"finish" service refactor + fix obvious bugs after refactor (everything should run pretty much)

src/main/resources/application-docker.properties

@@ -1,19 +1,30 @@
-application.name=gruppen2
-logging.pattern.console=[${application.name}],%magenta(%-5level), %d{dd-MM-yyyy HH:mm:ss.SSS}, %highlight(%msg),%thread,%logger.%M%n
-spring.datasource.platform=mysql
-spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
-spring.datasource.initialization-mode=NEVER
-spring.datasource.url=jdbc:mysql://dbmysql:3306/gruppen2
-spring.datasource.username=root
-spring.datasource.password=geheim
-keycloak.principal-attribute=preferred_username
-keycloak.auth-server-url=https://keycloak.cs.hhu.de/auth
-keycloak.realm=MOPS
-hhu_keycloak.token-uri=https://keycloak.cs.hhu.de/auth/realms/MOPS/protocol/openid-connect/token
-keycloak.resource=gruppenfindung
-keycloak.credentials.secret=fc6ebf10-8c63-4e71-a667-4eae4e8209a1
-keycloak.verify-token-audience=true
-keycloak.use-resource-role-mappings=true
-keycloak.autodetect-bearer-only=true
-keycloak.confidential-port=443
-management.endpoints.web.exposure.include=info,health
+# Logging
+logging.application.name                    = gruppen2
+logging.pattern.console                     = [${logging.application.name}],%magenta(%-5level), %d{dd-MM-yyyy HH:mm:ss.SSS}, %highlight(%msg),%thread,%logger.%M%n
+spring.output.ansi.enabled                  = always
+logging.level.mops.gruppen2                 = info
+logging.level.org.springframework.jdbc.core = info
+
+# Database
+spring.datasource.platform                  = mysql
+spring.datasource.driver-class-name         = com.mysql.cj.jdbc.Driver
+spring.datasource.initialization-mode       = never
+spring.datasource.url                       = jdbc:mysql://dbmysql:3306/gruppen2
+spring.datasource.username                  = root
+spring.datasource.password                  = geheim
+
+# Security
+keycloak.principal-attribute                = preferred_username
+keycloak.auth-server-url                    = https://keycloak.cs.hhu.de/auth
+keycloak.realm                              = MOPS
+hhu_keycloak.token-uri                      = https://keycloak.cs.hhu.de/auth/realms/MOPS/protocol/openid-connect/token
+keycloak.resource                           = gruppenfindung
+keycloak.credentials.secret                 = fc6ebf10-8c63-4e71-a667-4eae4e8209a1
+keycloak.verify-token-audience              = true
+keycloak.use-resource-role-mappings         = true
+keycloak.autodetect-bearer-only             = true
+keycloak.confidential-port                  = 443
+
+# Misc
+management.endpoints.web.exposure.include   = info,health
+server.error.include-stacktrace             = always