[BeanUtils2] Performance improvement: store hash code of 
AccessibleObjectDescriptor as member variable
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                 Key: SANDBOX-401
                 URL: https://issues.apache.org/jira/browse/SANDBOX-401
             Project: Commons Sandbox
          Issue Type: Improvement
          Components: BeanUtils2
    Affects Versions: Nightly Builds
            Reporter: Benedikt Ritter


As discussed on the ML, we should store the hash code of 
AccessibleObjectDescriptor in a private member variable after it has been 
computed the first time. The computed value can be returned on subsequent 
invocations. Since AccessibleObjectDescriptor is immutable (all of its fields 
are final) the hash code can never change, once an AccessibleObjectDescriptor 
has been initialized.

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