BEA WebLogic User Manual page 201

Part VIII Appendixes
DeliveryContextRuntimeException
Thrown when an unexpected condition causes DeliveryContext creation or method to fail. The
exception message describes the problem, such as "invalid ServletRequest Object".
InvalidAttributeTypeException
Thrown when a type-specific method is called on an attribute of the wrong type. For example,
using getBooleanAttribute() to obtain a String value.
NoSuchAttributeException
Thrown when an attribute name is requested and that attribute does not exist. This is different
from the attribute existing and not having a value defined for the requesting device.
AttributeValueUndefinedException
Thrown when an attribute name is requested but the attribute value does not exist.
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