Chapter 1. What is Red Hat JBoss Enterprise Application Platform Red Hat JBoss Enterprise Application Platform 8.0 (JBoss EAP) is a middleware platform built on open standards and compliant with the Jakarta EE 10 specification. It provides preconfigured options for features such as high-availability clustering, messaging, and distributed caching. It includes a modular structure that allows you to enable services only when required, which results in improved startup speed. By using the web-based management console and management command line interface (CLI), you can script and automate tasks and avoid having to edit XML configuration files. In addition, JBoss EAP includes APIs and development frameworks that you can use to develop, deploy, and run secure and scalable Jakarta EE applications. JBoss EAP 8.0 is a Jakarta EE 10 compatible implementation for Web Profile, Core Profile, and Full Platform specifications. 1.1. How does JBoss EAP work on OpenShift? Red Hat offers container images to build and run application images with JBoss EAP on OpenShift. Note Red Hat no longer offers images that contain JBoss EAP. 1.2. Comparison: JBoss EAP and JBoss EAP for OpenShift There are some notable differences when comparing the JBoss EAP product with the JBoss EAP for OpenShift image. The following table describes these differences and notes which features are included or supported in the current version of JBoss EAP for OpenShift. Table 1.1. Differences between JBoss EAP and JBoss EAP for OpenShift JBoss EAP Feature Status in JBoss EAP for OpenShift Description JBoss EAP management console Not included The JBoss EAP management console is not included in this release of JBoss EAP for OpenShift. JBoss EAP management CLI Not recommended The JBoss EAP management CLI is not recommended for use with JBoss EAP running in a containerized environment. Any configuration changes made using the management CLI in a running container will be lost when the container restarts. The management CLI is accessible from within a pod for troubleshooting purposes . Managed domain Not supported Although a JBoss EAP managed domain is not supported, creation and distribution of applications are managed in the containers on OpenShift. Default root page Disabled The default root page is disabled, but you can deploy your own application to the root context as ROOT.war . Remote messaging Supported Red Hat AMQ for inter-pod and remote messaging is supported. ActiveMQ Artemis is only supported for messaging within a single pod with JBoss EAP instances and is only enabled when Red Hat AMQ is absent. Transaction recovery Supported The EAP operator is the only tested and supported option of transaction recovery in OpenShift 4. For more information about recovering transactions using the EAP operator, see EAP Operator for Safe Transaction Recovery . 1.3. Version compatibility and support JBoss EAP for OpenShift provides images for OpenJDK 17 and OpenJDK 21 Two variant of the image are available: an S2I builder image and a runtime image. The S2I Builder image contains all the required tools that will enable you provision a complete JBoss EAP Server during S2I build. The runtime image contains dependencies needed to run JBoss EAP but does not contain a server. The server is installed in the runtime image during a chained build. The following modifications were applied to the images in JBoss EAP 8.0 for OpenShift. S2I builder image does not contain an installed JBoss EAP server and installs the JBoss EAP 8.0 server during S2I build. Configure the eap-maven-plugin in the application pom file during S2I build. Use existing JBoss EAP 7.4 application without any changes by setting GALLEON_PROVISION_FEATURE_PACKS , GALLEON_PROVISION_LAYERS , and GALLEON_PROVISION_CHANNELS environment variables during S2I build. The JBoss EAP provisioned server during S2I build contains a standalone.xml server configuration file customized for OpenShift. Important The sever contains a standalone.xml configuration file, not the standalone-openshift.xml configuration file that was used with JBoss EAP 7.4. Inside the image, JBOSS_HOME value is /opt/server . The value of JBOSS_HOME was /opt/eap for JBoss EAP 7.4. Jolokia agent is no longer present in the image. Prometheus agent is not installed. Python probes are no more present. SSO adapters are no longer present in the image. activemq.rar is no more present. Note The following discovery mechanism protocols were deprecated and are replaced by other protocols: The openshift.DNS_PING protocol was deprecated and is replaced with the dns.DNS_PING protocol. If you referenced the openshift.DNS_PING protocol in a customized standalone.xml file, replace the protocol with the dns.DNS_PING protocol. The openshift.KUBE_PING discovery mechanism protocol was deprecated and is replaced with the kubernetes.KUBE_PING protocol. 1.3.1. OpenShift 4.x support Changes in OpenShift 4.1 affect access to Jolokia, and the Open Java Console is no longer available in the OpenShift 4.x web console. In releases of OpenShift, certain kube-apiserver proxied requests were authenticated and passed through to the cluster. This behavior is now considered insecure, and so, accessing Jolokia in this manner is no longer supported. Due to changes in codebase for the OpenShift console, the link to the Open Java Console is no longer available. 1.3.2. IBM Z Support The s390x variant of libartemis-native is not included in the image. Thus, any settings related to AIO will not be taken into account. journal-type : Setting the journal-type to ASYNCIO has no effect. The value of this attribute defaults to NIO at runtime. journal-max-io : This attribute has no effect. journal-store-enable-async-io : This attribute has no effect. 1.3.2.1. Upgrades from JBoss EAP 7.4 to JBoss EAP 8.0 on OpenShift The file standalone.xml installed with JBoss EAP 7.4 on OpenShift is not compatible with JBoss EAP 8.0 and later. You must modify and rename the file to standalone.xml before starting a JBoss EAP 8.0 or later container for OpenShift. Additional resources Updates to standalone.xml when upgrading JBoss EAP 7.1 to JBoss EAP 8.0 on OpenShift . 1.3.3. Deployment options You can deploy the JBoss EAP Java applications on OpenShift using the EAP operator, a JBoss EAP-specific controller that extends the OpenShift API to create, configure, and manage instances of complex stateful applications on behalf of an OpenShift user. Additional resources For more information about the EAP operator, see EAP Operator for Automating Application Deployment on OpenShift .

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