Developer Partner Community

  • February 13, 2016

WebLogic Scripting for Ansible by René van Wijk

Juergen Kress
PaaS & Middleware Partner Adoption

clip_image001In order to write WebLogic scripts for automation tools such as Ansible (now - October 16, 2015 - acquired by Red Hat), we need to take care of idempotency. Before, we proceed with the scripts, we give a small introduction into the WebLogic Scripting Tool (WLST).

Introducing WLST

To enable JMX clients to control MBean life cycles, WebLogic MBeans contain operations that follow the design pattern for Java bean factory methods: for each child, a parent MBean contains a create<MBEAN_NAME> and a destroy<MBEAN-NAME> operation, where <MBEAN-NAME> is the short name of the MBean's type (the short name is the MBean's unqualified type name without the MBean suffix, for example, createCluster). The parent also contains a lookup<MBEAN_NAME> operation. The DomainMBean (or DomainMBean) is an example of a parent bean. To create a cluster, we call createCluster(String name). To see if a cluster already has been created, we use lookupCluster(String name). Instead of using lookup<MBEAN_NAME>, we can also use getPath and getMBean. In this case, we have to understand how WebLogic registers the MBeans, i.e., how the object names are structured. For example, to obtain an instance of the ClusterMBean, we can use

1.       cluster_bean_path = getPath('com.bea:Name=' + application_cluster_name + ',Type=Cluster');
2.       cluster = getMBean(cluster_bean_path);

The WebLogic Scripting Tool (WLST) can be used as the command-line equivalent to the WebLogic Server Administration Console (WLST online) or as the command-line equivalent to the Configuration Wizard (WLST offline). WLST offline has a few restrictions though, one them being: "offline edits are ignored by running servers", so in the following we will be using WLST online.

The Administration Server provides some common access points: Read the complete article here.

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