Oracle Database 19c UTF-8 encoding

Hi there,
i am currently using Oracle Database 19c with UTF-8 encoding.

From my application i use the REST Engine to deploy my processes.

Sadly letters like “ä” are saved as “ä” in my database.

I already tried to add “SET JAVA_OPTS=%JAVA_OPTS% -Dfile.encoding=UTF-8” to my start.bat file but no success.

Also if i add
spring.datasource:
url: jdbc:oracle:thin:@//myhost:1522/myorcldbservicename?useUnicode=yes&characterEncoding=UTF-8
to the default.yml brings no success.
I no longer know what to do… maybe someone of you can help.

My default.yml:

camunda.bpm:
database:
type: oracle
jdbc-batch-processing: false
schema-update: false
admin-user:
id: demo
password: demo
run:
cors:
enabled: true
allowed-origins: “*”

spring.datasource:
url: jdbc:oracle:thin:@//myhost:1522/myorcldbservicename?useUnicode=yes&characterEncoding=UTF-8
driver-class-name: oracle.jdbc.OracleDriver

username: CAMUNDA
password: 123

spring.web.resources:
static-locations: NULL