J2EE Interview questions and answers

41. What is commit 

The point in a transaction when all updates to any
resources involved in the transaction are made
permanent. 

42. What is component contract 

The contract between a J2EE component and its
container. The contract includes life-cycle management
of the component, a context interface that the
instance uses to obtain various information and
services from its container, and a list of services
that every container must provide for its components.


43. What is component-managed sign-on 

A mechanism whereby security information needed for
signing on to a resource is provided by an application
component. 

44. What is connector 

A standard extension mechanism for containers that
provides connectivity to enterprise information
systems. A connector is specific to an enterprise
information system and consists of a resource adapter
and application development tools for enterprise
information system connectivity. The resource adapter
is plugged in to a container through its support for
system-level contracts defined in the Connector
architecture. 


45. What is Connector architecture 

An architecture for integration of J2EE products with
enterprise information systems. There are two parts to
this architecture: a resource adapter provided by an
enterprise information system vendor and the J2EE
product that allows this resource adapter to plug in.
This architecture defines a set of contracts that a
resource adapter must support to plug in to a J2EE
product-for example, transactions, security, and
resource management. 

46. What is container 

An entity that provides life-cycle management,
security, deployment, and runtime services to J2EE
components. Each type of container (EJB, Web, JSP,
servlet, applet, and application client) also provides
component-specific services. 


47. What is container-managed persistence 

The mechanism whereby data transfer between an entity
bean's variables and a resource manager is managed by
the entity bean's container. 

48. What is container-managed sign-on 

The mechanism whereby security information needed for
signing on to a resource is supplied by the container.

49. What is container-managed transaction 

A transaction whose boundaries are defined by an EJB
container. An entity bean must use container-managed
transactions. 

50. What is content 

In an XML document, the part that occurs after the
prolog, including the root element and everything it
contains.