I have this test code in a service:
import io.r2dbc.postgresql.codec.Json
// ...
logger.info("test")
val x = "{\"x\": \"ü\"}"
logger.info(x)
val typeRef = object : TypeReference<LinkedHashMap<String, String>>() {}
val xParsed = objectMapper.readValue(x, typeRef)
if (xParsed["x"] == "ü") {
logger.info("parsed ue correctly")
} else {
logger.info("converted ue incorrect")
}
val xJ = Json.of(x)
val xConverted = objectMapper.readValue(xJ.asString(), typeRef)
logger.info(xConverted["x"])
if (xConverted["x"] == "ü") {
logger.info("converted ue correctly")
} else {
logger.info("converted ue incorrect")
}
When run from the IDE, it works as expected. This is the log output:
2021-08-11 14:21:16.237 INFO 25810 --- [tor-tcp-epoll-1] some.feature.serviceImpl : test
2021-08-11 14:21:16.237 INFO 25810 --- [tor-tcp-epoll-1] some.feature.serviceImpl : {"x": "ü"}
2021-08-11 14:21:16.237 INFO 25810 --- [tor-tcp-epoll-1] some.feature.serviceImpl : parsed ue correctly
2021-08-11 14:21:16.238 INFO 25810 --- [tor-tcp-epoll-1] some.feature.serviceImpl : ü
2021-08-11 14:21:16.238 INFO 25810 --- [tor-tcp-epoll-1] some.feature.serviceImpl : converted ue correctly
When I run it from a docker container after building the image with ./gradlew bootBuildImage
the output of the container is:
backend_1 | 2021-08-11 12:25:28.905 INFO 9 --- [tor-tcp-epoll-1] some.feature.serviceImpl : test
backend_1 | 2021-08-11 12:25:28.905 INFO 9 --- [tor-tcp-epoll-1] some.feature.serviceImpl : {"x": "?"}
backend_1 | 2021-08-11 12:25:28.906 INFO 9 --- [tor-tcp-epoll-1] some.feature.serviceImpl : parsed ue correctly
backend_1 | 2021-08-11 12:25:28.906 INFO 9 --- [tor-tcp-epoll-1] some.feature.serviceImpl : ??
backend_1 | 2021-08-11 12:25:28.906 INFO 9 --- [tor-tcp-epoll-1] some.feature.serviceImpl : converted ue incorrect
As the log shows, the first part is fine, but after the Json
conversion the umlaut changed. Why and how can I fix this?
Turns out setting the env var JAVA_OPTS
to -Dfile.encoding=UTF8
fixes it. But I still don't understand why other services work fine that do not use a manual json conversion.
E.g. in docker-compose.yml
my_service:
image: the_image
ports:
- 8080:8080
environment:
JAVA_OPTS: "-Dfile.encoding=UTF8"