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Pages directly interact with stateful Java components on the server. Components and their state are managed by the Wicket framework, freeing the application developer from having to use HttpSession directly to manage state. Does not require XML for configuration. Compared to JSPs, enforces a clear separation of HTML markup and Java code.
This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.
Composability is a system design principle that deals with the inter-relationships of components. A highly composable system provides components that can be selected and assembled in various combinations to satisfy specific user requirements. In information systems, the essential features that make a component composable are that it be:
This is the data that relates to the actual business process, run by the current service activity e.g. customer records, etc. on some occasions this type of data may need to be temporarily stored, especially if it acts as an input to the next stage within the service activity.
In Java, any method can call System.exit(int status), unless a security manager does not permit it.This will terminate the currently running Java Virtual Machine. "The argument serves as a status code; by convention, a nonzero status code indicates abnormal termination."
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The stateless nature of HTTP makes locking infeasible for web user interfaces. It is common for a user to start editing a record, then leave without following a "cancel" or "logout" link. If locking is used, other users who attempt to edit the same record must wait until the first user's lock times out.