Gaurav Pravin Dighe

I need to find how many visitors visited by website and display it on my website as "Total Number Of Visitor: ####". I am not looking for database approach.

I am thinking of using Listener Classes and Interfaces, but i don't have any idea.

Please help.

Hello Lucas,

Thanks for the reply.

I have downloaded the book you just mentioned. i also want to ask, which server should i prefer for learning the EJB and other Java EE concepts, that will help me crack interview of Java EE.
I also want to know, Spring Framework and Web Services is also in demand. Could you please guide me which technology i should learn and concentrate(along with books) for cracking interviews. I have knowledge on below Java Technologies:
1. Core Java
2. Servlet, JSP
3. Hibernate (basics)
4. Struts2
5. Working on Netbeans IDE

Sir your advice matters to me alot.

Hello,

I want to learn EJB 3.1. Please suggest me some good tutorial/video tutorial for learning EJB 3.1. I have downloaded official javaee6-tutorial from webpage.

But the tutorial seems to be for some one who has some idea about EJB.

Please advice me.

Hi,

I want to learn Web Services in Java. I really don't have any knowledge on Web Services. I only know is that it should be incorporated with Application Server.

Please guide me for learning Web Services.

Regards

Peter,

Thank you very much. Could you please provide me resolution for your comment
"3. This is a typical issue with the m2e plugin - perform the recommended fix and the problem goes away. (In my dev environment we have a parent POM that contains the fix so that we don't have to put it into every POM) "

I tried to do quick fix in eclipse. But it is not getting fixed. Please help me out with this.

Regards

I am new to Maven Development. I have installed JDK7, Maven 3.0.5, Eclipse and M2E plugin for eclipse.

I want to create the JavaEE6 Web Project in eclipse. Therefore I created project using webapp-javaee6 archetype. Its giving me below issues:
1. web.xml is not created.
2. test and Resources folders are not created.
3. Plugin execution not covered by lifecycle configuration: org.apache.maven.plugins:maven-dependency-plugin:2.1:copy (execution: default, phase: validate). Maven Project Build Lifecycle Mapping Problem. I am getting this error on line 53 of pom.xml
4. How to make this project work with glassfish3 / weblogic 12c.

pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>org.gaurav</groupId> <artifactId>WebJavaEE6</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>WebJavaEE6</name> <properties> <endorsed.dir>${project.build.directory}/endorsed</endorsed.dir> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>javax</groupId> <artifactId>javaee-web-api</artifactId> <version>6.0</version> <scope>provided</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>2.3.2</version> <configuration> <source>1.6</source> <target>1.6</target> <compilerArguments> <endorseddirs>${endorsed.dir}</endorseddirs> </compilerArguments> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>2.1.1</version> <configuration> <failOnMissingWebXml>false</failOnMissingWebXml> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-dependency-plugin</artifactId> <version>2.1</version> <executions> <execution> <phase>validate</phase> <goals> <goal>copy</goal> </goals> <configuration> <outputDirectory>${endorsed.dir}</outputDirectory> <silent>true</silent> <artifactItems> <artifactItem> <groupId>javax</groupId> <artifactId>javaee-endorsed-api</artifactId> <version>6.0</version> <type>jar</type> </artifactItem> </artifactItems> </configuration> </execution> </executions> </plugin> </plugins> </build> </project>

Hello All,

I need to develop a java web application(Human Resource Module) using Struts Framework, JSP, Servlets, AJAX and MySQL.

I have also came to know that there are many designing tools with AJAX support are available to simplify the high end web designing that can be integrated with JSP, Struts and Servlets.

Can any one guide me which tools can be used?

Regards,
Gaurav Dighe

Hello All,

I am using Oracle 11g and Hibernate 3.6.10 in Java Application. I am at starting level of Hibernate.
I have a table name USERDETAILS

UserDetails
---------------------
userID-----------PK---Oracle 11g Sequence created
userName

Could you please uide me which generatot to be used

Below is the hibernate.cfg.xml

<id name="userID" column="USERID"> <generator class="" /> </id>

Could anyone let me know which generator class to be used?

Hi,

I am web developer who uses Java EE technologies to develop web applications and i am a student. I just want to know whether Java FX can be used with Struts for web designing.

If can be used, then i can learn this technology.

Hi,

I am learning validation. But the validation is checked but the business code is never executed, which will check the data against the database.

Please help me out
I am trying to develop a login module using Struts, Validation Framework and Database.

sid and password are validated using validator framework-----if validation fails then same page with error msgs will be displayed---------if validated, then execution of business logic should begin, which will check whether its matching with the table or not......if matching then display success.jsp or else display failure.jsp page

Database contains the Student Table:
SID SNAME PASSWORD
-----------------------------------
gd gaurav aaa111
dd deepti ajsj223


index.jsp
<%@ page contentType="text/html; charset=utf-8" language="java" import="java.sql.*" errorPage="" %> <%@taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> <%@taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %> <%@taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %> <!DOCTYPE HTML> <html:html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Home Page</title> <style type="text/css"> <!-- body { font: 100%/1.4 Verdana, Arial, Helvetica, sans-serif; background: #42413C; margin: 0; padding: 0; color: #000; } /* ~~ Element/tag selectors ~~ */ ul, ol, dl { /* Due to variations between browsers, it's best practices to zero padding and margin on lists. For consistency, you can either specify the amounts you want here, or on the list items (LI, DT, DD) they contain. Remember that what you do here will cascade to the .nav list unless you write a more specific selector. */ padding: 0; margin: 0; } h1, h2, h3, h4, h5, h6, p { margin-top: 0; /* removing the top margin gets around an issue where margins can escape from their containing block. The remaining bottom margin will hold it away from any elements that follow. */ padding-right: 15px; padding-left: 15px; /* adding the padding to the sides of the elements within the blocks, instead of the block elements themselves, gets rid of any box model math. A nested block with side padding can also be used as an alternate method. */ } a img { /* this selector removes the default blue border displayed in some browsers around an image when it is surrounded by a link */ border: none; } /* ~~ Styling for your site's links must remain in this order - including the group of selectors that create the hover effect. ~~ */ a:link { color: #42413C; text-decoration: underline; /* unless you style your links to look extremely unique, it's best to provide underlines for quick visual identification */ } a:visited { color: #6E6C64; text-decoration: underline; } a:hover, a:active, a:focus { /* this group of selectors will give a keyboard navigator the same hover experience as the person using a mouse. */ text-decoration: none; } /* ~~ This fixed width container surrounds all other blocks ~~ */ .container { width: 960px; background: #FFFFFF; margin: 0 auto; /* the auto value on the sides, coupled with the width, centers the layout */ } /* ~~ The header is not given a width. It will extend the full width of your layout. ~~ */ header { background: #ADB96E; } /* ~~ These are the columns for the layout. ~~ 1) Padding is only placed on the top and/or bottom of the block elements. The elements within these blocks have padding on their sides. This saves you from any "box model math". Keep in mind, if you add any side padding or border to the block itself, it will be added to the width you define to create the *total* width. You may also choose to remove the padding on the element in the block element and place a second block element within it with no width and the padding necessary for your design. 2) No margin has been given to the columns since they are all floated. If you must add margin, avoid placing it on the side you're floating toward (for example: a right margin on a block set to float right). Many times, padding can be used instead. For blocks where this rule must be broken, you should add a "display:inline" declaration to the block element's rule to tame a bug where some versions of Internet Explorer double the margin. 3) Since classes can be used multiple times in a document (and an element can also have multiple classes applied), the columns have been assigned class names instead of IDs. For example, two sidebar blocks could be stacked if necessary. These can very easily be changed to IDs if that's your preference, as long as you'll only be using them once per document. 4) If you prefer your nav on the left instead of the right, simply float these columns the opposite direction (all left instead of all right) and they'll render in reverse order. There's no need to move the blocks around in the HTML source. */ .sidebar1 { float: right; width: 180px; background: #EADCAE; padding-bottom: 10px; } .content { padding: 10px 0; width: 780px; float: right; } /* ~~ This grouped selector gives the lists in the .content area space ~~ */ .content ul, .content ol { padding: 0 15px 15px 40px; /* this padding mirrors the right padding in the headings and paragraph rule above. Padding was placed on the bottom for space between other elements on the lists and on the left to create the indention. These may be adjusted as you wish. */ } /* ~~ The navigation list styles (can be removed if you choose to use a premade flyout menu like Spry) ~~ */ nav ul { list-style: none; /* this removes the list marker */ border-top: 1px solid #666; /* this creates the top border for the links - all others are placed using a bottom border on the LI */ margin-bottom: 15px; /* this creates the space between the navigation on the content below */ } nav ul li { border-bottom: 1px solid #666; /* this creates the button separation */ } nav ul a, nav ul a:visited { /* grouping these selectors makes sure that your links retain their button look even after being visited */ padding: 5px 5px 5px 15px; display: block; /* this gives the link block properties causing it to fill the whole LI containing it. This causes the entire area to react to a mouse click. */ width: 160px; /*this width makes the entire button clickable for IE6. If you don't need to support IE6, it can be removed. Calculate the proper width by subtracting the padding on this link from the width of your sidebar container. */ text-decoration: none; background: #C6D580; } nav ul a:hover, nav ul a:active, nav ul a:focus { /* this changes the background and text color for both mouse and keyboard navigators */ color: #FFF; background-color: #888; } /* ~~ The footer ~~ */ footer { padding: 10px 0; background: #CCC49F; position: relative;/* this gives IE6 hasLayout to properly clear */ clear: both; /* this clear property forces the .container to understand where the columns end and contain them */ } /*HTML 5 support - Sets new HTML 5 tags to display:block so browsers know how to render the tags properly. */ header, section, footer, aside, nav, article, figure { display: block; } --> </style><!--[if lt IE 9]> <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> <![endif]--> </head> <body> <div class="container"> <header> <a href="#"><img src="" alt="Insert Logo Here" name="Insert_logo" width="180" height="90" id="Insert_logo" style="background: #C6D580; display:block;" /></a> </header> <div class="sidebar1"> <nav> <ul> <li><a href="#">Link one</a></li> <li><a href="#">Link two</a></li> <li><a href="#">Link three</a></li> <li><a href="#">Link four</a></li> </ul> </nav> <aside> <p> The above links demonstrate a basic navigational structure using an unordered list styled with CSS. Use this as a starting point and modify the properties to produce your own unique look. If you require flyout menus, create your own using a Spry menu, a menu widget from Adobe's Exchange or a variety of other javascript or CSS solutions.</p> <p>If you would like the navigation along the top, simply move the ul to the top of the page and recreate the styling.</p> </aside> <!-- end .sidebar1 --></div> <article class="content"> <h3>Online Application</h3> <section> <p>  <logic:messagesPresent> <font color="red"> <html:messages id="error"> <li>   <%=error%> </li> </html:messages> </font> </logic:messagesPresent> </p> <html:form action="loginAction" method="post"> <table width="443" border="0"> <tr> <td width="189">SID</td> <td width="188"><html:text property="sid"/></td> <td width="44"></td> </tr> <tr> <td>Password</td> <td><html:password property="password"/></td> <td> </td> </tr> <tr> <td> </td> <td> </td> <td> </td> </tr> <tr> <td> <html:submit value="Login" /> </td> <td></td> <td> </td> </tr></a> </table> </html:form> </section> <!-- end .content --></article> <footer> <p>This footer contains the declaration position:relative; to give Internet Explorer 6 hasLayout for the footer and cause it to clear correctly. If you're not required to support IE6, you may remove it.</p> <address> Address Content </address> </footer> <!-- end .container --></div> </body> </html:html>

success.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <%@taglib uri="/WEB-INF/struts-bean.tld"prefix="bean" %> <%@taglib uri="/WEB-INF/struts-html.tld"prefix="html" %> <!DOCTYPE html> <html:html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Success Page</title> </head> <body> <h1>Authentication Successful</h1> <p>WELCOME <bean:write name="LoginForm" property="sid"/></p> </body> </html:html>

failure.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Failure Page</title> </head> <body> <h1>Authentiction not successful</h1> </body> </html>

OracleConnection.java---------------for establishing connection and then checking the data
package entity; /** * * @author Administrator */ import com.sun.crypto.provider.RSACipher; import java.sql.*; public class OracleConnection { Connection con; Statement st; public OracleConnection() { con = this.getConnection(); } public Connection getConnection() { try { Class.forName("oracle.jdbc.OracleDriver"); con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl", "scott", "tiger"); if (con != null) { System.out.println("Connection established with Oracle !!!"); } } catch (ClassNotFoundException cfe) { } catch (SQLException se) { } return con; } public void addStudent(String sid, String sname, String email, String password) { String inserSQL = "insert into student values('" + sid + "','" + sname + "','" + email + "','" + password + "')"; try { st = con.createStatement(); int x = st.executeUpdate(inserSQL); if (x == 1) { System.out.println("Student added to Student table in Oracle !!!"); } } catch (SQLException se) { } } public boolean authenticate(String sid, String password) { try { st = con.createStatement(); ResultSet rs = st.executeQuery("select sid from student where sid='"+sid+"' and password='"+password+"'"); if(rs.next()){ System.out.println("Data found"); } }catch(Exception e){ return false; } return true; } }

LoginAction.java
package com.myapp.struts; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import entity.OracleConnection; /** * * @author Administrator */ public class LoginAction extends org.apache.struts.action.Action { /* forward name="success" path="" */ private static final String SUCCESS = "success"; private static final String FAILURE = "failure"; /** * This is the action called from the Struts framework. * @param mapping The ActionMapping used to select this instance. * @param form The optional ActionForm bean for this request. * @param request The HTTP Request we are processing. * @param response The HTTP Response we are processing. * @throws java.lang.Exception * @return */ @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { LoginForm lf = (LoginForm) form; OracleConnection oc = new OracleConnection(); String sid = lf.getSid(); String password = lf.getPassword(); if (oc.authenticate(sid, password)) { return mapping.findForward(SUCCESS); }else{ return mapping.findForward(FAILURE); } } }


LoginForm.java
package com.myapp.struts; import javax.servlet.http.HttpServletRequest; import org.apache.struts.action.ActionErrors; import org.apache.struts.action.ActionMapping; import org.apache.struts.action.ActionMessage; /** * * @author Administrator */ public class LoginForm extends org.apache.struts.validator.ValidatorForm { private String sid, password; public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getSid() { return sid; } public void setSid(String sid) { this.sid = sid; } }

validation.xml
<formset> <!-- An example form --> <form name="LoginForm"> <field property="sid" depends="required"> <arg key="LoginForm.sid"/> </field> <field property="password" depends="required,mask"> <arg key="LoginForm.password"/> <var> <var-name>mask</var-name> <var-value>^[0-9a-zA-Z]*$</var-value> </var> </field> </form> </formset>

struts-config.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://jakarta.apache.org/struts/dtds/struts-config_1_3.dtd"> <struts-config> <form-beans> <form-bean name="LoginForm" type="com.myapp.struts.LoginForm"/> </form-beans> <global-exceptions> </global-exceptions> <global-forwards> <forward name="success" path="/success.jsp"/> <forward name="failure" path="/failure.jsp"/> <forward name="welcome" path="/Welcome.do"/> </global-forwards> <action-mappings> <action input="/home.jsp" name="LoginForm" path="/loginAction" scope="session" type="com.myapp.struts.LoginAction"/> <action path="/Welcome" forward="/welcomeStruts.jsp"/> </action-mappings> <controller processorClass="org.apache.struts.tiles.TilesRequestProcessor"/> <message-resources parameter="com/myapp/struts/ApplicationResource"/> <!-- ========================= Tiles plugin ===============================--> <!-- This plugin initialize Tiles definition factory. This later can takes some parameters explained here after. The plugin first read parameters from web.xml, thenoverload them with parameters defined here. All parameters are optional. The plugin should be declared in each struts-config file. - definitions-config: (optional) Specify configuration file names. There can be several comma separated file names (default: ?? ) - moduleAware: (optional - struts1.1) Specify if the Tiles definition factory is module aware. If true (default), there will be one factory for each Struts module. If false, there will be one common factory for all module. In this later case, it is still needed to declare one plugin per module. The factory will be initialized with parameters found in the first initialized plugin (generally the one associated with the default module). true : One factory per module. (default) false : one single shared factory for all modules - definitions-parser-validate: (optional) Specify if xml parser should validate the Tiles configuration file. true : validate. DTD should be specified in file header (default) false : no validation Paths found in Tiles definitions are relative to the main context. --> <plug-in className="org.apache.struts.tiles.TilesPlugin" > <set-property property="definitions-config" value="/WEB-INF/tiles-defs.xml" /> <set-property property="moduleAware" value="true" /> </plug-in> <!-- ========================= Validator plugin ================================= --> <plug-in className="org.apache.struts.validator.ValidatorPlugIn"> <set-property property="pathnames" value="/WEB-INF/validator-rules.xml,/WEB-INF/validation.xml"/> </plug-in> </struts-config>

Hi,
want to find how many times "a" appeared in String aahhsjhglahfagha".
I have found a StringUtils class in org.apache.commons.lang.StringUtils. I want to use it.

Below are the description of StringUtils:

public class StringUtils
extends Object

Operations on String that are null safe.

IsEmpty/IsBlank - checks if a String contains text
Trim/Strip - removes leading and trailing whitespace
Equals - compares two strings null-safe
startsWith - check if a String starts with a prefix null-safe
endsWith - check if a String ends with a suffix null-safe
IndexOf/LastIndexOf/Contains - null-safe index-of checks
IndexOfAny/LastIndexOfAny/IndexOfAnyBut/LastIndexOfAnyBut - index-of any of a set of Strings
ContainsOnly/ContainsNone/ContainsAny - does String contains only/none/any of these characters
Substring/Left/Right/Mid - null-safe substring extractions
SubstringBefore/SubstringAfter/SubstringBetween - substring extraction relative to other strings
Split/Join - splits a String into an array of substrings and vice versa
Remove/Delete - removes part of a String
Replace/Overlay - Searches a String and replaces one String with another
Chomp/Chop - removes the last part of a String
LeftPad/RightPad/Center/Repeat - pads a String
UpperCase/LowerCase/SwapCase/Capitalize/Uncapitalize - changes the case of a String
CountMatches - counts the number of occurrences of one String in another
IsAlpha/IsNumeric/IsWhitespace/IsAsciiPrintable - checks the characters in a String
DefaultString - protects against a null input String
Reverse/ReverseDelimited - reverses a String
Abbreviate - abbreviates a string using ellipsis
Difference - compares Strings and reports on their differences
LevensteinDistance - the number of changes needed to change one String into another

The StringUtils class defines certain words related to String handling.

null - null
empty - a zero-length string ("")
space - the space character (' ', char 32)
whitespace - the characters defined by Character.isWhitespace(char)
trim - the characters <= 32 as in String.trim()

StringUtils handles null input Strings quietly. That is to say that a null input will return null. Where a boolean or int is being returned details vary by method.

A side effect of the null handling is that a NullPointerException should be considered a bug in StringUtils (except for deprecated methods).

Methods in this class give sample code to explain their operation. The symbol * is used to indicate any input including null.


If i go in normal way i would have to write the program like this

public class CountMatch{ public static void main(String[] args){ int count = countChars('a',"abcabcabcabcaa"); System.out.println("Count of a in abcabcabcabcaa = "+ count); } public static int countChars(char c, String s) { int result = 0; for (int i = 0, n = s.length(); i < n; i++) { if (s.charAt(i) == c) { result++; } } return result; } }

With StringUtils class countMatches() method the above task can be accomplished.

public static int countMatches(String str,
String sub)

Counts how many times the sub string appears in the larger String.


when i tried to use it i am not able to compile my program. Below is the code.

public class CountMatch{ public static void main(String[] args){ int count = StringUtils.countMatches("abcabcabcabcaa", "a"); System.out.println("Count = " + count); } }

Please suggest what can be done?

HI,

I do have a some doubts regarding Spring Certification....

1. Is it mandatory to attend traiing or
2. If i learn spring from online tutorials, will this not be sufficient to appear the exam.

Please do help..as the cost of learning is too high around 50,000 INR.

Hi Gabriel Vince ,

Can you fwd me the working example.....or a link where i can learn from...

Tim Hooloway,

Thank you very much...i have heard about JDBC Realm but i am not finding any tutorial or example for it. I have J2EE Tutorial as well as Complete Reference to JSF2. but i couldn't get any.

I will be very thankful if you let me know the link for JDBC Realm tutorial.

Second concern i have is, as you said Secuirty only deals with authentication , authorization .....so how to deal with session mangement after doing the same....

Please explain me the same...

It would be realy very very helpful.

Tim Holloway,

Can you tell me how to get going with ContainerSecurity in JSF2 + GlassfishServer + Derby Database(bundled with Netbeans)....and also let e know how to maintain session and use it in shopping cart example after authenticating user against ContainerSecurity.