[keycloak-dev] ${...} enclosure in standalone.xml

Hi all, I want to use ${...} enclosure in standalone.xml like the following example: <subsystem xmlns="urn:jboss:domain:keycloak:1.0">     <secure-deployment name="app.war">         <realm>xxx</realm>         <resource>xxx</resource>         <realm-public-key>MIGfMA0GCSqGS</realm-public-key>         <auth-server-url>https://localhost:8443/auth</auth-server-url>         <truststore>${jboss.server.config.dir}../../certs/cert.jks</truststore>         <truststore-password>password</truststore-password>         <ssl-required>ALL</ssl-required>         <credential name="secret">6e12d2db</credential>     </secure-deployment> </subsystem> But I've got the following error: Caused by: java.lang.RuntimeException: org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token  at [Source: java.io.ByteArrayInputStream@27312e38; line: 1, column: 344] (through reference chain: org.keycloak.representations.adapters.config.AdapterConfig["truststore"]) at org.keycloak.adapters.KeycloakDeploymentBuilder.loadAdapterConfig(KeycloakDeploymentBuilder.java:102) at org.keycloak.adapters.KeycloakDeploymentBuilder.build(KeycloakDeploymentBuilder.java:91) at org.keycloak.adapters.undertow.KeycloakServletExtension.handleDeployment(KeycloakServletExtension.java:135) Does anyone know how to fix this? Thank you for your help! Michael