Nelson Nadal

Are there any existing patterns we can apply in the development for this new device or environment? How steep is the learning curve from ordinary java programmer? Thankd

Is the site official, true, authentic (learnnowonline.com)? I received email from you promoting the site, just want to make sure if this is really coming from you, thanks.

I installed jdk1.6 and its ok.
When I installed Java Application Server PE it created another directory and file javac.exe 1.4 and put it in the path.

When I use and IDE the compilation is ok.

When I compile under DOS command, other objects cant find and generates "cannot find symbol" error.

What will going to I delete? Thanks.

as a follow up... according to WEB SERVICES FAQ... JAX-RPC, JWSDP, Axis 1, Apache SOAP are now obsolete... and those are discussed on those books I mentioned. That's why I am asking if I am just wasting my time reading it or at least if I will gain something as a starter to web services, thanks..

I got books about Java and Web Services (below)

XML programming: Web Application and WEb Srvices with JSP,
XML Web Services Professional Projects,
Pro XML Dev w/Java technology,
Building Web Services with Java

but it published around 2003, 2002.... is it worthwhile to read and learn from it or I am just wasting my time? Many thanks.

Nelson

I'm just newbie in JSF and I was stuck in this code for the whole day.

I've got a simple JSP program where you can put on a textfield and guess the generated random number, it has a link where you can reload (to generate new random number and initialize the i variable as number of attemps made) . When I use the navigational case xml in faces-config.xml and use the class in CODE A, the program is working fine.

But when I modified the the class and make another class as listener the i variable and generatedNumber is not initializing anymore. I almost ran out of solution. Please help.

the jsp program simply runs like this.

in start of prgram, the class will generated a random number (0-9).
Then I will put my number to guess.
If not correct i variable will increment by one (this is the number of attempts made)

In case I click the 'Reload' link, there should be another random number and i variable shld go to 0 again.


The problem:
When I click 'Reload' link its not doing another random number, and i variable never return to 0
instead
the old random number shows and i variable continues to increment.


Other story:
The CODE A, this is working fine. When I click' Reload' in my JSP, its generated new number and variable i initializes again.

Then I changed it as listener, then the problem (I stated above) occurs.


I hope my story is clear, I really stuck in this problem, thanks and appreciate your help. If you need more clearer explanation please just tell me to elaborate more.




CODE A
package game; import java.util.*; import javax.faces.context.FacesContext; import javax.servlet.http.HttpSession; public class GameBean { /*Property declaration*/ private String userNumber; private String result; private String attempt; private int generatedNumber; int i=0; public GameBean() { /*Generate a random number*/ generatedNumber = (int)(Math.random()*10); } /*Accessor method for user number*/ public String getUserNumber() { return userNumber; } /*Mutator method for user number*/ public void setUserNumber(String userNumber) { this.userNumber=userNumber; } /*Accessor method for result*/ public String getResult() { return result; } /*Mutator method for result*/ public void setResult(String result) { this.result=result; } /*Accessor method for attempt*/ public String getAttempt() { return attempt; } /*Mutator method for result*/ public void setAttempt(String attempt) { this.attempt=attempt; } /*Implement the play() method*/ public void play() { i++; int tempNumber=Integer.parseInt(userNumber); /*If user specified number is equal to generated number*/ if (tempNumber==generatedNumber) { /*Set result and attempt properties*/ setResult("Congratulation! You specified "+userNumber+" and your number matches with our number."); setAttempt("You have attempted "+i+" times"); } /*If user specified number is less than generated number*/ else if(tempNumber<generatedNumber) { /*Set result and attempt properties*/ setResult("Sorry! You specified "+userNumber+", but your number does not match with our number. Enter a higher number."); setAttempt("You have attempted "+i+" times"); } /*If user specified number is greater than generated number*/ else if(tempNumber>generatedNumber) { /*Set result and attempt properties*/ setResult("Sorry! You specified "+userNumber+", but your number does not match with our number. Enter a lower number."); setAttempt("You have attempted "+i+" times"); } } public void load() { /*Invalidate session*/ FacesContext context = FacesContext.getCurrentInstance(); HttpSession session = (HttpSession) context.getExternalContext().getSession(false); session.invalidate(); } }








CODE B

package game; import java.util.*; import javax.faces.event.AbortProcessingException; import javax.faces.event.ActionEvent; import javax.faces.event.ActionListener; import javax.faces.context.FacesContext; import javax.faces.el.ValueBinding; import javax.faces.FactoryFinder; import javax.servlet.http.HttpSession; import javax.faces.application.ApplicationFactory; import javax.faces.application.Application; public class GameListener implements ActionListener { private String userNumber; private String result; private String attempt; private int generatedNumber; private ValueBinding resultBinding, attemptBinding; private int i; /*Class constructor*/ public GameListener() { /*Generate single digit random number*/ generatedNumber = (int)(Math.random()*10); } public void processAction(ActionEvent event) throws AbortProcessingException { /*Retrieve the command ID that generates an event*/ String command= event.getComponent().getId(); /*If button generates event*/ if(command.equals("submit")) { i++; /*Generate a random number*/ String current = event.getComponent().getId(); /*Retrieve the FacesContext object of the current application*/ FacesContext facesContext = FacesContext.getCurrentInstance(); /*Retrieve end user specified number*/ userNumber =(String)getValueBinding("#{gameBean.userNumber}").getValue(facesContext); /*Convert number to primitive int type*/ int tempNumber=Integer.parseInt(userNumber); /*Retrieve ValueBinding objects for the result and attempt properties*/ resultBinding= getValueBinding("#{gameBean.result}"); attemptBinding=getValueBinding("#{gameBean.attempt}"); /*if user specified number is equal to generated number*/ if (tempNumber==generatedNumber) { /*Set result and attempt properties*/ result="Congratulation! You specified "+userNumber+" and your number matches with our number."; resultBinding.setValue(facesContext, result); attempt="You have attempted "+i+" times"; attemptBinding.setValue(facesContext, attempt); } /*If user specified number is less than generated number*/ else if(tempNumber<generatedNumber) { /*Set result and attempt properties*/ result="Sorry! You specified "+userNumber+", but your number does not match with our number. Enter a higher number."; attempt="You have attempted "+i+" times"; resultBinding.setValue(facesContext, result); attemptBinding.setValue(facesContext, attempt); } /*If user specified number is greater than generated number*/ else if(tempNumber>generatedNumber) { /*Set result and attempt properties*/ result="Sorry! You specified "+userNumber+", but your number does not match with our number. Enter a lower number."; attempt="You have attempted "+i+" times"; resultBinding.setValue(facesContext, result); attemptBinding.setValue(facesContext, attempt); System.out.println(attempt+" inside greater"); } } else if (command.equals("link")) { /*Invalidate session*/ FacesContext context = FacesContext.getCurrentInstance(); HttpSession session = (HttpSession) context.getExternalContext().getSession(false); session.invalidate(); i=0; } } /*Method that returns a ValueBinding object for a particular value binding expression*/ private static ValueBinding getValueBinding(String valueRef) { /*Create an ApplicationFactory object*/ ApplicationFactory factory = (ApplicationFactory)FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY); /*Obtain a Application object that represents the JSF application*/ Application application = factory.getApplication(); /*Call the createValueBinding() method to create a ValueBindin object*/ return application.createValueBinding(valueRef); } }

yes you're right, this is only matter of testing or familiriazation of generated html by JSF custom tag.
Thanks again.

Hi,

just want to know if it is advisable to mix up CSS to my JSF file? or its not a big deal not to use some JSF html custom tag library?
It seems other CSS has no effecgt to some JSF html custom tag like the <h:commandButton>.
But for the <h:outputText> it's fine.

Thanks.

I'm a web developer (passed SWCD) but wanted to get SCJD too.

I 've SCJD Exam with J2SE 5, but to be honest I got lost always in the middle of Thread topic. I knew generally how it works but the details makes me always sick. I always restart that topic to understand it. So I cant move on.

I dont know if there is another way around to have a good look on SJCD.

Maybe I just need encouragement or more advice how to approach this kind of review. Am I just going to code, compile and run the provided codes here first and then later just read the explanation.

Thanks, just confuzed here.

Thanks a lot, i thought this a new reserved keyword.

Thank you very much for prompt reply, will read more on this. Till next time.

Here is the part of the code from a book titled Web Development:Using Struts by instantCode

public class SearchAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) { com.shoppingcart.SearchForm SearchForm = (com.shoppingcart.SearchForm) form; /* Retrieves the category and keyword from the search page */ String category=SearchForm.getCategory(); String keyWord=SearchForm.getKeyword(); /* Verifies wheather the proper category and keyword is submitted */ if(category.equals("nill") && keyWord.length()<3) { SearchForm.setStatus("Please specify a valid search criteria. A keyword must be of 3 or more characters."); request.setAttribute("searchForm",SearchForm); return mapping.getInputForward(); } else

Just want to know what is nill? is it the same as null? Thanks.

I have a login.jsp that when you submit the action is /login

it has a LoginAction.java that has a code...

return mapping.findForward("success");

in struts-config.xml
<action path="/login" type="com.shoppingcart.LoginAction" attribute="com.shoppingcart.LoginFormBean" name="LoginFormBean" scope="request" input="/Login.jsp"> <forward name="success" path="/Search.jsp"/> </action>

... so when it forwards to "/Search.jsp" my question is...
will it execute the SearchForm.java indicated also in struts-config.xml (below)?

<!-- Action mapping for the search action --> <action path="/search" type="com.shoppingcart.SearchAction" attribute="com.shoppingcart.SearchForm" name="SearchForm" scope="request" input="/Search.jsp"> </action>

What I only know is, it will only execute if submit a form and the action in the form is action="/search". Or it will still execute even only you forward it to "/Search.jsp"?

Please enlighten me, thanks

Im just new to struts, though I've read some documentation with <logic resent name> tag I still dont understand it...

My question is is the name attribute referring to ANY object variable present in the session?

Thanks.