This sample application shows how to make it hawtio-enabled with Camel Spring Boot. Once deployed on OpenShift/Kubernetes, it will be discovered by Hawtio Online.
This project uses JKube kubernetes-maven-plugin to build a container image and deploy it to a Kubernetes/OpenShift cluster. JKube supports Jolokia out of the box and the default base image already includes Jolokia agent.
All you need to make the application hawtio-enabled is to define additional environment variables to the deployment resource to fine-tune the Jolokia agent options. By default, JKube plugin sets up a Jolokia agent with HTTPS and SSL client authentication enabled. The only necessary configurations are the client principal that matches the Hawtio Online instance (the default is hawtio-online.hawtio.svc) and the CA cert to specify service-ca.crt instead of the default ca.crt.
<plugin>
<groupId>org.eclipse.jkube</groupId>
<artifactId>kubernetes-maven-plugin</artifactId>
<version>${kubernetes-maven-plugin-version}</version>
<configuration>
<resources>
<env>
<!--
By default, JKube plugin sets up a Jolokia agent with HTTPS and
SSL client authentication enabled. The only necessary configurations
are the client principal that matches the Hawtio Online instance
(the default is `hawtio-online.hawtio.svc`) and the CA cert to
specify `service-ca.crt` instead of the default `ca.crt`.
-->
<AB_JOLOKIA_AUTH_OPENSHIFT>cn=hawtio-online.hawtio.svc</AB_JOLOKIA_AUTH_OPENSHIFT>
<AB_JOLOKIA_OPTS>caCert=/var/run/secrets/kubernetes.io/serviceaccount/service-ca.crt</AB_JOLOKIA_OPTS>
</env>
</resources>
</configuration>
</plugin>Run with:
mvn spring-boot:runThis example is intended to be used by deploying to a Kubernetes/OpenShift cluster.
To deploy it to a cluster, firstly change the container image name in pom.xml to fit your development environment. (The default image name is quay.io/hawtio/hawtio-online-example-camel-springboot:latest, which should be pushed to the hawtio organisation on Quay.io.)
<jkube.generator.name>quay.io/hawtio/%a:latest</jkube.generator.name>Then build the project and container image:
mvn package k8s:buildand push the image to the container registry so that Kubernetes/OpenShift can pull it at deployment:
mvn k8s:pushTo deploy it to Kubernetes/OpenShift:
mvn k8s:resource k8s:deployAfter deployment is successful and the pod has started, the application log can be seen on the cluster like this:
$ hawtio-online-example-camel-springboot
+ hawtio-online-example-camel-springboot-7f578548d6-s27j4 › spring-boot
Starting the Java application using /opt/jboss/container/java/run/run-java.sh ...
INFO exec java -javaagent:/usr/share/java/jolokia-jvm-agent/jolokia-jvm.jar=config=/opt/jboss/container/jolokia/etc/jolokia.properties -javaagent:/usr/share/java/prometheus-jmx-exporter/jmx_prometheus_javaagent.jar=9779:/opt/jboss/container/prometheus/etc/jmx-exporter-config.yaml -XX:MinHeapFreeRatio=10 -XX:MaxHeapFreeRatio=20 -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -XX:+ExitOnOutOfMemoryError -cp ".:/deployments/*" org.springframework.boot.loader.JarLauncher
_________________________________________
< Hawtio Online Camel Spring Boot Example >
-----------------------------------------
\ ^__^
\ (oo)\_______
(__)\ )\/\
||----w |
|| ||
I> No access restrictor found, access to any MBean is allowed
Jolokia: Agent started with URL https://172.17.11.234:8778/jolokia/
2023-11-23T03:51:12.505Z INFO 1 --- [ main] i.h.o.e.s.SampleSpringBootService : Starting SampleSpringBootService using Java 17.0.9 with PID 1 (/deployments/BOOT-INF/classes started by jboss in /deployments)
2023-11-23T03:51:12.512Z INFO 1 --- [ main] i.h.o.e.s.SampleSpringBootService : No active profile set, falling back to 1 default profile: "default"
2023-11-23T03:51:15.938Z INFO 1 --- [ main] o.a.c.i.e.DefaultCamelContextExtension : Detected: camel-debug JAR (Enabling Camel Debugging)
2023-11-23T03:51:17.021Z INFO 1 --- [ main] org.xnio : XNIO version 3.8.8.Final
2023-11-23T03:51:17.037Z INFO 1 --- [ main] org.xnio.nio : XNIO NIO Implementation Version 3.8.8.Final
2023-11-23T03:51:17.077Z INFO 1 --- [ main] org.jboss.threads : JBoss Threads version 3.5.0.Final
2023-11-23T03:51:17.502Z INFO 1 --- [ main] o.a.c.impl.engine.AbstractCamelContext : Apache Camel 4.1.0 (SampleCamelSpringBoot) is starting
2023-11-23T03:51:17.582Z INFO 1 --- [ main] o.a.c.component.quartz.QuartzComponent : Setting org.quartz.scheduler.jmx.export=true to ensure QuartzScheduler(s) will be enlisted in JMX
2023-11-23T03:51:17.617Z INFO 1 --- [ main] org.quartz.impl.StdSchedulerFactory : Using default implementation for ThreadExecutor
2023-11-23T03:51:17.621Z INFO 1 --- [ main] org.quartz.simpl.SimpleThreadPool : Job execution threads will use class loader of thread: main
2023-11-23T03:51:17.632Z INFO 1 --- [ main] org.quartz.core.SchedulerSignalerImpl : Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl
2023-11-23T03:51:17.633Z INFO 1 --- [ main] org.quartz.core.QuartzScheduler : Quartz Scheduler v.2.3.2 created.
2023-11-23T03:51:17.633Z INFO 1 --- [ main] org.quartz.simpl.RAMJobStore : RAMJobStore initialized.
2023-11-23T03:51:17.638Z INFO 1 --- [ main] org.quartz.core.QuartzScheduler : Scheduler meta-data: Quartz Scheduler (v2.3.2) 'DefaultQuartzScheduler-SampleCamelSpringBoot' with instanceId 'NON_CLUSTERED'
Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally.
NOT STARTED.
Currently in standby mode.
Number of jobs executed: 0
Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 10 threads.
Using job-store 'org.quartz.simpl.RAMJobStore' - which does not support persistence. and is not clustered.
2023-11-23T03:51:17.638Z INFO 1 --- [ main] org.quartz.impl.StdSchedulerFactory : Quartz scheduler 'DefaultQuartzScheduler-SampleCamelSpringBoot' initialized from an externally provided properties instance.
2023-11-23T03:51:17.638Z INFO 1 --- [ main] org.quartz.impl.StdSchedulerFactory : Quartz scheduler version: 2.3.2
2023-11-23T03:51:17.651Z INFO 1 --- [ main] o.a.c.component.quartz.QuartzEndpoint : Job Camel_SampleCamelSpringBoot.cron (cron=0/10 * * * * ?, triggerType=CronTriggerImpl, jobClass=CamelJob) is scheduled. Next fire date is 2023-11-23T03:51:20.000+0000
2023-11-23T03:51:17.688Z INFO 1 --- [ main] o.a.c.component.quartz.QuartzEndpoint : Job Camel_SampleCamelSpringBoot.simple (cron=null, triggerType=SimpleTriggerImpl, jobClass=CamelJob) is scheduled. Next fire date is 2023-11-23T03:51:17.685+0000
2023-11-23T03:51:17.733Z INFO 1 --- [ main] o.a.c.impl.engine.AbstractCamelContext : Routes startup (started:2)
2023-11-23T03:51:17.733Z INFO 1 --- [ main] o.a.c.impl.engine.AbstractCamelContext : Started cron (quartz://cron)
2023-11-23T03:51:17.733Z INFO 1 --- [ main] o.a.c.impl.engine.AbstractCamelContext : Started simple (quartz://simple)
2023-11-23T03:51:17.733Z INFO 1 --- [ main] o.a.c.impl.engine.AbstractCamelContext : Apache Camel 4.1.0 (SampleCamelSpringBoot) started in 230ms (build:0ms init:0ms start:230ms)
2023-11-23T03:51:17.735Z INFO 1 --- [ main] o.a.camel.impl.debugger.BacklogDebugger : Enabling Camel debugger
2023-11-23T03:51:17.735Z INFO 1 --- [ main] o.a.c.component.quartz.QuartzComponent : Starting Quartz scheduler: org.quartz.impl.StdScheduler@72b53f27
2023-11-23T03:51:17.740Z INFO 1 --- [ main] org.quartz.core.QuartzScheduler : Scheduler DefaultQuartzScheduler-SampleCamelSpringBoot_$_NON_CLUSTERED started.
2023-11-23T03:51:17.744Z INFO 1 --- [ main] i.h.o.e.s.SampleSpringBootService : Started SampleSpringBootService in 6.646 seconds (process running for 7.617)
Hello Camel! - simple
2023-11-23T03:51:17.788Z INFO 1 --- [melJMXConnector] o.a.c.c.debug.JmxConnectorService : JMX Connector thread started and listening at: service:jmx:rmi:///jndi/rmi://localhost:1099/jmxrmi/camel
Hello Camel! - cron
Hello Camel! - simple
Hello Camel! - cron
Hello Camel! - simple