Spring boot running a fully executable JAR and specify -D properties

Question

The Spring Boot Maven and Gradle plugins can now generate full executable archives for Linux/Unix operating systems.Running a fully executable JAR is as easy as typing:

$ ./myapp.jar 

My question is in this case how to set -D properties, e.g.

-Dspring.profiles.active=test 

In addition, if server does not install jdk , could this fully executable jar still run?

Answer 1

There are two ways to configure properties like that:

1:

By specifying them in a separate configuration file. Spring Boot will look for a file named like JARfilename.conf which should be stored in the same folder like the JAR file. There you can add the environment variable JAVA_OPTS:

JAVA_OPTS="-Dpropertykey=propvalue" 

2:

Or you can just specify the value for the environment variable in the shell before you execute the application:

JAVA_OPTS="-Dpropertykey=propvalue" ./myapp.jar 

Have a look at the documentation for the complete list of available variables: http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#deployment-service

Regarding your second question: To execute a JAR, you don't need a JDK, a JRE is sufficient (but you need at least that, if you don't have any java installed on the server, the application won't run).

Answer 2

By default SpringApplication will convert any command line option arguments (starting with ‘--’, e.g. --server.port=9000) to a property and add it to the Spring Environment. As mentioned above, command line properties always take precedence over other property sources.

e.g.

$ java -jar myapp.jar --spring.application.json='{"foo":"bar"}' 

please see http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/