:364)
    at org.springframework.boot.context.config.ConfigDataEnvironment.applyToEnvironment(ConfigDataEnvironment.java:325)
    at org.springframework.boot.context.config.ConfigDataEnvironment.processAndApply(ConfigDataEnvironment.java:236)
    at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:97)
    at org.springframework.boot.context.config.ConfigDataEnvironmentPostProcessor.postProcessEnvironment(ConfigDataEnvironmentPostProcessor.java:89)
    at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEnvironmentPreparedEvent(EnvironmentPostProcessorApplicationListener.java:100)
    at org.springframework.boot.env.EnvironmentPostProcessorApplicationListener.onApplicationEvent(EnvironmentPostProcessorApplicationListener.java:86)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:176)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:169)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:143)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:131)
    at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:82)
    at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:63)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:117)
    at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:111)
    at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:62)
    at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:375)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)

It would be helpful if such a bad configuration is handled earlier, and if it reports the faulty file.

Comment From: scottfrederick

@blacelle Thanks very much for the report. We decided that the best approach to fixing this was to ignore empty elements in a comma-delimited list. A property value as in your example above should now load without an error.