How to set encoding on docker image generated by Spring boot build-image maven plugin

Question

I've a project with spring boot 2.5.1

When I create the docker image with the following command

mvn -B spring-boot:build-image -Dspring-boot.build-image.imageName=franco -DskipTests

and then i run it with docker run franco

I see the following error

2021-06-25 10:23:11.173 ERROR 1 --- [ main] o.s.b.c.FileEncodingApplicationListener : System property 'file.encoding' is currently 'ANSI_X3.4-1968'. It should be 'UTF-8' (as defined in 'spring.mandatoryFileEncoding'). 2021-06-25 10:23:11.177 ERROR 1 --- [ main] o.s.b.c.FileEncodingApplicationListener : Environment variable LANG is 'null'. You could use a locale setting that matches encoding='UTF-8'. 2021-06-25 10:23:11.178 ERROR 1 --- [ main] o.s.b.c.FileEncodingApplicationListener : Environment variable LC_ALL is 'null'. You could use a locale setting that matches encoding='UTF-8'. 2021-06-25 10:23:11.397 ERROR 1 --- [ main] o.s.boot.SpringApplication : Application run failed

How can i set this env variable using the build-image goal?

it depends on the docker image/OS ... here exemplary for debian/ubuntu — xerx593
– xerx593, Commented Jun 25, 2021 at 10:54

Gavi · Accepted Answer · 2021-06-28 15:38:40Z

1

We can use the following in order to set the encoding

docker run -e JAVA_OPTS="-Dfile.encoding=UTF-8" <image_name>

answered Jun 28, 2021 at 15:38

Gavi

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