Here another tests on struts  to test your concepts and get you ready for the next job interview

Struts interview questions 2

These are the test which have questions designed to test your concepts as well as practical skills. for eg questions like

You have 3 List objects in Action class attributes  colorList

["Red", "Yellow", "Green"]

codeList ["R", "Y", "G"] statusList ["Failed", "Severe", "Good"]

What will be the output of the following code?

<s:merge var=”myMergedIterator”>      <s:param value=”%{colorList}” />

<s:param value=”%{codeList}” />      <s:param value=”%{statusList}” />

</s:merge> <s:iterator value=”%{#myMergedIterator}”>

<s:property /> </s:iterator>

You are asked to change the current feature of displaying the report

result in HTML table to a downloadable Excel format with a default file name as “Y2008.xls”.

Which of the following is correct way to implement the same?

These kinds of questions on struts framework cannot be answered by a person who has not worked with Struts.  So take the test and give us your feedback.

Java Servlet technology provides Web developers with a simple, consistent mechanism for extending the functionality of a Web server and for accessing existing business systems.

Together JSP and servlets are an integral component of any web application .

This is free JSP and Servlet interview question test to check your knowledge and help you prepare for interview.

This another Servlet and JSP Interview questions test and also has question on JSTL (JavaServer Pages Standard Tag Library)

Struts interview questions 1

These are the test which have questions designed to test your concepts as well as practical skills. for eg questions like

You have created a action class called TakeTestAction to dispatch to takeTest.jsp and have configured in struts.xml. The class has only one method named perform() and does not have execute() method.

Which of the following is true?

Another one

You have written a Action class with multiple methods create(), update() and delete().  But, you are asked to configure 3 distinct actions in struts.xml. Which of the following is the best way to implement?

These kinds of questions on struts framework cannot be answered by a person who has not worked with Struts. So this tests will test your knowledge and skills.

The pre tags in IE 7 do wrap the text but the table width will remain wider and scrollbar appears, as if the text is taking full space. This problem doesn’t come in Firefox and Chrome. Can anyone help me out defining proper style for IE 7 for pre tags. for eg of you look at this code

Solution : Use  table-layout: fixed;

If you apply the table-layout:fixed style for the inner table, where the data is in different columns, all columns get same area irrespective of their defined width.  But if applied it to the outer table, and it works fine.

But things change completely in world wide web world. SEO is hot . All the pages should have a unique user friendly url.

In Skill-Guru although we had unique url for the test pages, they were never user friendly. Our url’s were like

http://www.skill-guru.com/skill/login/getAllTestsByCategory.faces?cagtegoryId=1&cagtegoryName=Certification

http://www.skill-guru.com/skill/login/fetchRelatedTestsPosts.faces?tag=scjp

So we took the project of re architecting the application to have a clean , user friendly , bookmarkable url.  We looked at couple of options like url rewriting in .htaccess file on the server.

Then we discovered pretty faces.  Pretty faces utility has been written by Lincoln Baxter. This makes life so much easier for application developer . It also left the control with the developer to manage the url within the application instead of managing on server.

I am not going into details of pretty faces as Lincoln has done an excellent job on documentation. Now the url’s in our application are user freindly.

http://www.skill-guru.com/cat/sat-practice-test

http://www.skill-guru.com/test/79/passage-based-reading-test-1

Thanks to pretty faces we now have pretty URL’s.

JMeter supports HTTP, HTTPS, FTP, SOAP, POP3, JDBC, thus enabling its use to test most of the applications. It has record and playback capability which enables easy test case creation. But, it can directly record only HTTP requests and supports HTTPS spoofing which is not completely reliable.

Steps to setup JMeter and create test plan :-

1. Download the latest version of JMeter from the website http://jakarta.apache.org/
2. Run the batch file in JMeter folder -> bin -> jmeter.bat

Below is the snap shot of the Apache JMeter Tool.

3.Right click “add à Config element àHttp Request Defaults

4. Fill the server / ip address and port details

Path can specify the landing web page for ex: login / home page

5. Create a Proxy server and provide the port number for which the browser listens

6. Change the Browser LAN settings, set the same port as that we set in the JMeter proxy settings.

7. Click on the Start button in the Http proxy server window.

8. Open the browser and type the URL http://jakarta.apache.org/

9. And browse the jmeter links.

10. Click on Stop button in the Http proxy server window.

Above snapshot shows the recorded test data.

11. Add the Summary Report

12. Open the Thread Group window and change the number of threads / users to 5 (you can change the value to any number which you want to record).

13. Select Run -> Start in the JMeter menu options.

14. Summary Report will be populated with the test results for the modified number of users set in the thread group window.

Following problem might occur when you are trying to test the web application using the JMeter.

Problem Analysis

I am trying to do the load testing of our web application using JMeter tool.

I setup the JMeter client in my local machine.

And did the proxy setting as below

When I am trying to test the application residing in the LAN, I am able to test the applications properly

But when I am trying to test the internet applications I am getting the following exception

Exception Trace.

java.net.UnknownHostException: www.google.com at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177) at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366) at java.net.Socket.connect(Socket.java:519) at java.net.Socket.connect(Socket.java:469) at java.net.Socket.(Socket.java:366) at java.net.Socket.(Socket.java:239) at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:80) at org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:122) at org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:707) at org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:387) at org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:171) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397) at org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323) at org.apache.jmeter.protocol.http.sampler.HTTPSampler2.sample(HTTPSampler2.java:854) at org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1037) at org.apache.jmeter.protocol.http.proxy.Proxy.run(Proxy.java:195)

Please let me know if you have any idea / solution for this issue.

Solution

If we are testing from behind a firewall/proxy server, we may need to provide JMeter with the firewall/proxy server hostname and port number. To do so, run the jmeter.bat/jmeter file from a command line with the following parameters:

Example : jmeter -H my.proxy.server -P 8000 -u username -a password -N localhost

So I think we need to find the firewall / proxy server details to test this or we need to test this outside LAN network.

1. The introduction of  View scopes, flash scope and custom scope - View scopes,Flash scopes and custom scopes are ‘bigger than request scope but smaller than session scope’. Many times developers are forced to keep objects in session scope just because they want the objects available till end of their front view operation or make them work in the redirection or till end of their front end operation.  For example you might have experienced implementing edit/delete/ add operations to datatable,  many times its necessary to make the bean session scope to make it working right way. This can be avoided by view scope variables. The custom scope helps objects to be available till end of user operation (user has to decide the scope of bean). This is like flow scope.Flow scopes were offered by frameworks like spring webflow etc .. But for an application already done in JSF, it is easier to shift to JSF2 than webflow.
2. The Ajax support from JSF core: Earlier Ajax support and components were provided by third party implementations. There was no support from JSF core. JSF 2 fulfills this.
3. Navigation is made easy. Concepts like, implicit navigation helps lesser xml definitions.

4. No managed bean configuration. (Only with spring there was such feature)

5. Direct use of #{}. Earlier if we wanted to output some data from bean to html, we had to do it by <h:outputText value=”#{bean.property}”>. But now we can use just ”#{bean.property}. Also jsf provides components to specify style sheets.

6. Support for get requests. New two components h:button and h:link are added, which will generate GET requests. Now there is no need to hardcoding url in outputLink.
7. Components can also specify client side behavior . Eg:asking confirmation before submitting a link/Button now can be specified in JSF without javascript.
8. Validations made easy.

Click here (http://jcp.org/en/jsr/detail?id=314) to check out for detailed specification document.

If your site is dynamic website and has new contents being churned out frequently , sitemaps are really important.

Quoting google webmaster

Sitemaps are particularly helpful if:

• Your site has dynamic content.
• Your site has pages that aren’t easily discovered by Googlebot during the crawl process – for example, pages featuring rich AJAX or Flash.
• Your site is new and has few links to it. (Googlebot crawls the web by following links from one page to another, so if your site isn’t well linked, it may be hard for us to discover it.)
• Your site has a large archive of content pages that are not well linked to each other, or are not linked at all.

I will give one example of sitemaps in dynamic websites. Sites like  Stackoverflow have a sitemap.xml file is created which contains a link to every question posted on the system. When a new question is posted, they simply append another entry to the end of the sitemap file.

Read this if you want to find more about importance of sitemaps.

We have a site map for our Skill-Guru blog at this stage and not for complete application . The blog uses wordpress and we used XML-Sitemap to generate sitemaps for us

For the Skill Guru site ,  we do not have very clean URL’s and are in process of fixing them. Once we have clean bookmarkable URL’s , we will submit sitemap for complete Skill-guru site.

How do we plan to do that ?

Still looking for best option. Any suggestion would be appreciated.

http://www.skill-guru.com/skill/login/testDetails/12/testName/SCJP-6-Mock-Practice-Test

Now this may be a good programming practice but it is not a good practice from user perspective.  Mixed case URLs are an absolute no-no, as Unix and Linux servers are case sensitive. Having mixed case URLs drastically increases the possibility of typos . It is always difficult for users to remember the url (if they can).

So try to keep all your url’s in lower case.

Browser functionality can be disabled using the JavaScript. JavaScript has the ability to capture and handle the key events. We will look at couple of examples on how to trigger browser functionality using Java script.

Disabling new page event and ctr key event in browser

Following is the example which shows how to disable the ctrl + N (new page event) and back button in the browser.

<html>

<body onkeydown=”return
fnDisableNewPage(event)” >

<p>Test</p>

<script>

/******************************************************************************

*FunctionName          :funcDisNewPage()

*Description           :This function disables ctrl+key
combinations

*Input Parameters      : event

*Returns               :true

*****************************************************************************/

function funcDisNewPage(e)

{

var forbiddenKey = ‘N’;

var key;

var isCtrl;

//Check for the event

if( window.event )

{

//IE

key = window.event.keyCode;

//check is Ctrl key is pressed

if( window.event.ctrlKey )

{

isCtrl = true;

}

else

{

isCtrl = false;

}

}

else

{

//firefox

key = e.which;

//check if Ctrl key is pressed

if( e.ctrlKey )

{

isCtrl = true;

}

else

{

isCtrl = false;

}

}

//if ctrl is pressed check if other key is same as
the forbidenKey

if( isCtrl )

{

//case-insensitive comparation

if( forbiddenKey.toLowerCase() ==
String.fromCharCode(key).toLowerCase()  )

{

//give an alert if
Ctrl+n is pressed

alert( “You
cannot create a copy of the Current Form by using CTRL + N
“);

return false;

}

}

return true;

}

Disabling back button in browser

/******************************************************************************

*FunctionName          :funcDisBack()

*Description           :The function disables the back
button of browser

*****************************************************************************/

function funcDisBack()

{

history.go(+1);

}

</script>

</body>

</html>

Following table show the Keyboard keys and event code
mappings.

These key codes are using the JavaScript to disable the
browser functionalities.

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