How to set system property in Java?

To set system property in Java, use System.setProperty.

Here's how you do it:

System.setProperty("myProperty", "Hello World!");

System.out.println(System.getProperty("myProperty")); // Hello World!

As a Java argument

You can also set it by passing an argument starting with -D to the java command:

java -DmyProperty="Hello World!" …