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J2EE Interview Questions and Answers
What is queue ?
A messaging system built on the concept of message queues. Each message
is addressed to a specific queue; clients extract messages from the
queues established to hold their messages.
What is RAR ?
Resource Adapter Archive. A JAR archive that contains a resource adapter
module.
What is RDF ?
Resource Description Framework. A standard for defining the kind of data
that an XML file contains. Such information can help ensure semantic
integrity-for example-by helping to make sure that a date is treated as
a date rather than simply as text.
What is RDF schema ?
A standard for specifying consistency rules that apply to the
specifications contained in an RDF.
What is realm ?
See security policy domain. Also, a string, passed as part of an HTTP
request during basic authentication, that defines a protection space.
The protected resources on a server can be partitioned into a set of
protection spaces, each with its own authentication scheme or
authorization database or both. In the J2EE server authentication
service, a realm is a complete database of roles, users, and groups that
identify valid users of a Web application or a set of Web applications.
What is reentrant entity bean ?
An entity bean that can handle multiple simultaneous, interleaved, or
nested invocations that will not interfere with each other.
What is reference ?
A reference to an entity that is substituted for the reference when the
XML document is parsed. It can reference a predefined entity such as <
or reference one that is defined in the DTD. In the XML data, the
reference could be to an entity that is defined in the local subset of
the DTD or to an external XML file (an external entity). The DTD can
also carve out a segment of DTD specifications and give it a name so
that it can be reused (included) at multiple points in the DTD by
defining a parameter entity.
What is registry ?
An infrastructure that enables the building, deployment, and discovery
of Web services. It is a neutral third party that facilitates dynamic
and loosely coupled business-to-business (B2B) interactions.
What is registry provider ?
An implementation of a business registry that conforms to a
specification for XML registries (for example, ebXML or UDDI).
What is relationship field ?
A virtual field of an entity bean having container-managed persistence;
it identifies a related entity bean.
What is remote interface ?
One of two interfaces for an enterprise bean. The remote interface
defines the business methods callable by a client.
What is remove method ?
Method defined in the Home interface and invoked by a client to destroy
an enterprise bean.
What is render kit ?
A set of renderers that render output to a particular client. The
JavaServer Faces implementation provides a standard HTML render kit,
which is composed of renderers that can render HMTL markup.
What is renderer ?
A Java class that can render the output for a set of JavaServer Faces UI
components.
What is resource adapter ?
A system-level software driver that is used by an EJB container or an
application client to connect to an enterprise information system. A
resource adapter typically is specific to an enterprise information
system. It is available as a library and is used within the address
space of the server or client using it. A resource adapter plugs in to a
container. The application components deployed on the container then use
the client API (exposed by the adapter) or tool-generated high-level
abstractions to access the underlying enterprise information system. The
resource adapter and EJB container collaborate to provide the underlying
mechanisms-transactions, security, and connection pooling-for
connectivity to the enterprise information system.
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