Tuesday, April 5, 2016

WebLogic Scripting Tool (WLST) Variable Values

When using WebLogic Scripting Tool (WLST) there are two common mechanisms that can be employed to obtain variable values outside of a Jython (.py) script. You can obtain a value from:
  1. An environment variable, or
  2. A properties file.

Using Environment Variables

When you need to obtain the value of an environment variable, import the os package into your script. Then, use the getenv() method to get the value of a specific environment variable.

import os

javaHome = os.getenv("JAVA_HOME")
print("JAVA_HOME is " + str(javaHome))

Using a Properties File

When you need to obtain the value of a property, use the loadProperties() method. Using this method, there is no need to declare the variable and assign a value. Instead, the property.name becomes the name of the variable. The property.value is the assigned value. You will need to define a properties file, e.g. wlstExample.properties.

myProperty=myValue

In the WLST script, reference the loadProperties() method and provide a path to the properties file. If the properties file is in the same directory, and likely it is, do not use a relative path like ../wlstExample.properties. Instead, just use the file name.

loadProperties("wlstExample.properties")
print("The value of myProperty is " + str(myProperty))

When executed, this script produces the following output.

[oracle@myHost ~]$ java weblogic.WLST wlstExample.py

Initializing WebLogic Scripting Tool (WLST) ...

Welcome to WebLogic Server Administration Scripting Shell

Type help() for help on available commands

JAVA_HOME is /usr/java/jdk1.7.0_75
The value of myProperty is myValue

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