Sweta Chauhan

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since Jul 09, 2010

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Recent posts by Sweta Chauhan

How to use javax.transaction.Synchronization in java

Hi All,

I am new to Synchronization interface for javax.transaction and there is requirement in my project where I need to use Synchronization interface.I tried to search for example but not able to find full example how to use this class.I have to call beforeCompletion() and afterCompletion(int arg0) method to post messages to kafka queue before and after transaction completion.Please suggest me how could I use synchronization interface and any example will be helpful.

3 years ago

Java in General

Session not working with json-default package

Hi,

I am new to struts2 and I am trying to use session with SessionAware class option in my action class.

In struts.xml file package is set as json-default. But when try to get value from session then null object is returned. I am not very sure the issue is because I am using package json-default that is the or something else. Could you please help me someone if I am missing any thing..

Also wants to know what is difference between package struts-default and json-default.

Regards
Shanta

6 years ago

Struts

Synchronization while file reading

Stephan van Hulst wrote:This seems like a really weird requirement though.

Why should the threads wait for each other? They're not bothering each other by reading concurrently. And if they have to read one at a time, why is this multi-threaded in the first place?

Thanks Stephan for your response.

You are right I think we need to reconsider the requirement.

6 years ago

Java in General

Synchronization while file reading

Hi,

I have worked on java but not in multithreading issue. Currently in my organization there is requirement where file will be read by multiple thread and need to ensure that first thread t3,t2 and t1 will read the file and after that rest of thread could start reading.

I am able to achieve the first scenario with join() method but when thread t4,t5 and t6 start reading file result in not what is expected. for example T4 is not finished with synchronized readFile() method and t5 start executing synchronized readFile() method.

I am sharing my code, could someone help where I am missing.

package test.multithreading;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class ThreadJoinExample {
public static void main(String[] args) {
Thread t1 = new Thread(new MyRunnable(), "t1");
Thread t2 = new Thread(new MyRunnable(), "t2");
Thread t3 = new Thread(new MyRunnable(), "t3");
Thread t4 = new Thread(new MyRunnable(), "t4");
Thread t5 = new Thread(new MyRunnable(), "t5");
Thread t6 = new Thread(new MyRunnable(), "t6");
t3.start();
//start second thread after waiting for 2 seconds or if it's dead
try {
//t1.join(2000);
t3.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
t2.start();
//start third thread only when first thread is dead
try {
t2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
t1.start();
try {
t2.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
//let all threads finish execution before finishing main thread
try {
t1.join();
t2.join();
t3.join();
t4.start();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
t5.start();
t6.start();
System.out.println("All threads are dead, exiting main thread");
}
}
class MyRunnable implements Runnable{
ReadFileF pd;
MyRunnable(){
pd=new ReadFileF();
}
@Override
public void run() {
try {
pd.readFile();
Thread.sleep(4000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
class ReadFileF{
public synchronized void readFile() throws FileNotFoundException {
FileInputStream in = new FileInputStream("E:/test/input.txt");
try {
int c;
boolean valueSet =false;
// synchronized(in){
System.out.println("File Reading started by:::---"+Thread.currentThread().getName());
/* while(valueSet){
try {
in.wait();
} catch(InterruptedException e) {
System.out.println("InterruptedException caught");
}
}*/
while ((c = in.read()) != -1) {
System.out.print((char)c);
}
valueSet=true;
System.out.println("-----");
System.out.println("File Reading ended by:::---"+Thread.currentThread().getName());
// in.notifyAll();
// }
} catch (FileNotFoundException e ) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch(IOException e){
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
if (in != null) {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
// }
}
}

6 years ago

Java in General

Not able to call json action from a submit button in stuts2

Hi All,

I am using struts2 and json gridview in my project. I am able to display the list data in gridview but while try to call json action from sj:a href tag or sj:submit option gridview in not displayed, instead it display the json data in browser.

{"JSON":"success","gridModel":[{"progId":1,"programName":"BASE","projectNames":null,"updateDate":"2012-04-12T22:08:12","updatedBy":null},{"progId":2,"programName":"BASE1" }

.jsp page

stuts.xml

Kidly help to how to display the gridview when I click the submit button.

I have tried different method but no luck.

Thanks in advance..

10 years ago

Struts

use Action with load-on-startup option problem

I am having a requirement to call a Action class as soon as application is started. I have used this is struts1.3 but not able to find how to do this in struts2. Could anyone give me any help on how to do this.

11 years ago

Struts

Calling struts2 action from javascript

Joe Ess wrote:You would invoke it the same way you would invoke any URL. If you just need some information and don't want to reload the page, use the AJAX-style XMLHttpRequest (your action should return XML or JSON). If you want to reload the page, use window.location.

Could you please give me any detail on how to return JSON result.

11 years ago

Struts

Calling struts2 action from javascript

I want to call Struts2 action from javascript function. I have searched Google but not able to find any hints to how to do. If anyone have worked on this then please give me any hints.

11 years ago

Struts

result display error

Ankit Garg wrote:When does the error appear actually?? If it occurs when you enter a URL into the browser, then tell us that URL otherwise if it happens when you submit a form, then please post the code of that form. I think the error appears when you try to list all students as validation happens in that case and since there is no "input" result defined, you get the 404 error message. You'll have to tell struts to skip validation in case of StudentAction.list() method. You can find more info on how to do that here...

Thanks by use of interceptor for list action it work perfectly.

11 years ago

Struts

result display error

Student.java

package admin.model;
import java.io.Serializable;
import admin.model.Course;
import admin.model.Qualification;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.SequenceGenerator;
import javax.persistence.*;
import com.opensymphony.xwork2.validator.annotations.*;
import org.hibernate.validator.Length;
import org.hibernate.validator.Size;
import org.hibernate.validator.NotNull;
import org.hibernate.validator.NotEmpty;
@Entity
@Table(name="Student")
@SecondaryTable(name= "student_course", pkJoinColumns = { @PrimaryKeyJoinColumn(name="STUDENT_ID", referencedColumnName="STUDENT_ID")})
public class Student implements Serializable{
private static final long serialVersionUID = 6295524232169619097L;
@Column(table="student_course")
private String courseName;
private Long id;
private Long studentCode;
private String firstname;
private String middlename;
private String lastname;
private String motherName;
private String fatherName;
private Date dateOfBirth;
private int rollNumber;
private Date year;
private int mobileNumber;
private String contactNumber;
private String address;
private String address1;
private String bloodGroup;
private String modeOfTranspotation;
private Integer regNumber;
private String section;
private String standard;
private String languageSpeak;
private String languageRead;
private String languageWrite;
private String activity;
private String Hobby;
private String email1;
private String email2;
private String courseCode;
private Set<Course> courses = new HashSet<Course>();
private Qualification studentQualification;
@Id
@GeneratedValue
@Column(name="STUDENT_ID")
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
@Column(name="STUDENT_CODE")
public Long getStudentCode() {
return studentCode;
}
public void setStudentCode(Long studentCode) {
this.studentCode = studentCode;
}
@Column(name="FIRST_NAME")
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
@Column(name="MIDDLE_NAME")
public String getMiddlename() {
return middlename;
}
public void setMiddlename(String middlename) {
this.middlename = middlename;
}
@Column(name="LAST_NAME")
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}
@Column(name="MOTHER_NAME")
public String getMotherName() {
return motherName;
}
public void setMotherName(String motherName) {
this.motherName = motherName;
}
@Column(name="FATHER_NAME")
public String getFatherName() {
return fatherName;
}
public void setFatherName(String fatherName) {
this.fatherName = fatherName;
}
/*
public String getGuardianName() {
return guardianName;
}
public void setGuardianName(String guardianName ){
this.guardianName = guardianName;
}*/
@Column(name="DATE_OF_BIRTH")
public Date getDateOfBirth(){
return dateOfBirth;
}
public void setDateOfBirth(Date dateOfBirth) {
this.dateOfBirth = dateOfBirth;
}
@Column(name="ROLLNUMBER")
public int getRollNumber() {
return rollNumber;
}
public void setRollNumber(int rollNumber) {
this.rollNumber = rollNumber;
}
@Column(name="YEAR")
public Date getYear() {
return year;
}
public void setYear(Date year) {
this.year = year;
}
@Column(name="MOBILE_NUMBER")
public int getMobileNumber() {
return mobileNumber;
}
public void setMobileNumber(int mobileNumber) {
this.mobileNumber = mobileNumber;
}
@Column(name="CONTACT_NUMBER")
public String getContactNumber() {
return contactNumber;
}
public void setContactNumber(String contactNumber) {
this.contactNumber = contactNumber;
}
@Column(name="P_ADDRESS")
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Column(name="C_ADDRESS")
public void setAddress1(String address1) {
this.address1 = address1;
}
public String getAddress1() {
return address1;
}
@Column(name="Email_1")
public String getEmail1(){
return email1;
}
public void setEmail1(String email1){
this.email1 = email1;
}
@Column(name="Email_2")
public String getEmail2(){
return email2;
}
public void setEmail2(String email2){
this.email2 = email2;
}
/*
@Column(name="BLOOD_GROUP")
public String getBloodGroup() {
return bloodGroup;
}
public void setBloodGroup(String bloodGroup) {
this.bloodGroup = bloodGroup;
}
@Column(name="MODE_TRANSPORTATION")
public String getModeOfTranspotation(){
return modeOfTranspotation;
}
public void setModeOfTranspotation(String modeOfTranspotation){
this.modeOfTranspotation = modeOfTranspotation;
}
@Column(name="REG_NUMBER")
public Integer getRegNumber(){
return regNumber;
}
public void setRegNumber(Integer regNumber){
this.regNumber = regNumber;
}
@Column(name="SECTION")
public void setSection(String section){
this.section = section;
}
public String getSection(){
return section;
}
@Column(name="STANDARD")
public String getStandard(){
return standard;
}
public void setStandard(String standard){
this.standard = standard;
}
*/
@Column(name="ACTIVITY")
public String getActivity(){
return activity;
}
public void setActivity(String activity){
this.activity = activity;
}
@Column(name="HOBBY")
public String getHobby(){
return Hobby;
}
public void setHobby(String Hobby){
this.Hobby = Hobby;
}
@Column(name="LANGUAGE_SPEAK")
public String getLanguageSpeak(){
return languageSpeak;
}
public void setLanguageSpeak(String languageSpeak){
this.languageSpeak = languageSpeak;
}
@Column(name="LANGUAGE_READ")
public String getLanguagRead(){
return languageRead;
}
public void setLanguagRead(String languageRead){
this.languageRead = languageRead;
}
@Column(name="LANGUAGE_WRITE")
public String getLanguageWrite(){
return languageWrite;
}
public void setLanguageWrite(String languageWrite){
this.languageWrite = languageWrite;
}
@OneToOne(cascade = CascadeType.ALL)
public Qualification getStudentQualification(){
return studentQualification;
}
public void setStudentQualification(Qualification studentQualification){
this.studentQualification = studentQualification;
}
/*
@Id
@GeneratedValue
@Column(name="COURSE_ID")
public long getCourseId() {
return this.courseId;
}
public void setCourseId(long courseId) {
this.courseId = courseId;
}*/
public String getCourseName() {
return this.courseName;
}
public void setCourseName(String courseName) {
this.courseName = courseName;
}
}

11 years ago

Struts

result display error

Ankit Garg wrote:Its hard to guess what the problem is without some more code. Does your action returns "input" result in any way or is there any validation error when you reach this action??

All files are given below:
struts.xml

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="default" extends="hibernate-default, json-default">
<result-types>
<result-type name="tiles" class="org.apache.struts2.views.tiles.TilesResult" />
</result-types>
<action name="*Link" method="{1}" class="com.vaannila.action.LinkAction">
<result name="welcome" type="tiles">welcome</result>
</action>
<action name="register" class="admin.web.UserAction" method="check">
<result name="input">/pages/Login.jsp</result>
<result name="success" type="tiles">welcome</result>
<result name="ERROR" type="redirect">/pages/Login.jsp</result>
</action>
<action name="admissionForm">
<result name="success" type="tiles">admissionTiles</result>
</action>
<action name="admissionAction" class="admin.web.StudentAction" method="add">
<result name="success" type="tiles">welcome</result>
<result name="input" type="tiles">admissionTiles</result>
</action>
<action name="listStudent" class="admin.web.StudentAction" method="list">
<result name="successEmployer" type="tiles">studentListTiles</result>
</action>
<action name="editStudent" class="admin.web.StudentAction" method="edit">
<result name="success">/pages/editStudent.jsp</result>
<result name="input">/pages/editStudent.jsp</result>
</action>
<action name="attendance" class="admin.web.StudentAction" method="list">
<result name="success">/pages/attendenceSheet.jsp</result>
<result name="input">/pages/attendenceSheet.jsp</result>
</action>
<action name="attendancee" class="admin.web.StudentAction" method="list">
<result name="success">/pages/attendenceSheet.jsp</result>
</action>
<action name="attendanceForm" class="admin.web.StudentAttendance">
<result name="input">/pages/attendenceSheet.jsp</result>
<result name="success" type="redirect">/pages/xml.jsp</result>
</action>
<action name="attendanceAction" class="admin.web.StudentAttendance" method="attend">
<result name="success" type="tiles">attendanceListTiles</result>
</action>
<action name="addUser" method="add" class="comm.com.vaannila.web.UserAction">
<result name="input">/register.jsp</result>
<result name="success" type="redirect">listUser</result>
</action>
<action name="listUser" method="list" class="comm.com.vaannila.web.UserAction">
<result name="success">/register.jsp</result>
</action>
<action name="testAction" class="admin.web.check">
<result name="input">/pages/admissionForm.jsp</result>
<result name="success">/pages/result.jsp</result>
</action>
</package>
</struts>

viewStudent.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib uri="/struts-tags" prefix="s"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Registration Page</title>
<s:head />
<style type="text/css">
@import url(../style.css);
</style>
</head>
<body>
<s:if test="studentList.size() > 0">
<div class="content">
<table class="userTable" cellpadding="5px">
<tr class="even">
<th>Name</th>
<th>Date_Of_Birth</th>
<th>Address</th>
<th>Contact Number</th>
<th>Language Known</th>
<th>Edit</th>
<th>Delete</th>
</tr>
<s:iterator value="studentList" status="userStatus">
<tr
class="<s:if test="#userStatus.odd == true ">odd</s:if><s:else>even</s:else>">
<td><s:property value="firstname" /><s:property value="middletname" /><s:property value="lastname" /></td>
<s:hidden value="id" />
<td><s:property value="dateOfBirth"/></td>
<td><s:property value="address"/></td>
<td><s:property value="mobileNumber"/></td>
<td><s:property value="languageSpeak"/></td>
<s:property value="id" />
<s:push value="id">
<td><s:url id="editURL" action="editStudent">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{editURL}">Edit</s:a></td>
<td><s:url id="deleteURL" action="deleteUser">
<s:param name="id" value="%{id}"></s:param>
</s:url> <s:a href="%{deleteURL}">Delete</s:a></td>
</s:push>
</tr>
</s:iterator>
</table>
</div>
</s:if>
</body>
</html>

StudentAction.java

package admin.web;
import java.util.List;
import java.util.ArrayList;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.vaannila.domain.LoginUser;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import org.hibernate.validator.Valid;
import admin.model.Student;
import admin.dao.StudentDAOImpl;
import admin.dao.StudentDAO;
public class StudentAction extends ActionSupport implements ModelDriven<Student>{
private Student students;// = new Student();
private StudentDAOImpl studentDAO = new StudentDAOImpl();
private List<Student> studentList = new ArrayList<Student>();
public Student getModel(){
return students;
}
public String list(){
studentList = studentDAO.listStudent();
System.out.println("Number of student"+studentList.size());
return "successEmployer";
}
public String edit(){
HttpServletRequest request = (HttpServletRequest) ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);
students = studentDAO.listStudentById(Long.parseLong(request.getParameter("id")));
return SUCCESS;
}
public String add(){
studentDAO.saveStudent(students);
return SUCCESS;
}
public String execute()
{
return SUCCESS;
}
public Student getStudents(){
return students;
}
public void setStudents(Student students){
this.students = students;
}
public List<Student> getStudentList(){
return studentList;
}
public void setStudentList(List<Student> studentList){
this.studentList = studentList;
}
}

StudentAction-validation.xml

11 years ago

Struts

result display error

I am trying to display list of data from database in struts2, I have defined the success result but when try to call the action it throw error

I don't have requirement for input result. Any one have faced this kind of problem then please help me out. Why is it so?
Below is the action mapping in struts.xml file

11 years ago

Struts

pre-populating textfield befor form submit in struts2

Hi have a form in which I am generating list of input box dynamically, but I am having the problem when I try to use date value of date picker within the form as hidden a field within the same form.

my jsp page is given below.

<%@ taglib prefix="s" uri="/struts-tags" %>
<%@ taglib prefix="sj" uri="/struts-jquery-tags"%>
<html>
<head>
<sj:head jqueryui="true"/>
</head>
<body>
<s:form action="attendanceForm">
Select Date: <sj:datepicker name="today" appendText="(dd.MM.yy)" displayFormat="dd.MM.yy" yearRange="1980:2000" changeYear="true"/>
<table border="solid 1px">
<tr bgcolor="#F87431">
<th>Student Name</th><th></th><th>Status</th><th>Reason</th><th>Roll Number</th>
</tr>
<s:iterator value="studentList" status="userStatus">
<tr
class="<s:if test="#userStatus.odd == true ">odd</s:if><s:else>even</s:else>">
<td><s:property value="firstname" /><s:property value="middletname" /><s:property value="lastname" /></td>
<s:hidden name="AttandanceList[%{#userStatus.index}].id" value="%{studentList[#userStatus.index].id}"/>
<s:hidden name="AttandanceList[%{#userStatus.index}].today" value="%{today}" />
<td><s:property value="id" value="%{studentList[#userStatus.index].id}" /></td>
<td><s:textfield name="AttandanceList[%{#userStatus.index}].status" /></td>
<td><s:textfield name="AttandanceList[%{#userStatus.index}].reason"/></td>
<td><s:textfield name="AttandanceList[%{#userStatus.index}].reason"/></td>
</tr>
</s:iterator>
</table>
<s:submit>Save</s:submit>
</s:form>
</body>
</html>

I have try to search the solution for the problem but not getting any idea.

11 years ago

Struts

dynamically create attendance sheet in jsp

Lester Burnham wrote:Where does the data come from? Is it in a database already? Or does each employee need to log into the application you're writing to enter their own data?

Sorry for late reply, all employee data will be coming from the Oracle10g data.

11 years ago

JSP

dynamically create attendance sheet in jsp

Hi,
I am working on a project which require to create attendance sheet of all employee within the organisation for each month. I am trying to create a attendance sheet using java.util.Calander class. But not getting the the idea of how to generate sheet dynamically for each month. Could any body give any idea how to start or any other alternate option.

11 years ago

JSP