OpenJPA provides an interface for a provider to implement
	connection password encryption. Whenever a connection password
	is needed, the decrypt(String) method will be invoked. See
	
	org.apache.openjpa.lib.encryption.EncryptionProvider
	 for the detailed Javadoc.
    
Notes:
                It is an OpenJPA user responsibility to implement the
                EncryptionProvider
                interface. There is no default implementation.
            
                The interface has an encrypt(String) method,
                but it is not called by the OpenJPA runtime.