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recently I swapped from thorntail to quarkus and I'm facing some difficulties trying to find how to set environment variables in application.properties in thorntail I used something like this ${env.HOST: localhost} that basically means put environment variable, if you don't find anything put localhost as default is that possible to quarkus application.properties? I haven't found any issue on GitHub or someone that have an answered this problem?

Theodosis
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2 Answers2

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In application.properties you can use:

somename=${HOST:localhost}

which will correctly expand the HOST environment variable and use localhost as the default value if HOST is not set.

See this for more information.

geoand
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  • It does work with the latest versions of Quarkus (I've tested for versions >= 1.1) – geoand Feb 21 '20 at 19:18
  • What about int default values can we just use -1 as in this example? ``` quarkus.mailer.from=${SYSTEM_EMAIL:-} quarkus.mailer.port=${EMAIL_SERVER_PORT:-1} ``` To specify empty string using `-` and default-int is `-1` – Hhovhann Feb 05 '21 at 13:24
  • I am not sure I understand your problem. Can you try and explain it a little more? – geoand Feb 07 '21 at 05:39
  • I mean I am using for defaut values `-` for empty string and `-1` for int initial values. Is this correct usages ? Cannot find any best practises about this in Quarkus docs. – Hhovhann Feb 08 '21 at 06:48
  • You can alternatively make the Java field `Optional` and not have to pass a default value – geoand Feb 08 '21 at 07:28
  • Yes, but in my case I am using those values vor mailing integration and not injecting them as a fields. Probably will upgrade platform to 1.11.1.final soon, where we have warnings instead of server keystore error when using ${HOST} without default values – Hhovhann Feb 09 '21 at 08:23
  • Where is this documented ?not at https://quarkus.io/guides/config – puio Jun 06 '23 at 08:28
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    https://quarkus.io/guides/config-reference#property-expressions – geoand Jun 06 '23 at 11:28
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Alternatively, you do not need refere environment variable in application.properties, just refere variable in your code directly:

@ConfigProperty(name = "my.property", defaultValue = "default value")
String myProperty;

and specify it using env variable like this:

export MY_PROPERTY="env var" && java -jar myapp.jar

or using command line definition -D

java -Dmy.property="CL key" -jar myapp.jar

Please refere Quarkus configuration guide https://quarkus.io/guides/config

S. Kadakov
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