Hibernate Components

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*To use hibernate provided database connections the configuration requires the following properties

1. Connection driver class
2. Connection url
3. Connection user name
4. Connection pwd
5. dialect

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Jsp

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*Jsp Class Hierarchy

*Jsp Life Cycle

Jsp page transalation => Jsp page compilation => loading => instantiation => call jspInit() method => call jspService() method => call jspDestroy() method.

*<%@ page          %>  => Directive

<%=                      %>    => Expression

<%!                      %>     => Declaration

<%                       %>      =>Scriplets

*Jsp page consists of => template text, scripting elements(comments, expressions, declarations, directives, scriplets), standard & custom actions, expression language elements.

*Template text, expressions & scriplets are all translated.

*Jsp Implicit Objects.

1. Request
2. Response
3. Out
4. Session
5. Config
6. Application
7. PageContext
8. Context
9. Exception

*Jsp Scopes

1. Request
2. Application
3. Page
4. Session

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Junit

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*Junit is designed around 2 design patterns

1. Command Pattern
2. Composite Pattern

*Test Case sub class contain many of testXXX() methods. setup() & tearDown() methods to initialize & release any common resources.
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Servlet

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* “load-on-startup” tag is called in init() method.

*”filter-mapping” tag =>This will be applied to the particular “servlet-name” tag that we specify. If we want to apply this filter to all the servlets within the context then we have to use “url-pattern” tag instead of “servlet-name” tag.

*javax.Servlet.Servlet contains the following

Servlet, ServletConfig, ServletContext, ServletRequest, ServletResponse, SingleThreadModel, GenericServlet, ServletInputStream, ServletOutputStream, ServletException, UnavailableException. etc.,

*Javax.Servlet.Servlet.Http contains the following

HttpSevletRequest, HttpServletResponse, HttpSession, HttpSessionContext, HttpSessionBindingListener, Cookies, HttpServlet, HttpSessionBindingEvent, HttpUtils. etc.,

*Http 1.0 Methods=>Get, Head, Post

*Http 1.1 Methods=>Get, Head, Post, Put, Options, Trace, Delete, Connect

*Default mime type for put request is =>application/x-www-form-urlencoded

*GenericServlet class is an abstract class.

* Instance pooling & Request Serialization is used for thread safe Servlets

*HttpServlet class extends the GenericServlet & implements Serializable interface

*Servlet Container calls the public Service() method. The public Service() method calls the protected service() method after casting all the arguments to the HttpServletReqeust & HttpServletResponse. The protected Service() method calls one of the doXXX() methods depending upon the http request method.

*HttpServletClass provides the implementations for doTrace() & doOptions() methods.

*getLastModified(HttpServletRequest) implements the conditional get operation.

* 4 approaches to session tracking.

1. Url writing
2. Hidden form fields
3. Cookies
4. sessions using SSL

*SessionListener should be mentioned in DD(deployment descriptor).

*HttpSessionActivateListener =>Used for notification of the session activation & passivation

*HttpSessionBindingListener=>Used to notify object when it’s placed in the session & removed from the session.

*HttpSessionListener =>Used to notify object when the state of the session changes.

*ServletContext is the servlet view of the web application.

*You can use the RequestDispatcher to delegate request/response process to the other resources with the web application.

*RequestDispatcher interface encapsulate a reference to the other web resource at a specified path within the context of the web application.

*Web Authentication types

1. Http digest Authentication
2. Http basic Authentication
3. Http client Authentication
4. From based Authentication

*Calling the Servlet

URL=>HttpServletRequest=>Sent to Appropriate Server=>Maps the request to the specific resource in the application=>server is dynamically loaded in the server space=>server invoked init()=>service()=>destroy()

*Servlet relations in one image.

*Servlet Life(in Sequence)

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Ejb

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* “ejb-ref-name” tag in both ejb-jar.xml and weblogic-xml(server specific) should be same.
*=>

*Home object is a factory which creates remote object for clients.

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Log 4j

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*Log 4j can be comprised of

1. Logger
2. Appender
3. Layout

*Logging levels

1. Debug
2. Info
3. Warn
4. Error
5. Fatal
6. log

*Layouts

1. PatternLayout
2. SimpleLayout
3. DateLayout
4. XMLLayout
5. HTMLLayout

*Appenders

1. ConolseAppender
2. FileAppender
3. JDBCAppender
4. SMTPAppender
5. SocketAppender

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XML

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*XML Schema element content types

1. Element content
2. Simple content
3. Mixed content

*Attributes can’t contain multiple values. Attributes cant be expandable. Attributes can’t describe the structure.

*DTD=Document Type Definition.=>which is used to define the legal elements in the document.

*MetaData =>Data about the data should be stored in attributes. The data itself is stored in element.

*Parsers(ParserFactories) =>Javax.xml.Parsers

1. SaxParserFactory
2. DocumentBuilderFactory
3. TransformerFactory

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2or3or4 Tier

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JDBC

Java 2-Part 6   Index   Java-Part 7
*4 Types of JDBC Drivers.

1. JDBC-ODBC Bridge Driver                      -Type 1
2. Native Api, Partly Java Driver               -Type 2
3. JDBC-Net, Pure Java Driver                    -Type 3
4. Native Protocol, Purge Java Driver      -Type 4

*Type 1

*Type 2

Type 3

Type 4

*java.sql  =>is having only one class remaining all are interfaces.

class= DriverManager

interfaces = Connection, Statement, PreparedStatement, CallableStatement, ResultSet, ResultSetMetaData, DatabaseMetaData.
Java 2-Part 6   Index   Java-Part 7

JDBC Architecture

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