Unleash the power of Java API’s on your WLST scripts! By Maarten Smeets


clip_image001Oracle SOA Suite and many other Oracle products have extensive Java API’s to expose their functionality. WLST can often be used for relatively course grained actions. WLST (the version supplied in Weblogic 12.1.3) uses Jython 2.2.1. Jython is the Python scripting language implemented on the Java Virtual Machine. Jython allows easy integration with Java. In this article I describe how you can unleash the power of these Java API’s on your WLST scripts!

Why WLST and not Java?

For system operators, WLST is easier to work with than Java code. For Java code you need to supply all dependencies in the classpath and updating code requires recompilation. Also Java code can be a bit verbose compared to WLST code and requires (for most developers) more time to write. With a WLST script you do not need to provide dependencies since they are already present in the classpath set by the wlst.sh (of wlst.cmd) command used to start WLST scripts and you can more easily update the scripts without need for recompilation.

Why use Java classes in WLST?

In this example I wanted to create a script which undeployed composites which where not the default revision (are not called by default). Also I wanted to look at the instances. I did not want to undeploy composites which had running instances (long running instances like BPM and ACM). WLST provides some nifty features to undeploy composites; https://docs.oracle.com/middleware/1213/soasuite/wlst-reference-soa/custom_soa.htm#SOACR2689 for example the sca_undeployComposite command. I did however not see WLST commands I could use to query instances.

Undeploying composites using Java

I started out with a piece of Java code shown below. In order to make the required classes available in your project, you need to import Weblogic Remote Client, JRF API and SOA Runtime (see here for a more elaborate example of using the Java API). With the Locator class you can find your composites and instances. By calling the MBean oracle.soa.config:Application=soa-infra,j2eeType=CompositeLifecycleConfig,name=soa-infra method removeCompositeForLabel you can undeploy composites from Java. This is based on what I found at Read the complete article here.

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