You can inject Kubernetes ConfigMap values with Java EE & WildFly
This sample is based on https://blog.sebastian-daschner.com/entries/kubernetes_configmaps_javaee article.
ConfigMap values are persisted as properties files, those files are available in global WildFly module. Custom CDI producer for the properties can be used by your application to simplify usage.
Prerequisites:
- JDK 8 or newer - check
java -version - Maven 3 or newer - check
mvn -v
Setup EAP server (using absolute-resources, workaround for https://issues.jboss.org/browse/WFCORE-2765)
[[ -d properties ]] || mkdir properties
cat <<EOF > properties/application.properties
hello.greeting=Hi
hello.name=Rostislav
EOF
jboss-eap-7.1/bin/standalone.sh &
sleep 6
jboss-eap-7.1/bin/jboss-cli.sh -c --commands="
module add --name=org.experiments.rsvoboda --absolute-resources=properties,
/subsystem=ee:list-add(name=global-modules,value={name=org.experiments.rsvoboda}),
:shutdown(restart=true)"Setup WildFly / EAP server with WFCORE-2765 changes (allows properties directory inside modules)
echo "module add --name=org.experiments.rsvoboda --resources=properties --allow-nonexistent-resources
embed-server
/subsystem=ee:list-add(name=global-modules,value={name=org.experiments.rsvoboda})" | dist/target/wildfly-11.0.0.Beta1-SNAPSHOT/bin/jboss-cli.sh
cat <<EOF > dist/target/wildfly-11.0.0.Beta1-SNAPSHOT/modules/org/experiments/rsvoboda/main/properties/application.properties
hello.greeting=Hi
hello.name=Rostislav
EOF
dist/target/wildfly-11.0.0.Beta1-SNAPSHOT/bin/standalone.sh &Deploy, run and undeploy the application (second terminal recommended)
cd /home/rsvoboda/git/rsvoboda-playground/ConfigMapUsedInWildFly
mvn clean package wildfly:deploy
curl http://127.0.0.1:8080/ConfigMapUsedInWildFly/resources/hello
## you should see 'Hi, Rostislav!'
mvn wildfly:undeploy
Cleanup of EAP server
jboss-eap-7.1/bin/jboss-cli.sh -c --commands="
/subsystem=ee:list-remove(name=global-modules,value={name=org.experiments.rsvoboda}),
module remove --name=org.experiments.rsvoboda,
:shutdown"