Common Settings

Settings You Will Use Often

Property	Default	Meaning
`server.port`	8080	HTTP port (use `0` for a random free port)
`server.servlet.context-path`	`/`	prefix for every URL, e.g. `/shopease`
`spring.application.name`	-	app name, shown in logs and used by Spring Cloud
`spring.profiles.active`	-	which profiles are active
`logging.level.*`	INFO	log levels per package
`spring.jackson.default-property-inclusion`	`always`	e.g. `non_null` to hide null fields in JSON
`spring.main.banner-mode`	`console`	`off` hides the Spring banner

Overriding Without Editing the File

Every property can be overridden at run time. Later sources win over earlier ones (simplified order):

application.properties / .yml  <  environment variables  <  command-line arguments
        (lowest)                       SERVER_PORT=9090            --server.port=9091
                                                                   (highest)

Example

Environment variable names are the property in upper case with dots and dashes replaced by underscores:

SERVER_PORT=9090 java -jar target/shopease-0.0.1-SNAPSHOT.jar
java -jar target/shopease-0.0.1-SNAPSHOT.jar --server.port=9091

Example output

... Tomcat started on port 9090 (http) with context path '/'
... Tomcat started on port 9091 (http) with context path '/'

Tip: On Windows PowerShell set the variable first: $env:SERVER_PORT=9090; java -jar ...

Practice

Exercise: Make ShopEase run on port 8085 with every URL starting with /shopease, and hide null fields in JSON. Write it in YAML.

Show answer

server:
  port: 8085
  servlet:
    context-path: /shopease
spring:
  jackson:
    default-property-inclusion: non_null
# Now: http://localhost:8085/shopease/ping