java - NullPointerException exception on file uploading in struts2 -
i working on struts2 application have upload file , save database. each time showing nullpointerexception code here
stack trace is-
java.lang.nullpointerexception dao.clientdao.registration(clientdao.java:31) action.client.clientaction.execute(clientaction.java:18) 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:452) com.opensymphony.xwork2.defaultactioninvocation.invokeactiononly(defaultactioninvocation.java:291) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:254) com.opensymphony.xwork2.interceptor.defaultworkflowinterceptor.dointercept(defaultworkflowinterceptor.java:176) com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept(methodfilterinterceptor.java:98) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:248) com.opensymphony.xwork2.validator.validationinterceptor.dointercept(validationinterceptor.java:263) org.apache.struts2.interceptor.validation.annotationvalidationinterceptor.dointercept(annotationvalidationinterceptor.java:68) com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept(methodfilterinterceptor.java:98) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:248) com.opensymphony.xwork2.interceptor.parametersinterceptor.dointercept(parametersinterceptor.java:207) com.opensymphony.xwork2.interceptor.methodfilterinterceptor.intercept(methodfilterinterceptor.java:98) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:248) org.apache.struts2.interceptor.fileuploadinterceptor.intercept(fileuploadinterceptor.java:314) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:248) com.opensymphony.xwork2.interceptor.i18ninterceptor.intercept(i18ninterceptor.java:176) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:248) com.opensymphony.xwork2.interceptor.exceptionmappinginterceptor.intercept(exceptionmappinginterceptor.java:187) com.opensymphony.xwork2.defaultactioninvocation.invoke(defaultactioninvocation.java:248) org.apache.struts2.impl.strutsactionproxy.execute(strutsactionproxy.java:52) org.apache.struts2.dispatcher.dispatcher.serviceaction(dispatcher.java:485) org.apache.struts2.dispatcher.ng.executeoperations.executeaction(executeoperations.java:77) org.apache.struts2.dispatcher.ng.filter.strutsprepareandexecutefilter.dofilter(strutsprepareandexecutefilter.java:91) model class is
import java.io.file; public class clientmodel { private string aggrement; private string date; private string rate; private string maturitydate; private string detail; private string taxno; private file imagefile; public file getimagefile() { return imagefile; } public void setimagefile(file imagefile) { this.imagefile = imagefile; } public string getrate() { return rate; } public void setrate(string rate) { this.rate = rate; } public string getdetail() { return detail; } public void setdetail(string detail) { this.detail = detail; } public string gettaxno() { return taxno; } public void settaxno(string taxno) { this.taxno = taxno; } public string getaggrement() { return aggrement; } public void setaggrement(string aggrement) { aggrement = aggrement; } public string getmaturitydate() { return maturitydate; } public void setmaturitydate(string maturitydate) { this.maturitydate = maturitydate; } public string getdate() { return date; } public void setdate(string date) { this.date = date; } } struts.xml
<?xml version="1.0" encoding="utf-8" ?> <!doctype struts public "-//apache software foundation//dtd struts configuration 2.3//en" "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts> <constant name="struts.enable.dynamicmethodinvocation" value="true"/> <constant name="struts.devmode" value="true"/> <package name="loginmodel" extends ="struts-default"> <action name="clientlogin" class="action.client.clientaction" > <interceptor-ref name="exception"/> <interceptor-ref name="i18n"/> <interceptor-ref name="fileupload"> <param name="allowedtypes">text/plain</param> <param name="maximumsize">10240</param> </interceptor-ref> <interceptor-ref name="params"> <param name="excludeparams">dojo\..*,^struts\..*</param> </interceptor-ref> <interceptor-ref name="validation"> <param name="excludemethods">input,back,cancel,browse</param> </interceptor-ref> <interceptor-ref name="workflow"> <param name="excludemethods">input,back,cancel,browse</param> </interceptor-ref> <result name="input">/registration/clientregistration.jsp </result> <result name ="success">/registration/success.jsp </result> </action> </package> </struts> clientregistration.jsp
<%@ page language ="java" contenttype ="text/html; charset=iso-8859-1" pageencoding ="iso-8859-1"%> <%@ taglib uri ="/struts-tags" prefix="s"%> <%@ taglib uri ="/struts-dojo-tags" prefix="sx" %> <%@ taglib prefix="sj" uri="/struts-jquery-tags"%> <html> <head> <sj:head jqueryui="true" jquerytheme="redmond" /> <style> div.ui-datepicker { font-size: 82.5%; } </style> <meta http-equiv="content-type" content="text/html; charset=iso-8859-1"> <title>client</title> <link rel="stylesheet" type="text/css" href="css/emp.css"> </head> <body > <div id ="did" align="center"> <h1 style="color: red"> client registration form</h1> <s:form action ="clientlogin" method="post" enctype="multipart/form-data"> <s:select name="aggrement" label ="type of aggrement" list ="{'oral', 'written'} "/> <sj:datepicker name="date" label="aggrement date" changemonth="true" changeyear="true"/> <s:select name ="rate" list="{'1','2','3'}" label ="aggrement rate"/> <s:textarea name ="detail" label ="aggrement detail"></s:textarea> <s:textfield name ="taxno" label="tax no "></s:textfield> <s:file name ="imagefile" label ="upload document" /> <tr><td> </td></tr> <tr> <td> </td> <s:submit align="center"></s:submit> </s:form> </div> </body> </html> client dao is
package dao; import java.sql.blob; import java.sql.sqlexception; import model.clientmodel; import com.mysql.jdbc.preparedstatement; import com.mysql.jdbc.resultset; public class clientdao { java.sql.connection connection =null; preparedstatement pst = null; resultset rs =null; private java.sql.connection getconnection() throws sqlexception{ java.sql.connection conn; conn = connectionfactory.getinstance().getconntection(); return conn; } public int registration(clientmodel model){ int i= 0; try{ string str = "insert " + "clientdata(aggrement,aggrementdate,rate,maturitydate,detail,taxno,image)"+ "values(?,?,?,?,?,?)"; connection =getconnection(); pst =(preparedstatement) connection.preparestatement(str); pst.setstring(1, model.getaggrement()); pst.setstring(2, model.getdate()); pst.setstring(3, model.getrate()); pst.setstring(4, model.getmaturitydate()); pst.setstring(5, model.getdetail()); pst.setstring(6, model.gettaxno()); pst.setblob(7,(blob) model.getimagefile()); = pst.executeupdate(); system.out.println("result " +i); } catch (sqlexception se){ se.printstacktrace(); } return i; } }
implement modeldriven interface , return object of overridden method model class in action class .
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