WAS v8.5 > Script the application serving environment (wsadmin) > Use properties files to manage system configuration > Manage specific configuration objects using properties files > Work with server properties files > Work with application server properties files

Work with class loader properties files

We can use properties files to create or change PARENT_LAST class loader properties under the ApplicationServer object of a server.

Determine the changes to make to your class loader configuration or its configuration objects.

Start the wsadmin scripting tool. To start wsadmin using the Jython language, run the wsadmin -lang jython command from the bin directory of the server profile. Using a properties file, we can create, modify, or delete a class loader object and its configuration properties.

Run administrative commands using wsadmin to create or change a properties file for a class loader, validate the properties, and apply them to your configuration.

Actions for PARENT_LAST class loader properties files. We can create, modify, and delete class loader configuration properties.

Action	Procedure
create	Set properties and then run the applyConfigProperties command.
modify	Edit properties and then run the applyConfigProperties command.
delete	Uncomment #DELETE=true and run the deleteConfigProperties command.

Optionally, we can use interactive mode with the commands:

AdminTask.command_name('-interactive')

• Create a class loader and its properties.

  1. Create a properties file for a Classloader object.

     Open an editor and create a class loader properties file. We can copy an example properties file in this step into an editor and modify the properties as needed for the situation.

     The following example defines a class loader with mode PARENT_LAST under an ApplicationServer object of a server:

     #
     # SubSection 1.0.0 # ApplicationServer Classloader
     #
     ResourceType=Classloader
     ImplementingResourceType=GenericType
     ResourceId=Cell=!{cellName}:Node=!{nodeName}:Server=!{serverName}:ApplicationServer=:Classloader=mode#PARENT_LAST
     AttributeInfo=classloaders
     #DELETE=true
     
     #
     #Properties
     #
     mode=PARENT_LAST #ENUM(PARENT_FIRST|PARENT_LAST),default(PARENT_FIRST)

  2. Run the applyConfigProperties command to create a class loader configuration.

     Running the applyConfigProperties command applies the properties file to the configuration. In this Jython example, the optional -reportFileName parameter produces a report named report.txt:

     AdminTask.applyConfigProperties(['-propertiesFileName myObjectType.props -reportFileName report.txt'])

• Modify an existing class loader.
  1. Obtain a properties file for the class loader to change.

     We can extract a properties file for a Classloader object using the extractConfigProperties command.

  2. Open the properties file in an editor and change the properties as needed.

  3. Run the applyConfigProperties command.

• If you no longer need a class loader, we can delete the entire class loader object.

  To delete the entire object, specify DELETE=true in the header section of the properties file and run the deleteConfigProperties command; for example:

  AdminTask.deleteConfigProperties('[-propertiesFileName myObjectType.props -reportFileName report.txt]')

Results

We can use the properties file to manage the class loader object.

Save the changes to your configuration.

Related concepts:

Class loaders

Related

Extracting properties files using wsadmin.sh
Create server, cluster, application, or authorization group objects using properties files and wsadmin scripting
Delete server, cluster, application, or authorization group objects using properties files

Reference:

PropertiesBasedConfiguration command group for AdminTask using wsadmin.sh

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