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J2EE Interview Questions and Answers
What is servlet context ?
An object that contains a servlet's view of the Web application within
which the servlet is running. Using the context, a servlet can log
events, obtain URL references to resources, and set and store attributes
that other servlets in the context can use.
What is servlet mapping ?
Defines an association between a URL pattern and a servlet. The mapping
is used to map requests to servlets.
What is session ?
An object used by a servlet to track a user's interaction with a Web
application across multiple HTTP requests.
What is session bean ?
An enterprise bean that is created by a client and that usually exists
only for the duration of a single client-server session. A session bean performs
operations, such as calculations or database access, for the client. Although a
session bean can be transactional, it is not recoverable should a system crash
occur. Session bean objects either can be stateless or can maintain
conversational state across methods and transactions. If a session bean
maintains state, then the EJB container manages this state if the object must be
removed from memory. However, the session bean object itself must manage its own persistent data.
What is SGML ?
Standard Generalized Markup Language. The parent of both HTML and XML.
Although HTML shares SGML's propensity for embedding presentation
information in the markup, XML is a standard that allows information
content to be totally separated from the mechanisms for rendering that
content.
What is SOAP ?
Simple Object Access Protocol. A lightweight protocol intended for
exchanging structured information in a decentralized, distributed
environment. It defines, using XML technologies, an extensible messaging
framework containing a message construct that can be exchanged over a
variety of underlying protocols.
What is SOAP with Attachments API for Java (SAAJ) ?
The basic package for SOAP messaging, SAAJ contains the API for creating
and populating a SOAP message.
What is SQL ?
Structured Query Language. The standardized relational database language
for defining database objects and manipulating data.
What is SQL/J ?
A set of standards that includes specifications for embedding SQL
statements in methods in the Java programming language and
specifications for calling Java static methods as SQL stored procedures
and user-defined functions. An SQL checker can detect errors in static
SQL statements at program development time, rather than at execution
time as with a JDBC driver.
What is SSL ?
Secure Socket Layer. A security protocol that provides privacy over the
Internet. The protocol allows client-server applications to communicate
in a way that cannot be eavesdropped upon or tampered with. Servers are
always authenticated, and clients are optionally authenticated.
What is stateful session bean ?
A session bean with a conversational state.
What is stateless session bean ?
A session bean with no conversational state. All instances of a
stateless session bean are identical.
What is system administrator ?
The person responsible for configuring and administering the
enterprise's computers, networks, and software systems.
What is tag ?
In XML documents, a piece of text that describes a unit of data or an
element. The tag is distinguishable as markup, as opposed to data,
because it is surrounded by angle brackets (< and >). To treat such
markup syntax as data, you use an entity reference or a CDATA section.
What is template ?
A set of formatting instructions that apply to the nodes selected by an
XPath expression.
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