Displaying Shared Classes 

Use

Shared classes are Java classes loaded into the shared memory by shared class loaders. They can then be used by all VMs belonging to the same instance. You can display shared classes in the VMC system administration, but you cannot change them in any way.

Procedure

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       1.      On the initial screen of the VMC system administration (SM53) in the structure on the left side under Navigation double-click on Shared Classes.

In the area on the right you will see the hierarchical structure of the existing shared class loaders.

       2.      Select a node and choose  Map loaded Classes to get to the relevant detail table.

The detail table for each of the shared class loaders indicates among other things whether each loaded class has been correctly initialized and attached in compliance with the VM and shared memory. For each class you can also see the number of “placeholders” for static fields and instance fields.

 

Shared classes are not the same as shared objects. In the VM Container most classes are shared, but each VM usually has its own instances of these classes. Only the byte code class is shared by all VMs since it was loaded from the instance of a shared class loader. To create shared objects you have to copy the instance of a class into a shared closure.