WLDF is a diagnostic framework inside Weblogic, which provides several functionalities to measure, track and monitor a domain at runtime. With WLDF, administrators can set alarms on specific incidents and automatically execute some tasks when certain events are triggered.
One good starting point to learn about WLDF is Radu Dobrinescu’s blog. It provides a compressive tutorial on how to monitor common events in Weblogic. The newest version of Weblogic (12.2.1) has made some changes and improvements to the WLDF Framework with the inclusion of the new smart rules.
Smart rules provide a set of predefined rules that represent the most common monitored events in Weblogic domains. This blog is going to show how to monitor stuck threads and overloaded datasources and send an email if one of these events occurs.
1. Creating a mail session
The first task required is to create a mail session in order to reference it in the WLDF watches. The following steps explain how to define a mail session.
- In the domain structure go to Services -> Mail Sessions -> New
- Enter a name, a JNDI name and your user account in Weblogic. In the JavaMail properties enter at least the host and port of the SMTP server and the sending email account, like this:
- Press “Next”.
- Select the server where you want to target this mail session and press “Finish”.
2. Create a Diagnostic Module
A diagnostic module is and administrative unit that contains collected metrics, instrumentations, policies and actions. The following steps show how to define a diagnostic module. Read the complete article here.
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