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 the class loader configuration or its configuration objects.

From the server profile bin directory, run wsadmin -lang jython

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.

for PARENT_LAST class loader properties files. We can

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 we 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 configure and manage the class loader object.

What to do next

Save the changes to the configuration.

Related concepts

Class loaders

Related tasks

Extracting properties files

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

PropertiesBasedConfiguration (AdminTask)