Modify class loader modes for applications using wsadmin.sh

We can modify class loader modes for an application with scripting and the wsadmin tool.

There are two ways to complete this task. The example in this topic uses the AdminConfig object to create and configure a shared library. Alternatively, we can use the createSharedLibrary script in the AdminResources script library to configure shared libraries.

The scripting library provides a set of procedures to automate the most common administration functions. We can run each script procedure individually, or combine several procedures to quickly develop new scripts.

If an application is running, changing an application setting causes the application to restart. On stand-alone servers, the application restarts after we save the change. On multiple-server products, the application restarts after we save the change and files synchronize on the node where the application is installed. To control when synchronization occurs on multiple-server products, deselect Synchronize changes with nodes on the Console preferences page.

Tasks

1. Start the wsadmin scripting tool.

2. Retrieve the configuration ID of the object to modify and set it to the dep variable. For example:
   • Jacl:

     set dep [$AdminConfig getid /Deployment:ivtApp/]
     

   • Jython:

     dep = AdminConfig.getid('/Deployment:ivtApp/')
     

3. Identify the deployed object and set it to the depObject variable. For example:
   • Jacl:

     set depObject [$AdminConfig showAttribute $dep deployedObject]
     

   • Jython:

     depObject = AdminConfig.showAttribute(dep, 'deployedObject')
     

4. Identify the class loader and set it to the classldr variable. For example:
   • Jacl:

     set classldr [$AdminConfig showAttribute $depObject classloader]
     

   • Jython:

     classldr = AdminConfig.showAttribute(depObject, 'classloader')
     

5. Show the current attribute values of the configuration object with the showall command, for example:
   • Jacl:

     $AdminConfig showall $classldr
     

     Example output:

     {libraries {}} {mode PARENT_FIRST}
     

   • Jython:

     print AdminConfig.showall(classldr)
     

     Example output:

     [libraries []] [mode PARENT_FIRST]
     

6. Modify the attributes of the configuration object with the modify command, for example:
   • Jacl:

     $AdminConfig modify $classldr {{mode PARENT_LAST}}
     

   • Jython:

     AdminConfig.modify(classldr, [['mode', 'PARENT_LAST']])
     

7. Save the configuration changes.

   AdminConfig.save()
   

8. Verify the changes that made to the attribute value with the showall command, for example:
   • Jacl:

     $AdminConfig showall $classldr
     

     Example output:

     {libraries {}} {mode PARENT_LAST}
     

   • Jython:

     AdminConfig.showall(classldr)
     

     Example output:

     [libraries []] [mode PARENT_LAST]
     

Start the wsadmin scripting client

wsadmin AdminConfig

Commands for the AdminConfig object