Set Java systemProperties for all Java Processes

Question

I have a system Property (JVM Provided) called networkaddress.cache.ttl. This setting has a bad default of -1 and should be set to a different value (e.g.: 60).

I know that this can be set by calling java -Dnetworkaddress.cache.ttl=60 -jar main.jar

Is there a way to set this value as a system-wide default, such that any process running java -jar main.jar would pick it up?

Answer 1

Check JAVA_TOOL_OPTIONS environment variable - https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/envvars002.html

You can set it to add JVM options to all Java processes.

In your case it should be set to

-Dnetworkaddress.cache.ttl=60

JVM process should output at the beginning:

Picked up JAVA_TOOL_OPTIONS: <your value>

If they pick your setting.

edit: alex

public class Main {
  public static void main(String[] args) {
    System.out.println(System.getProperties().get("foobar"));
  }
}

Test:

$ export JAVA_TOOL_OPTIONS='-Dfoobar=1'
$ java Main
Picked up JAVA_TOOL_OPTIONS: -Dfoobar=1 
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