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POStruts 2 Hibernate null pointer exception while submitting the form
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I am trying to create a registration page by integrating Struts 2 & Hibernate. But when I am running the below code , I am getting a null pointer exception when I click the register button. hibernate configuration file: <pre><code><hibernate-configuration> <session-factory> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql://localhost/db_socialnetwork</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">root</property> <mapping resource="hibernate.hbm.xml"/> </session-factory> </hibernate-configuration> </code></pre> <hr> hibernate mapping file: <pre><code><hibernate-mapping> <class name="models.User" table="tbl_user"> //DAO Class <meta attribute="class-description"> This class contains a sample. </meta> <id column="user_id" name="id" type="int"> <generator class="increment"/> </id> <property column="user_name" name="name" type="string"/> <property column="user_pwd" name="pwd" type="string"/> <property column="user_email" name="email" type="string"/> <property column="user_address" name="address" type="string"/> <property column="user_phno" name="phno" type="int"/> </class> </hibernate-mapping> </code></pre> <hr> <code>struts.xml</code>: <pre><code><struts>  <constant name="struts.devMode" value="true" /> <package name="default" extends="struts-default" namespace="/"> <action name="register" class="models.RegisterAction" method="execute"> <result name="success">/home.jsp</result> </action> </package> </struts> </code></pre> <code>web.xml</code>: <pre><code><web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <session-config> <session-timeout> 30 </session-timeout> </session-config> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app> </code></pre> <hr> <code>HibernateUtil</code>: <pre><code>public class HibernateUtil { private static final SessionFactory sessionFactory; static { try { //new SchemaExport(config).create(true,true); sessionFactory = new Configuration().configure().buildSessionFactory(); } catch (Throwable ex) { // Log the exception. System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } } </code></pre> <hr> Registration form: <pre><code><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>JSP Page</title> </head> <body> <s:form action="register"> <s:textfield name="name" label="Name"/> <s:textfield name="pwd" label="Password"/> <s:textfield name="email" label="Email"/> <s:textarea name="address" label="Address"/> <s:textfield name="phno" label="Mobile"/> <s:submit value="Register"/> </s:form> </body> </html> </code></pre> <hr> <code>RegisterAction</code>: <pre><code>public class RegisterAction extends ActionSupport implements ModelDriven<User>{ User u = new User(); UserDao udao = new UserDao(); public RegisterAction() { } public String execute() throws Exception { udao.addUser(u); return "success"; } @Override public User getModel() { throw new UnsupportedOperationException("Not supported yet."); } public User getU() { return u; } public void setU(User u) { this.u = u; } } </code></pre> <hr> <code>User</code> class: <pre><code>public class User { int id, phno; String name, pwd, email, address; public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getPhno() { return phno; } public void setPhno(int phno) { this.phno = phno; } public String getPwd() { return pwd; } public void setPwd(String pwd) { this.pwd = pwd; } } </code></pre> <hr> <code>UserDao</code>: <pre><code>class UserDao { public UserDao() { } public static void addUser(User u) { Session session = HibernateUtil.getSessionFactory().openSession(); Transaction t = session.beginTransaction(); int i = (Integer)session.save(u); t.commit(); session.close(); } } </code></pre> The database consists of the following fields: <ul> <li>id - autogenerated , int , primary key</li> <li>name, </li> <li>pwd, </li> <li>email, </li> <li>address - string,</li> <li>phno - int</li> </ul> <hr> Error being displayed is: <pre><code>INFO: Hibernate 3.2.5 INFO: hibernate.properties not found INFO: Bytecode provider name : cglib INFO: using JDK 1.4 java.sql.Timestamp handling INFO: configuring from resource: /hibernate.cfg.xml INFO: Configuration resource: /hibernate.cfg.xml INFO: Reading mappings from resource : hibernate.hbm.xml SEVERE: Error parsing XML: XML InputStream(17) The content of element type "class" must match "(meta*,subselect?,cache?,synchronize*,comment?,tuplizer*,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array)*,((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*,resultset*,(query|sql-query)*)". SEVERE: Initial SessionFactory creation failed.org.hibernate.InvalidMappingException: Could not parse mapping document from resource hibernate.hbm.xml WARNING: StandardWrapperValve[default]: PWC1406: Servlet.service() for servlet default threw exception org.xml.sax.SAXParseException: The content of element type "class" must match "(meta*,subselect?,cache?,synchronize*,comment?,tuplizer*,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array)*,((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*,resultset*,(query|sql-query)*)". at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:198) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:387) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:321) at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleEndElement(XMLDTDValidator.java:2020) at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.endElement(XMLDTDValidator.java:904) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1750) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2906) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:624) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:116) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:486) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:810) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:740) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:110) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525) at org.dom4j.io.SAXReader.read(SAXReader.java:465) at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:499) at org.hibernate.cfg.Configuration.addResource(Configuration.java:566) at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1587) at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1555) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1534) at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1508) at org.hibernate.cfg.Configuration.configure(Configuration.java:1428) at org.hibernate.cfg.Configuration.configure(Configuration.java:1414) at models.HibernateUtil.<clinit>(HibernateUtil.java:24) at models.RegisterAction.<init>(RegisterAction.java:10) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:539) at java.lang.Class.newInstance0(Class.java:372) at java.lang.Class.newInstance(Class.java:325) at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:119) at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150) at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:139) at com.opensymphony.xwork2.ObjectFactory.buildAction(ObjectFactory.java:109) at com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:288) at com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:388) at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:187) at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:61) at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39) at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:47) at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:478) at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77) at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161) at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231) at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317) at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195) at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860) at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757) at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056) at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229) at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104) at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90) at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79) at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54) at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59) at com.sun.grizzly.ContextTask.run(ContextTask.java:71) at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532) at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513) at java.lang.Thread.run(Thread.java:717) </code></pre>
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<java><hibernate><jsp><struts2><dao>
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Struts 2 Hibernate null pointer exception while submitting the form
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