Sunday, 3 July 2011
ASP.net FAQ
Java Websphere Interview questions
Java Websphere Interview questions
1. What is JACL
2. DB2 Connection from WebSphere
3. When using the WebSphere, Which three updates would force you to restart the test environment?
4. Whats the difference between WAS5.x and WAS6.x.
5. how to deploy web/jar files in Weblogic or tomcat in unix/Linux environment ?
6. What is the difference between Web Server and Application Server ?
7. What is Deployment Descriptors? How many types of Deployment Descriptors are available? What are they?
8. What is a server?
9. what is the differences between web sphere 4.0,5.0 and 6.0.
10. In IBM WSAD, server crashes sometime while running in debug mode .Is there any way to prevent it ??
11. How to implement JDBC-ODBC bridge driver (Type 1) in Websphere'??
12. Is there any difference between Weblogic and Websphere application servers
13. how to import jaxp package in ibm wsad5.1
14. how to choose websphere other than any application server
15. how many ways deployments in ibm websphere.please give me one examples
16. what are the different appication servers and webservers supporting JAVA,.NET and VC++ Technologies
17. What is the use of weblogic and web sphere.
1. What is JACL
2. DB2 Connection from WebSphere
3. When using the WebSphere, Which three updates would force you to restart the test environment?
4. Whats the difference between WAS5.x and WAS6.x.
5. how to deploy web/jar files in Weblogic or tomcat in unix/Linux environment ?
6. What is the difference between Web Server and Application Server ?
7. What is Deployment Descriptors? How many types of Deployment Descriptors are available? What are they?
8. What is a server?
9. what is the differences between web sphere 4.0,5.0 and 6.0.
10. In IBM WSAD, server crashes sometime while running in debug mode .Is there any way to prevent it ??
11. How to implement JDBC-ODBC bridge driver (Type 1) in Websphere'??
12. Is there any difference between Weblogic and Websphere application servers
13. how to import jaxp package in ibm wsad5.1
14. how to choose websphere other than any application server
15. how many ways deployments in ibm websphere.please give me one examples
16. what are the different appication servers and webservers supporting JAVA,.NET and VC++ Technologies
17. What is the use of weblogic and web sphere.
__________________
Springs Java FAQ
Spring Interview Questions
1) Explain about spring applications framework?
Spring architecture helps you to manage your business objects. Implementation part of the spring is easy because it helps you to introduce it in the middle of the objects. This framework is easy to implement in testing conditions. This is used by many large vendors.
2) State some benefits and advantages of spring framework?
Some of the benefits which spring can offer you are as follows: -
• It is very beneficial for middle tier applications and it can be used in various run time environments.
• Various custom properties need not be used in applications.
• Cost can be reduced by reducing the programming to interface cost ratio.
• Applications built on spring framework are easy to test.
3) Explain about portability of spring?
Spring applications and framework are portable between different servers. This framework and applications are portable between many different servers such as Tomcat, Jetty, Web Logic, Web Sphere, Resin, Geronimo, etc. Environment features can be implemented without affecting portability.
4) Explain about Bean factory?
Spring is designed to work with Java Beans and this forms the core part of the Spring Framework. This is a generic factory and it lets users and developers to enable objects by name. This helps to manage relationships between objects.
5) Explain about the two models of the object which Bean Factory supports?
Two models of object which bean factory supports are: -
1) Single ton and prototype.
Singleton has one instance (shared) with an object and it is assigned a specific name which can be retrieved on lookup.
Prototype results in creation of an independent object.
6) Explain about Bean definition Reader interface?
Bean definition reader interface separates Bean factory implementations from metadata format. This is very useful if the application needs different metadata implementations. This framework or interface can be implemented in different ways.
7) State about the commonly used Bean Factory definitions?
The most commonly used bean factory definitions are as follows: -
1) XML bean factory and 2) DefaultListable beanfactory.
XMLbean factory is used to parse XML structure to define classes and properties of objects (named).
DefaultListablebeanfactory is useful to program bean factories and parse definitions.
8) Explain about inversion control behavior?
Inversion control behavior is obtained through bean factory concept. The best part about this container is it can be coded in a single line and has simple deployment steps. Inversion of control behavior is very useful to avoid heavy containers such as EJB.
9) Explain about dependency injection?
Dependency injection is used to remove dependence of explicit coding on container. It resembles to a form of IoC. Java methods are chiefly used to inject dependencies into an object. It is used to collaborate and configure values into an object.
10) Explain why an organization needs to implement spring framework?
Spring framework is essential because it touches important aspects such as
1) It is very useful to manage business objects
2) Spring architecture is very flexible it regains its architecture even when you can take some parts of it.
3) Testing part is very efficient and east to use.
4) Vendors recognized its importance and they are using it for enterprise Java development.
11) Explain about how to deploy applications using POJOs?
Spring helps you to develop components using POJOs. Spring Framework takes care of your need to build enterprise applications. Infrastructure of your application should be away from the business logic because it can improve the pace of your business logic changes. This is provided by Springs Framework.
12) Explain about auto wire support?
When auto wire is used as an optional attribute it reduces the volume of configuration. Auto wire should be used on the root element and this is used to activate auto wiring for all beans. If you would like to add an additional constructor it can be populates without the need to change configuration.
13) Explain the three different methods which are provided by the Namespace Handler interface?
The three different methods which are provided by the name space handler interface are: -
1) Init() is used to allow initialization for name space handler.
2) BeanDefinition parse is used when a Spring encounters a top level element.
3) BeanDefinitionHandler is used when spring encounters an attribute.
14) Explain about the different ways in which Spring JDBC can help you?
There are several ways in which a spring JDBC can help you they are: -
1) Connection leaks can be avoided.
2) Code can be focused on necessary SQL and it is very low.
3) Applications will never have to depend on RDBMS error specification handling.
4) You can easily implement DAO pattern without business logic.
15) Explain about exception wrapping?
Wrapping can be effectively done using spring. It makes the proprietary code to run in the ORM layer to a set of abstracted run time exceptions. Persistence exceptions can be easily handled. Handling of exceptions can be done very easily.
16) Explain about transaction management in spring?
Spring uses its own abstract for transaction management. It uses to deliver
1) Programmatic transaction management through SimpleJdbcTemplate.
2) Declarative transaction management is similar to EJB. It is compatible with superset of EJB CMT with some unique features.
17) Explain about integration of spring with AspectJ?
Spring integrates comfortably with AspectJ and this aspect makes it very poular. It makes it possible to include AspectJ aspects into Spring applications. Using Spring IoC container it is possible for dependency inject AspectJ. AspectJ is also used to inject non spring managed POJO using spring. It is uses XML and annotation driven pointcuts.
1) Explain about spring applications framework?
Spring architecture helps you to manage your business objects. Implementation part of the spring is easy because it helps you to introduce it in the middle of the objects. This framework is easy to implement in testing conditions. This is used by many large vendors.
2) State some benefits and advantages of spring framework?
Some of the benefits which spring can offer you are as follows: -
• It is very beneficial for middle tier applications and it can be used in various run time environments.
• Various custom properties need not be used in applications.
• Cost can be reduced by reducing the programming to interface cost ratio.
• Applications built on spring framework are easy to test.
3) Explain about portability of spring?
Spring applications and framework are portable between different servers. This framework and applications are portable between many different servers such as Tomcat, Jetty, Web Logic, Web Sphere, Resin, Geronimo, etc. Environment features can be implemented without affecting portability.
4) Explain about Bean factory?
Spring is designed to work with Java Beans and this forms the core part of the Spring Framework. This is a generic factory and it lets users and developers to enable objects by name. This helps to manage relationships between objects.
5) Explain about the two models of the object which Bean Factory supports?
Two models of object which bean factory supports are: -
1) Single ton and prototype.
Singleton has one instance (shared) with an object and it is assigned a specific name which can be retrieved on lookup.
Prototype results in creation of an independent object.
6) Explain about Bean definition Reader interface?
Bean definition reader interface separates Bean factory implementations from metadata format. This is very useful if the application needs different metadata implementations. This framework or interface can be implemented in different ways.
7) State about the commonly used Bean Factory definitions?
The most commonly used bean factory definitions are as follows: -
1) XML bean factory and 2) DefaultListable beanfactory.
XMLbean factory is used to parse XML structure to define classes and properties of objects (named).
DefaultListablebeanfactory is useful to program bean factories and parse definitions.
8) Explain about inversion control behavior?
Inversion control behavior is obtained through bean factory concept. The best part about this container is it can be coded in a single line and has simple deployment steps. Inversion of control behavior is very useful to avoid heavy containers such as EJB.
9) Explain about dependency injection?
Dependency injection is used to remove dependence of explicit coding on container. It resembles to a form of IoC. Java methods are chiefly used to inject dependencies into an object. It is used to collaborate and configure values into an object.
10) Explain why an organization needs to implement spring framework?
Spring framework is essential because it touches important aspects such as
1) It is very useful to manage business objects
2) Spring architecture is very flexible it regains its architecture even when you can take some parts of it.
3) Testing part is very efficient and east to use.
4) Vendors recognized its importance and they are using it for enterprise Java development.
11) Explain about how to deploy applications using POJOs?
Spring helps you to develop components using POJOs. Spring Framework takes care of your need to build enterprise applications. Infrastructure of your application should be away from the business logic because it can improve the pace of your business logic changes. This is provided by Springs Framework.
12) Explain about auto wire support?
When auto wire is used as an optional attribute it reduces the volume of configuration. Auto wire should be used on the root element and this is used to activate auto wiring for all beans. If you would like to add an additional constructor it can be populates without the need to change configuration.
13) Explain the three different methods which are provided by the Namespace Handler interface?
The three different methods which are provided by the name space handler interface are: -
1) Init() is used to allow initialization for name space handler.
2) BeanDefinition parse is used when a Spring encounters a top level element.
3) BeanDefinitionHandler is used when spring encounters an attribute.
14) Explain about the different ways in which Spring JDBC can help you?
There are several ways in which a spring JDBC can help you they are: -
1) Connection leaks can be avoided.
2) Code can be focused on necessary SQL and it is very low.
3) Applications will never have to depend on RDBMS error specification handling.
4) You can easily implement DAO pattern without business logic.
15) Explain about exception wrapping?
Wrapping can be effectively done using spring. It makes the proprietary code to run in the ORM layer to a set of abstracted run time exceptions. Persistence exceptions can be easily handled. Handling of exceptions can be done very easily.
16) Explain about transaction management in spring?
Spring uses its own abstract for transaction management. It uses to deliver
1) Programmatic transaction management through SimpleJdbcTemplate.
2) Declarative transaction management is similar to EJB. It is compatible with superset of EJB CMT with some unique features.
17) Explain about integration of spring with AspectJ?
Spring integrates comfortably with AspectJ and this aspect makes it very poular. It makes it possible to include AspectJ aspects into Spring applications. Using Spring IoC container it is possible for dependency inject AspectJ. AspectJ is also used to inject non spring managed POJO using spring. It is uses XML and annotation driven pointcuts.
Java Struts FAQ
- struts comes under which layer of three tire architecture in real time projects plz i need explaination?
- Difference between struts1.2 and struts2.0?
- is it possible to see actionservlet in my system. if yes how
- what is the difference between page and pageContext implicit variables
- Where can i get jar file for use the struts-tags in struts2?
- How can I make own ActionServlet? with example
- How do you customize ActionServlet?
- while working struts in intellij 7.0error unable to initialize tld location cache: zip file is closed is displayed anybdy can answer me immdialy .ungert
- In web.xml file instead of *.do can i write *.ibm, Specify with example
- If we close the browser,when the specific user session is active.Again if we open browse how to retrive it same user??what code i have to da???
- multiple instances for action class is it possible
- what is the difference between ServletContext and ServletConfig?
- Is Struts Action class Thread Safe?
- Which parser is used in Struts to parse the Structconfig.xml file.
- life cycle of struts?
- Is it possible to create mulitple instance of one Action Class in struts?
- can anyone help me to send the code for Jasper Reporting in java?plz
- How to explain Software Bank Loan descriptions
- why do we typecast ActionForm into our plain java bean class in Action class? What is the reason?
__________________
JSP FAQ
Q: What is a output comment?
A: A comment that is sent to the client in the viewable page source.The JSP engine handles an output comment as uninterpreted HTML text, returning the comment in the HTML output sent to the client. You can see the comment by viewing the page source from your Web browser.
JSP Syntax
<!-- comment [ <%= expression %> ] -->
Example 1
<!-- This is a commnet sent to client on
<%= (new java.util.Date()).toLocaleString() %>
-->
Displays in the page source:
<!-- This is a commnet sent to client on January 24, 2004 -->
Q: What is a Hidden Comment?
A: A comments that documents the JSP page but is not sent to the client. The JSP engine ignores a hidden comment, and does not process any code within hidden comment tags. A hidden comment is not sent to the client, either in the displayed JSP page or the HTML page source. The hidden comment is useful when you want to hide or "comment out" part of your JSP page.
You can use any characters in the body of the comment except the closing --%> combination. If you need to use --%> in your comment, you can escape it by typing --%\>.
JSP Syntax
<%-- comment --%>
Examples
<%@ page language="java" %>
<html>
<head><title>A Hidden Comment </title></head>
<body>
<%-- This comment will not be visible to the colent in the page source --%>
</body>
</html>
Q: What is a Expression?
A: An expression tag contains a scripting language expression that is evaluated, converted to a String, and inserted where the expression appears in the JSP file. Because the value of an expression is converted to a String, you can use an expression within text in a JSP file. Like
<%= someexpression %>
<%= (new java.util.Date()).toLocaleString() %>
You cannot use a semicolon to end an expression
Q: What is a Declaration?
A: A declaration declares one or more variables or methods for use later in the JSP source file.
A declaration must contain at least one complete declarative statement. You can declare any number of variables or methods within one declaration tag, as long as they are separated by semicolons. The declaration must be valid in the scripting language used in the JSP file.
<%! somedeclarations %>
<%! int i = 0; %>
<%! int a, b, c; %>
Q: What is a Scriptlet?
A: A scriptlet can contain any number of language statements, variable or method declarations, or expressions that are valid in the page scripting language.Within scriptlet tags, you can
1.Declare variables or methods to use later in the file (see also Declaration).
2.Write expressions valid in the page scripting language (see also Expression).
3.Use any of the JSP implicit objects or any object declared with a <jsp:useBean> tag.
You must write plain text, HTML-encoded text, or other JSP tags outside the scriptlet.
Scriptlets are executed at request time, when the JSP engine processes the client request. If the scriptlet produces output, the output is stored in the out object, from which you can display it.
Q: What are implicit objects? List them?
A: Certain objects that are available for the use in JSP documents without being declared first. These objects are parsed by the JSP engine and inserted into the generated servlet. The implicit objects re listed below
request
response
pageContext
session
application
out
config
page
exception
Q: Difference between forward and sendRedirect?
A: When you invoke a forward request, the request is sent to another resource on the server, without the client being informed that a different resource is going to process the request. This process occurs completly with in the web container. When a sendRedirtect method is invoked, it causes the web container to return to the browser indicating that a new URL should be requested. Because the browser issues a completly new request any object that are stored as request attributes before the redirect occurs will be lost. This extra round trip a redirect is slower than forward.
Q: What are the different scope valiues for the <jsp:useBean>?
A: The different scope values for <jsp:useBean> are
1. page
2. request
3.session
4.application
Q: Explain the life-cycle mehtods in JSP?
A: THe generated servlet class for a JSP page implements the HttpJspPage interface of the javax.servlet.jsp package. Hte HttpJspPage interface extends the JspPage interface which inturn extends the Servlet interface of the javax.servlet package. the generated servlet class thus implements all the methods of the these three interfaces. The JspPage interface declares only two mehtods - jspInit() and jspDestroy() that must be implemented by all JSP pages regardless of the client-server protocol. However the JSP specification has provided the HttpJspPage interfaec specifically for the JSp pages serving HTTP requests. This interface declares one method _jspService().
The jspInit()- The container calls the jspInit() to initialize te servlet instance.It is called before any other method, and is called only once for a servlet instance.
The _jspservice()- The container calls the _jspservice() for each request, passing it the request and the response objects.
The jspDestroy()- The container calls this when it decides take the instance out of service. It is the last method called n the servlet instance.
Q: How do I prevent the output of my JSP or Servlet pages from being cached by the browser?
A: You will need to set the appropriate HTTP header attributes to prevent the dynamic content output by the JSP page from being cached by the browser. Just execute the following scriptlet at the beginning of your JSP pages to prevent them from being cached at the browser. You need both the statements to take care of some of the older browser versions.
<%
response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma\","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>
Q: How does JSP handle run-time exceptions?
A: You can use the errorPage attribute of the page directive to have uncaught run-time exceptions automatically forwarded to an error processing page. For example:
<%@ page errorPage=\"error.jsp\" %> redirects the browser to the JSP page error.jsp if an uncaught exception is encountered during request processing. Within error.jsp, if you indicate that it is an error-processing page, via the directive: <%@ page isErrorPage=\"true\" %> Throwable object describing the exception may be accessed within the error page via the exception implicit object. Note: You must always use a relative URL as the value for the errorPage attribute.
Q: How can I implement a thread-safe JSP page? What are the advantages and Disadvantages of using it?
A: You can make your JSPs thread-safe by having them implement the SingleThreadModel interface. This is done by adding the directive <%@ page isThreadSafe="false" %> within your JSP page. With this, instead of a single instance of the servlet generated for your JSP page loaded in memory, you will have N instances of the servlet loaded and initialized, with the service method of each instance effectively synchronized. You can typically control the number of instances (N) that are instantiated for all servlets implementing SingleThreadModel through the admin screen for your JSP engine. More importantly, avoid using the tag for variables. If you do use this tag, then you should set isThreadSafe to true, as mentioned above. Otherwise, all requests to that page will access those variables, causing a nasty race condition. SingleThreadModel is not recommended for normal use. There are many pitfalls, including the example above of not being able to use <%! %>. You should try really hard to make them thread-safe the old fashioned way: by making them thread-safe .
A: A comment that is sent to the client in the viewable page source.The JSP engine handles an output comment as uninterpreted HTML text, returning the comment in the HTML output sent to the client. You can see the comment by viewing the page source from your Web browser.
JSP Syntax
<!-- comment [ <%= expression %> ] -->
Example 1
<!-- This is a commnet sent to client on
<%= (new java.util.Date()).toLocaleString() %>
-->
Displays in the page source:
<!-- This is a commnet sent to client on January 24, 2004 -->
Q: What is a Hidden Comment?
A: A comments that documents the JSP page but is not sent to the client. The JSP engine ignores a hidden comment, and does not process any code within hidden comment tags. A hidden comment is not sent to the client, either in the displayed JSP page or the HTML page source. The hidden comment is useful when you want to hide or "comment out" part of your JSP page.
You can use any characters in the body of the comment except the closing --%> combination. If you need to use --%> in your comment, you can escape it by typing --%\>.
JSP Syntax
<%-- comment --%>
Examples
<%@ page language="java" %>
<html>
<head><title>A Hidden Comment </title></head>
<body>
<%-- This comment will not be visible to the colent in the page source --%>
</body>
</html>
Q: What is a Expression?
A: An expression tag contains a scripting language expression that is evaluated, converted to a String, and inserted where the expression appears in the JSP file. Because the value of an expression is converted to a String, you can use an expression within text in a JSP file. Like
<%= someexpression %>
<%= (new java.util.Date()).toLocaleString() %>
You cannot use a semicolon to end an expression
Q: What is a Declaration?
A: A declaration declares one or more variables or methods for use later in the JSP source file.
A declaration must contain at least one complete declarative statement. You can declare any number of variables or methods within one declaration tag, as long as they are separated by semicolons. The declaration must be valid in the scripting language used in the JSP file.
<%! somedeclarations %>
<%! int i = 0; %>
<%! int a, b, c; %>
Q: What is a Scriptlet?
A: A scriptlet can contain any number of language statements, variable or method declarations, or expressions that are valid in the page scripting language.Within scriptlet tags, you can
1.Declare variables or methods to use later in the file (see also Declaration).
2.Write expressions valid in the page scripting language (see also Expression).
3.Use any of the JSP implicit objects or any object declared with a <jsp:useBean> tag.
You must write plain text, HTML-encoded text, or other JSP tags outside the scriptlet.
Scriptlets are executed at request time, when the JSP engine processes the client request. If the scriptlet produces output, the output is stored in the out object, from which you can display it.
Q: What are implicit objects? List them?
A: Certain objects that are available for the use in JSP documents without being declared first. These objects are parsed by the JSP engine and inserted into the generated servlet. The implicit objects re listed below
request
response
pageContext
session
application
out
config
page
exception
Q: Difference between forward and sendRedirect?
A: When you invoke a forward request, the request is sent to another resource on the server, without the client being informed that a different resource is going to process the request. This process occurs completly with in the web container. When a sendRedirtect method is invoked, it causes the web container to return to the browser indicating that a new URL should be requested. Because the browser issues a completly new request any object that are stored as request attributes before the redirect occurs will be lost. This extra round trip a redirect is slower than forward.
Q: What are the different scope valiues for the <jsp:useBean>?
A: The different scope values for <jsp:useBean> are
1. page
2. request
3.session
4.application
Q: Explain the life-cycle mehtods in JSP?
A: THe generated servlet class for a JSP page implements the HttpJspPage interface of the javax.servlet.jsp package. Hte HttpJspPage interface extends the JspPage interface which inturn extends the Servlet interface of the javax.servlet package. the generated servlet class thus implements all the methods of the these three interfaces. The JspPage interface declares only two mehtods - jspInit() and jspDestroy() that must be implemented by all JSP pages regardless of the client-server protocol. However the JSP specification has provided the HttpJspPage interfaec specifically for the JSp pages serving HTTP requests. This interface declares one method _jspService().
The jspInit()- The container calls the jspInit() to initialize te servlet instance.It is called before any other method, and is called only once for a servlet instance.
The _jspservice()- The container calls the _jspservice() for each request, passing it the request and the response objects.
The jspDestroy()- The container calls this when it decides take the instance out of service. It is the last method called n the servlet instance.
Q: How do I prevent the output of my JSP or Servlet pages from being cached by the browser?
A: You will need to set the appropriate HTTP header attributes to prevent the dynamic content output by the JSP page from being cached by the browser. Just execute the following scriptlet at the beginning of your JSP pages to prevent them from being cached at the browser. You need both the statements to take care of some of the older browser versions.
<%
response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma\","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
%>
Q: How does JSP handle run-time exceptions?
A: You can use the errorPage attribute of the page directive to have uncaught run-time exceptions automatically forwarded to an error processing page. For example:
<%@ page errorPage=\"error.jsp\" %> redirects the browser to the JSP page error.jsp if an uncaught exception is encountered during request processing. Within error.jsp, if you indicate that it is an error-processing page, via the directive: <%@ page isErrorPage=\"true\" %> Throwable object describing the exception may be accessed within the error page via the exception implicit object. Note: You must always use a relative URL as the value for the errorPage attribute.
Q: How can I implement a thread-safe JSP page? What are the advantages and Disadvantages of using it?
A: You can make your JSPs thread-safe by having them implement the SingleThreadModel interface. This is done by adding the directive <%@ page isThreadSafe="false" %> within your JSP page. With this, instead of a single instance of the servlet generated for your JSP page loaded in memory, you will have N instances of the servlet loaded and initialized, with the service method of each instance effectively synchronized. You can typically control the number of instances (N) that are instantiated for all servlets implementing SingleThreadModel through the admin screen for your JSP engine. More importantly, avoid using the tag for variables. If you do use this tag, then you should set isThreadSafe to true, as mentioned above. Otherwise, all requests to that page will access those variables, causing a nasty race condition. SingleThreadModel is not recommended for normal use. There are many pitfalls, including the example above of not being able to use <%! %>. You should try really hard to make them thread-safe the old fashioned way: by making them thread-safe .
Advanced Java
Core Java
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