NullPointerException at the SessionFactory create line.

[Sweta Chauhan]

Hi all,
I am new to Hibernate and trying to do an example application in Srtuts2, hibernate and Oracle 10EX in eclipse. I have kept all required jar files in WEB-INF/lib folder and hibernate.cfg.eml file in src folder. I got NullPointerException when try to call the function which have lines:

 
Configuration cfg = new Configuration();
		cfg.configure("hibernate.cfg.xml");
		sessionFactory = cfg.buildSessionFactory();
		session =sessionFactory.openSession();

Any response will be great help for me, I am stuck here for last 4-5 days.

Stacktraces is as follows:
java.lang.NullPointerException
org.hns.user.dao.UserHibDao.insert(UserHibDao.java:106)
net.roseindia.Login.execute(Login.java:65)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:441)
com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:280)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:243)
com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:165)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:252)
org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:122)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:195)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:179)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:89)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:130)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:126)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:138)
com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:87)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:165)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:179)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:176)
com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:237)
org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488)
org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
java.lang.Thread.run(Unknown Source)

[Raza Mohd]

can you post code where you are inserting your object?

[Sweta Chauhan]

This is my file where I am trying to create session and insert value in database

   

UserHibDao.java

package org.hns.user.dao;

import java.util.List;
import java.io.*;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hns.user.User;
import org.hns.plugin.HibernateUtil;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class UserHibDao {

private List<User> userlist;
private User user;


public static boolean insert(User usr) {
	boolean flag=false;
//Session session = HibernateUtil.getSessionFactory().getCurrentSession();
//Session session = HibernateUtil.getSessionFactory().openSession();
Session session = null;
 final SessionFactory sessionFactory ;
	try
	{
		Configuration cfg = new Configuration();
		cfg.configure("hibernate.cfg.xml");
		sessionFactory = cfg.buildSessionFactory();
		session =sessionFactory.openSession();
		Transaction tx=null;
		tx = session.beginTransaction();System.out.println("Creating New Contact detail.");
		session.save(usr);
		tx.commit();
		
		flag=true;
		System.out.println("Value of flag" + flag);
		
	} catch (RuntimeException e) {

	System.out.println("Before Stack tack");
	System.out.println(e.getMessage());
} finally {
	if(session == null){
		System.out.println("Session is null");
	}
	session.close();
}
return flag;
}

}

hibernate.cf.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
      <property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
      <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
      <property name="hibernate.connection.username">system</property>
      <property name="hibernate.connection.password">sys123</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="show_sql">true</property>
      <property name="dialect">org.hibernate.dialect.OracleDialect</property>
      <property name="hibernate.hbm2ddl.auto">create</property>
      <!-- Mapping files -->
      <mapping resource="org/hns/user/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>


Login.java

package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import org.hns.user.User;
import org.hns.user.dao.UserHibDao;
import java.io.*;

public  class Login{

	//private int id;

	private String username;

	private String password;

	private String usertype;
	
/*	public int getId()
	{
		return id;
	}
	
	public void setId(int id){
		this.id = id;
	}
	*/
	public String getUsername()
	{
		return username;
	}
	
	public void setUsername(String username)
	{
		this.username = username;
	}
	
	public String getPassword()
	{
		return password;
	}
	
	public void setPassword(String password){
		this.password = password;
	}
	
	public String getUsertype()
	{
		return usertype;
	}
	
	public void setUsertype(String usertype){
		this.usertype = usertype;
	}
	
    public String execute() throws Exception {
    	
    	
    		User usr = new User();
        	usr.setUsername(username);
        	usr.setPassword(password);
        	usr.setUsertype(usertype);
        	if(UserHibDao.insert(usr))// Access persistence tier through DAO
        	{
        		
        		return "success";
        	}
                
           else
               return "fail";
    	    	
    	
    	
    }
}

[Raza Mohd]

Are you extending you class to ActionSupport?

[Paul Sturrock]

Raza Mohd wrote:Are you extending you class to ActionSupport?

No. At least the code above isn't.

What line is line 106?

[Sweta Chauhan]

Raza Mohd wrote:Are you extending you class to ActionSupport?

yes, but getting the same error.

[Sweta Chauhan]

Paul Sturrock wrote:

Raza Mohd wrote:Are you extending you class to ActionSupport?

No. At least the code above isn't.

What line is line 106?

yes, that is the auto generate field in the table, right now it's commented.

[Raza Mohd]

You are setting nothing in User Object

See your code first.

[Sweta Chauhan]

Raza Mohd wrote:You are setting nothing in User Object

See your code first.

I setting the values of User Object withing execute method of the Login.java class.

[Raza Mohd]

  User usr = new User();  
            usr.setUsername(username);  
            usr.setPassword(password);  
            usr.setUsertype(usertype);     

where are you getting this parameter :

username
password
usertype

[Paul Sturrock]

yes, that is the auto generate field in the table, right now it's commented.

I don't understand. You can't comment out the ID property of an object then try to persist it. That just won't work.

[Sweta Chauhan]

Raza Mohd wrote:

  User usr = new User();  
            usr.setUsername(username);  
            usr.setPassword(password);  
            usr.setUsertype(usertype);     

where are you getting this parameter :

username
password
usertype

These value I am getting from the action Form file login.jsp

 
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Struts 2 Login Application!</title>

<link href="<s:url value="/css/main.css"/>" rel="stylesheet" type="text/css"/>

</head>
<body>
<s:form action="register" method="POST">
<tr>
<td >
Login
</td>

</tr>

  <tr>
   <td >
         <s:actionerror/>
         <s:fielderror/>
   </td>
  </tr>

<s:textfield name="username" label="Login name"/>
<s:textfield name="usertype" label="Login name"/>
<s:password name="password" label="Password"/>
<s:submit value="Login" align="center"/>

</s:form>

</body>

</html>

For that I have a mapping in strus.xml file.


Thanks for the reply

[Paul Sturrock]

Raza Mohd wrote:

  User usr = new User();  
            usr.setUsername(username);  
            usr.setPassword(password);  
            usr.setUsertype(usertype);     

where are you getting this parameter :

username
password
usertype

This would not cause a NullPointerException. At worst you might see SQLExceptions if any of the se properties are not nullable.

[Raza Mohd]

what version of struts you are using?
and kindly show your hbm.xml.

[Sweta Chauhan]

Paul Sturrock wrote:

Raza Mohd wrote:

  User usr = new User();  
            usr.setUsername(username);  
            usr.setPassword(password);  
            usr.setUsertype(usertype);     

where are you getting this parameter :

username
password
usertype

This would not cause a NullPointerException. At worst you might see SQLExceptions if any of the se properties are not nullable.

I have try to hardcode the these value, but problem is same.

Thanks for reply

[Paul Sturrock]

Raza Mohd wrote:what version of struts you are using?
and kindly show your hbm.xml.

I'm not sure I follow your reasoning here, this too will not cause the NullPointerException?

[Raza Mohd]

this is not the right way in struts 2 to get values from jsp

use getUserName() in place of username.

[Sweta Chauhan]

Raza Mohd wrote:what version of struts you are using?
and kindly show your hbm.xml.

I am using struts-2.1.8.1.war, hibernate-distribution-3.3.1.GA-dist

User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="org.hns.user.User" table="STUDENT">
	<id name="id" type="integer" column="USER_ID">
		<generator class="native"></generator>
	</id>
	
	<property name="username" type="string" column="USER_NAME"/>
	<property name="password" type="string" column="USER_PASSWORD"/>
	<property name="usertype" type="string" column="USER_TYPE"/>
</class>
</hibernate-mapping>

[Sweta Chauhan]

Raza Mohd wrote:this is not the right way in struts 2 to get values from jsp

use getUserName() in place of username.

In place of usename, I tried to hardcode the value also there, but the problem exist.

[Paul Sturrock]

Simple Chauhan wrote:

Raza Mohd wrote:this is not the right way in struts 2 to get values from jsp

use getUserName() in place of username.

In place of usename, I tried to hardcode the value also there, but the problem exist.

This is because whether or not the username has been successfully set is not the cause of your problem - Raza is sending you on a tangent. Can you post the code at line 106 of UserHibDao please?

[Sweta Chauhan]

Paul Sturrock wrote:

Simple Chauhan wrote:

Raza Mohd wrote:this is not the right way in struts 2 to get values from jsp

use getUserName() in place of username.

In place of usename, I tried to hardcode the value also there, but the problem exist.

This is because whether or not the username has been successfully set is not the cause of your problem - Raza is sending you on a tangent. Can you post the code at line 106 of UserHibDao please?

I have changed the coding and getting the same error

Struts Problem Report
Struts has detected an unhandled exception:

Messages:
File: org/hns/user/dao/UserHibDao.java
Line number: 46


--------------------------------------------------------------------------------

Stacktraces
java.lang.NullPointerException
org.hns.user.dao.UserHibDao.insert(UserHibDao.java:46)
net.roseindia.Login.execute(Login.java:54)

This in the code for file UserHibDao.java

package org.hns.user.dao;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hns.user.User;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class UserHibDao {


public static boolean insert() {
	boolean flag=false;
	
	
//Session session = HibernateUtil.getSessionFactory().getCurrentSession();
//Session session = HibernateUtil.getSessionFactory().openSession();
Session session = null;
 final SessionFactory sessionFactory ;
	try
	{
		Configuration cfg = new Configuration();
		User user = new User();
		user.setUsername("Panky");
    	user.setPassword("Panky");
    	user.setUsertype("Admin");
		cfg.configure("hibernate.cfg.xml");
		sessionFactory = cfg.buildSessionFactory();
		session =sessionFactory.openSession();
		Transaction tx=null;
		tx = session.beginTransaction();System.out.println("Creating New Contact detail.");
		session.save(user);
		tx.commit();
		
		flag=true;
		System.out.println("Value of flag" + flag);
		
	} catch (RuntimeException e) {

	System.out.println("Before Stack tack");
	System.out.println(e.getMessage());
} finally {
	if(session == null){
		System.out.println("Session is null");
	}
	session.close();
}
return flag;
}

}

[Raza Mohd]

@Paul Actually i found these uncorrect so try to ask it.
i know the problem can be resolved with SqlExceptions.

[Paul Sturrock]

If the line numbers are correct, the it is your session.close() method that is the issue. If you don't have a session you will certainly have messages further up your server log that tells you what may have gone wrong configuring your SessionFactory. What do they say?

[Sweta Chauhan]

Paul Sturrock wrote:If the line numbers are correct, the it is your session.close() method that is the issue. If you don't have a session you will certainly have messages further up your server log that tells you what may have gone wrong configuring your SessionFactory. What do they say?

If I am not wrong then SessionFactory establish connection between Hibernate and database, so you mean to say there may be configuration problem in hibernate.cfg.xml file. This is the file

 

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
      <property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
      <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
      <property name="hibernate.connection.username">system</property>
      <property name="hibernate.connection.password">sys123</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="show_sql">true</property>
      <property name="dialect">org.hibernate.dialect.OracleDialect</property>
      <property name="hibernate.hbm2ddl.auto">create</property>
      <!-- Mapping files -->
      <mapping resource="org/hns/user/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>

Thanks for quick reply

[Paul Sturrock]

That looks OK. Can you post User.hbm.xml and User.java, and much more importantly what messages are there in the server log from when you configured the SessionFactory?

[Sweta Chauhan]

Paul Sturrock wrote:That looks OK. Can you post User.hbm.xml and User.java, and much more importantly what messages are there in the server log from when you configured the SessionFactory?

 
User.java

package org.hns.user;


public class User
{

private int id;

private String username;

private String password;

private String usertype;

public User()
{
}

public int getId()
{
	return id;
}

public void setId(int id)
{
	this.id = id;
}

public String getUsername()
{
	return username;
}

public void setUsername(String username)
{
	this.username = username;
}

public String getPassword()
{
	return password;
}

public void setPassword(String password)
{
	this.password = password;
}

public String getUsertype()
{
	return usertype;
}

public void setUsertype(String usertype)
{
	this.usertype = usertype;
}

}


User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="org.hns.user.User" table="STUDENT">
	<id name="id" type="integer" column="USER_ID">
		<generator class="native"></generator>
	</id>
	
	<property name="username" type="string" column="USER_NAME"/>
	<property name="password" type="string" column="USER_PASSWORD"/>
	<property name="usertype" type="string" column="USER_TYPE"/>
</class>
</hibernate-mapping>

[Sweta Chauhan]

Paul Sturrock wrote:That looks OK. Can you post User.hbm.xml and User.java, and much more importantly what messages are there in the server log from when you configured the SessionFactory?

Sorry, I forgot to post log error:

!SUBENTRY 1 org.eclipse.core.filesystem 4 272 2010-07-09 15:19:53.224
!MESSAGE Could not write file: D:\ECLIPSE\work\.metadata\.plugins\org.eclipse.debug.core\.launches\WEB-INF\classes\org\hns\user\dao.

!ENTRY org.eclipse.jdt.ui 2 0 2010-07-09 15:46:15.506
!MESSAGE The 'org.eclipse.mylyn.java.ui.javaAllCompletionProposalComputer' proposal computer from the 'org.eclipse.mylyn.java.ui' plug-in did not complete normally. The extension took too long to return from the 'computeCompletionProposals()' operation.

!ENTRY org.eclipse.jdt.ui 2 0 2010-07-09 15:46:30.787
!MESSAGE The 'org.eclipse.mylyn.java.ui.javaAllCompletionProposalComputer' proposal computer from the 'org.eclipse.mylyn.java.ui' plug-in did not complete normally. The extension took too long to return from the 'computeCompletionProposals()' operation.

!ENTRY org.eclipse.jdt.ui 2 0 2010-07-09 15:47:18.006
!MESSAGE The 'org.eclipse.mylyn.java.ui.javaAllCompletionProposalComputer' proposal computer from the 'org.eclipse.mylyn.java.ui' plug-in did not complete normally. The extension took too long to return from the 'computeCompletionProposals()' operation.

!ENTRY org.eclipse.jst.jsp.core 2 2 2010-07-09 16:14:30.474
!MESSAGE Taglib Index ZipException: D:/ECLIPSE/work/StudentManagmentSystem/src/hibernate.cfg.xml error in opening zip file

!ENTRY org.eclipse.jst.jsp.core 2 2 2010-07-09 16:14:30.490
!MESSAGE Taglib Index ZipException: D:/ECLIPSE/work/StudentManagmentSystem/src/org/hns/user/User.hbm.xml error in opening zip file

!ENTRY org.eclipse.jface 4 0 2010-07-09 16:14:52.521
!MESSAGE The command ("org.eclipse.wst.sse.ui.show.javadoc") is undefined
!STACK 0
java.lang.Exception
at org.eclipse.jface.action.ExternalActionManager$CommandCallback.isActive(ExternalActionManager.java:370)
at org.eclipse.jface.action.ActionContributionItem.isCommandActive(ActionContributionItem.java:647)
at org.eclipse.jface.action.ActionContributionItem.isVisible(ActionContributionItem.java:703)
at org.eclipse.jface.action.SubContributionItem.isVisible(SubContributionItem.java:136)
at org.eclipse.jface.action.MenuManager.isChildVisible(MenuManager.java:985)
at org.eclipse.jface.action.MenuManager.update(MenuManager.java:759)
at org.eclipse.jface.action.MenuManager.update(MenuManager.java:678)
at org.eclipse.ui.internal.menus.WorkbenchMenuService.updateManagers(WorkbenchMenuService.java:325)
at org.eclipse.ui.internal.menus.WorkbenchMenuService$4.propertyChange(WorkbenchMenuService.java:303)
at org.eclipse.ui.internal.services.EvaluationAuthority$1.run(EvaluationAuthority.java:252)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.internal.services.EvaluationAuthority.fireServiceChange(EvaluationAuthority.java:246)
at org.eclipse.ui.internal.services.EvaluationAuthority.endSourceChange(EvaluationAuthority.java:197)
at org.eclipse.ui.internal.services.EvaluationAuthority.sourceChanged(EvaluationAuthority.java:135)
at org.eclipse.ui.internal.services.ExpressionAuthority.sourceChanged(ExpressionAuthority.java:311)
at org.eclipse.ui.internal.services.ExpressionAuthority.sourceChanged(ExpressionAuthority.java:290)
at org.eclipse.ui.AbstractSourceProvider.fireSourceChanged(AbstractSourceProvider.java:99)
at org.eclipse.ui.internal.contexts.ActiveContextSourceProvider.contextManagerChanged(ActiveContextSourceProvider.java:57)
at org.eclipse.core.commands.contexts.ContextManager.fireContextManagerChanged(ContextManager.java:165)
at org.eclipse.core.commands.contexts.ContextManager.setEventCaching(ContextManager.java:324)
at org.eclipse.core.commands.contexts.ContextManager.deferUpdates(ContextManager.java:83)
at org.eclipse.ui.internal.contexts.ContextAuthority.sourceChanged(ContextAuthority.java:673)
at org.eclipse.ui.internal.services.ExpressionAuthority.sourceChanged(ExpressionAuthority.java:310)
at org.eclipse.ui.internal.services.ExpressionAuthority.sourceChanged(ExpressionAuthority.java:290)
at org.eclipse.ui.AbstractSourceProvider.fireSourceChanged(AbstractSourceProvider.java:99)
at org.eclipse.ui.internal.services.WorkbenchSourceProvider.checkActivePart(WorkbenchSourceProvider.java:411)
at org.eclipse.ui.internal.services.WorkbenchSourceProvider.checkActivePart(WorkbenchSourceProvider.java:301)
at org.eclipse.ui.internal.services.WorkbenchSourceProvider$1.partDeactivated(WorkbenchSourceProvider.java:248)
at org.eclipse.ui.internal.PartListenerList$4.run(PartListenerList.java:117)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.PartListenerList.fireEvent(PartListenerList.java:57)
at org.eclipse.ui.internal.PartListenerList.firePartDeactivated(PartListenerList.java:115)
at org.eclipse.ui.internal.PartService.firePartDeactivated(PartService.java:238)
at org.eclipse.ui.internal.PartService.setActivePart(PartService.java:300)
at org.eclipse.ui.internal.WWinPartService.updateActivePart(WWinPartService.java:131)
at org.eclipse.ui.internal.WWinPartService.access$0(WWinPartService.java:122)
at org.eclipse.ui.internal.WWinPartService$WWinListener.partDeactivated(WWinPartService.java:50)
at org.eclipse.ui.internal.PartListenerList2$4.run(PartListenerList2.java:115)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.PartListenerList2.fireEvent(PartListenerList2.java:55)
at org.eclipse.ui.internal.PartListenerList2.firePartDeactivated(PartListenerList2.java:113)
at org.eclipse.ui.internal.PartService.firePartDeactivated(PartService.java:242)
at org.eclipse.ui.internal.PartService.setActivePart(PartService.java:300)
at org.eclipse.ui.internal.WorkbenchPagePartList.fireActivePartChanged(WorkbenchPagePartList.java:57)
at org.eclipse.ui.internal.PartList.setActivePart(PartList.java:136)
at org.eclipse.ui.internal.WorkbenchPage.setActivePart(WorkbenchPage.java:3531)
at org.eclipse.ui.internal.WorkbenchPage.activate(WorkbenchPage.java:614)
at org.eclipse.ui.internal.WorkbenchPage.showEditor(WorkbenchPage.java:2943)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2843)
at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2762)
at org.eclipse.ui.internal.WorkbenchPage.access$11(WorkbenchPage.java:2754)
at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2705)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2701)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2685)
at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2676)
at org.eclipse.ui.ide.IDE.openEditor(IDE.java:651)
at org.eclipse.ui.ide.IDE.openEditor(IDE.java:610)
at org.eclipse.ui.actions.OpenFileAction.openFile(OpenFileAction.java:99)
at org.eclipse.ui.actions.OpenSystemEditorAction.run(OpenSystemEditorAction.java:99)
at org.eclipse.ui.views.navigator.OpenActionGroup.runDefaultAction(OpenActionGroup.java:133)
at org.eclipse.ui.views.navigator.MainActionGroup.runDefaultAction(MainActionGroup.java:330)
at org.eclipse.ui.views.navigator.ResourceNavigator.handleOpen(ResourceNavigator.java:787)
at org.eclipse.ui.views.navigator.ResourceNavigator$6.open(ResourceNavigator.java:499)
at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.open(OpenAndLinkWithEditorHelper.java:48)
at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:842)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.core.runtime.Platform.run(Platform.java:888)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:48)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175)
at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:840)
at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1101)
at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1205)
at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:264)
at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:258)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:298)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3880)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3473)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2405)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2369)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2221)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:500)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:493)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:194)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

[Paul Sturrock]

That looks like the eclipse log. What about your servlet container's log file? That's where messages from you servlet application will be going.

One thing I notice, the package declaration in you class and the mapping file is different.

[Gaurav Sainii]

Try placing a session.flush(); exactly after applying session.save().

Hopefully it will solve your problem.

[Sweta Chauhan]

Paul Sturrock wrote:That looks like the eclipse log. What about your servlet container's log file? That's where messages from you servlet application will be going.

One thing I notice, the package declaration in you class and the mapping file is different.

sorry to ask, but where I could find servlet container's log file?

[Sweta Chauhan]

Gaurav SuperCoder wrote:Try placing a session.flush(); exactly after applying session.save().

Hopefully it will solve your problem.

Thanks,
but no use.

[Paul Sturrock]

Gaurav SuperCoder wrote:Try placing a session.flush(); exactly after applying session.save().

Hopefully it will solve your problem.

Nope. Nothing to do with the problem. If the NullPointerException is occuring because the session is null this will just shift where the exception occurs.

[Paul Sturrock]

Simple Chauhan wrote:

Paul Sturrock wrote:That looks like the eclipse log. What about your servlet container's log file? That's where messages from you servlet application will be going.

One thing I notice, the package declaration in you class and the mapping file is different.

sorry to ask, but where I could find servlet container's log file?

What servlet container are you using?

[Sweta Chauhan]

Paul Sturrock wrote:

Simple Chauhan wrote:

Paul Sturrock wrote:That looks like the eclipse log. What about your servlet container's log file? That's where messages from you servlet application will be going.

One thing I notice, the package declaration in you class and the mapping file is different.

sorry to ask, but where I could find servlet container's log file?

What servlet container are you using?

Tomcat, one more thing you are asking about package declaration in which class file, that may be helpful for me.

Thanks for the quick reply

[Paul Sturrock]

Just in the logs folder of your Tomcat installation.

one more thing you are asking about package declaration in which class file, that may be helpful for me

Ignore me. I'm misreading your code.

[Sweta Chauhan]

Paul Sturrock wrote:Just in the logs folder of your Tomcat installation.

one more thing you are asking about package declaration in which class file, that may be helpful for me

Ignore me. I'm misreading your code.

There is no error

[Paul Sturrock]

OK, so that means it's (probably) not the session.close() line. Looking again at your code, a NullPointerException is in fact not possible on that line (without a warning message). Can you post the code you are actually running?

[Sweta Chauhan]

Paul Sturrock wrote:OK, so that means it's (probably) not the session.close() line. Looking again at your code, a NullPointerException is in fact not possible on that line. Can you post the code you are actually running?

***********Login.java*********************

package net.roseindia;
import com.opensymphony.xwork2.ActionSupport;
import org.hns.user.User;
import org.hns.user.dao.UserHibDao;
import java.io.*;

public  class Login extends ActionSupport{

	//private int id;

	private String username;

	private String password;

	private String usertype;
	

	public String getUsername()
	{
		return username;
	}
	
	public void setUsername(String username)
	{
		this.username = username;
	}
	
	public String getPassword()
	{
		return password;
	}
	
	public void setPassword(String password){
		this.password = password;
	}
	
	public String getUsertype()
	{
		return usertype;
	}
	
	public void setUsertype(String usertype){
		this.usertype = usertype;
	}
	
    public String execute() throws Exception {
    
    	//User usr = new User();
    	//usr.setUsername(getUsername());
    	///usr.setPassword(getPassword());
    	//usr.setUsertype(getUsertype());
      	
    		
        	if(UserHibDao.insert())// Access persistence tier through DAO
        	{
        		
        		return "success";
        	}
                
           else
               return "fail";
    	    	
    	
    	
    }
}

***************UserHibDao.java*********************
package org.hns.user.dao;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hns.user.User;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.HibernateException;
public class UserHibDao {


public static boolean insert() {
	boolean flag=false;
	
	
//Session session = HibernateUtil.getSessionFactory().getCurrentSession();
//Session session = HibernateUtil.getSessionFactory().openSession();
Session session = null;
SessionFactory sessFact = null;

	try
	{
		
		sessFact=new Configuration().configure().buildSessionFactory();
		session=sessFact.openSession();
		
		Transaction tr = session.beginTransaction();
		
		//Configuration cfg = new Configuration();
		User user = new User();
		user.setUsername("Panky");
    	user.setPassword("Panky");
    	user.setUsertype("Admin");
	//	cfg.configure("hibernate.cfg.xml");
	//	sessionFactory = cfg.buildSessionFactory();
	//	session =sessionFactory.openSession();
	//	Transaction tx=null;
    	session.save(user);
	//	tx = session.beginTransaction();System.out.println("Creating New Contact detail.");
    	session.flush();
		
		tr.commit();
		
		flag=true;
		System.out.println("Value of flag" + flag);
		
	} catch (HibernateException e) {

	System.out.println("Before Stack tack");
	System.out.println(e.getMessage());
} finally {
	if(session == null){
		System.out.println("Session is null");
	}
	session.close();
}
return flag;
}

}

****************User.hbm.xml************************
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="org.hns.user.User" table="STUDENT">
	<id name="id" type="int" column="USER_ID">
		<generator class="native"></generator>
	</id>
	
	<property name="username" type="java.lang.String" column="USER_NAME"/>
	<property name="password" type="java.lang.String" column="USER_PASSWORD"/>
	<property name="usertype" type="java.lang.String" column="USER_TYPE"/>
</class>
</hibernate-mapping>

**********************User.java******************
package org.hns.user;


public class User
{

private int id;

private String username;

private String password;

private String usertype;

public User()
{
}

public int getId()
{
	return id;
}

public void setId(int id)
{
	this.id = id;
}

public String getUsername()
{
	return username;
}

public void setUsername(String username)
{
	this.username = username;
}

public String getPassword()
{
	return password;
}

public void setPassword(String password)
{
	this.password = password;
}

public String getUsertype()
{
	return usertype;
}

public void setUsertype(String usertype)
{
	this.usertype = usertype;
}

}

**********************hibernate.cfg.xml**********************
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
      <property name="hibernate.connection.driver_class">oracle.jdbc.OracleDriver</property>
      <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
      <property name="hibernate.connection.username">system</property>
      <property name="hibernate.connection.password">sys123</property>
      <property name="hibernate.connection.pool_size">10</property>
      <property name="show_sql">true</property>
      <property name="dialect">org.hibernate.dialect.OracleDialect</property>
      <property name="hibernate.hbm2ddl.auto">create</property>
      <!-- Mapping files -->
      <mapping resource="org/hns/user/User.hbm.xml"/>
</session-factory>
</hibernate-configuration>

**************struts.xml********************
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />

    <package name="roseindia" namespace="/roseindia" extends="struts-default">

		<!-- Login Form Configuration -->
        <action name="showLogin">
			<result>/pages/login.jsp</result>
        </action>

        <action name="doLogin" class="net.roseindia.Login">
            <result  name="input">/pages/login.jsp</result>
			<result  name="error">/pages/login.jsp</result>
			<result>/pages/loginsuccess.jsp</result>
        </action>
	
         <action  name="register" class="net.roseindia.Login">
            <result name="success">/pages/loginsuccess.jsp</result>
            <result name="fail">/pages/login.jsp</result>
        </action>
    </package>


    <!-- Add packages here -->

</struts>

*********************login.jsp*****************
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Struts 2 Login Application!</title>

<link href="<s:url value="/css/main.css"/>" rel="stylesheet" type="text/css"/>

</head>
<body>
<s:form action="register" method="POST">
<tr>
<td >
Login
</td>

</tr>

  <tr>
   <td >
         <s:actionerror/>
         <s:fielderror/>
   </td>
  </tr>

<s:textfield name="username" label="Login name"/>
<s:textfield name="usertype" label="Login name"/>
<s:password name="password" label="Password"/>
<s:submit value="Login" align="center"/>

</s:form>

</body>

</html>

******************loginsuccess.jsp***********************
html>
<head>

<title>Login Success</title>

</head>

<body>

<p ><font color="#000080" size="5">Login Successful</font></p>

</body>

</html>

These are the files which I am using

[Paul Sturrock]

...adn what happens on line 46 of UserHibDao?

[Sweta Chauhan]

Paul Sturrock wrote:...adn what happens on line 46 of UserHibDao?

There is blank line on line number 46