Spring Boot Override Properties Externally - spring

Question

I have a Spring Boot application that is getting deployed as a WAR to a Tomcat server. There is already a currently deployed Spring Boot application on Tomcat server that has an application.properties file on classpath that is overriding the one bundled in the WAR. I need to do the same thing for my application, but I can't use the name application.properties as it is already taken, and my application is trying to use the application.properties on the classpath from Tomcat, which is intended for the other Spring Boot application.
Is there a way I can tell Spring Boot to look for a properties file on the classpath called myapp.properties or something along those lines?
I tried doing the following, but it doesn't seem to work when being deployed as a WAR.
#SpringBootApplication
public class ParameterManagerApplication {
public static void main(String[] args) {
new SpringApplicationBuilder(ParameterManagerApplication.class)
.properties("spring.config.name:parameter-portal")
.build()
.run(args);
}
}

Answer 1

By default, Spring Boot looks for the application.properties file in these locations.
/config subdir of the working directory
The working directory
config package in the classpath
classpath root
So, the following worked for us when we placed myserver.properties under any of these locations.
public static void main(String[] args){
System.setProperty("spring.config.name","myserver");
SpringApplication.run(Application.class,args);
}
Otherwise, You can try setting the spring.config.location as below.
new SpringApplicationBuilder(Application.class)
.properties("spring.config.name:application,myserver",
"spring.config.location:classpath:/external/myproperties/")
.build().run(args);

Answer 2

We can also optionally define a custom source where we’re storing these properties, else the default location (classpath:application.properties) is looked up. So we now add the above annotations to the existing properties class:
#Configuration
#PropertySource("classpath:configprops.properties")
#ConfigurationProperties(prefix = "dev")
public class ConfigProperties {
// previous code
}
Now any properties defined in the property file that has the prefix dev and the same name as one of the properties are automatically assigned to this object.
#Simple properties
dev.host=mailer#mail.com
dev.port=9000
Check this