Database connectivity in struts with mysql

Question

Hi,
I want to database connectivity in struts with mysql in struts-config.xml file. I have give the code in struts-config.xml file is given below...................
<data-sources>
<data-source key="dbname" type="org.apache.commons.dbcp.BasicDataSource" >
<set-property property="driverClassName" value="com.mysql.jdbc.Driver" />
<set-property property="url" value="jdbc:mysql://localhost:3306/antrowinnovation" />
<!-- <set-property property="username" value=""/>
<set-property property="password" value="indra" /> -->
</data-source>
</data-sources>
And give the code in Action class is given below...
     int i=0;
     Connection con;
     Statement stmt;
          DataSource dataSource = (DataSource)servlet.getServletContext().getAttribute("dbname");
          System.out.println(dataSource);
     try{
          System.out.println("Database connecting....");
               con=dataSource.getConnection();
          stmt=con.createStatement();
          System.out.println("Database connected....");
               i=stmt.executeUpdate("insert into login values('" + username + "','" + password + "')");
               System.out.println("Values inserted....");
               }catch(Exception e){
                    System.out.println(e.getMessage());
                    System.out.println("Exception in try");
                    e.printStackTrace();
          return 0;
But when i have run this then i got this Exception....
INFO: Initialize action of type: login.LoginAction
null
Database connecting....
null
Exception in try
java.lang.NullPointerException
     at login.LoginAction.insertUser(LoginAction.java:27)
     at login.LoginAction.execute(LoginAction.java:47)
     at org.apache.struts.chain.commands.servlet.ExecuteAction.execute(ExecuteAction.java:58)
     at org.apache.struts.chain.commands.AbstractExecuteAction.execute(AbstractExecuteAction.java:67)
     at org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
     at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
     at org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:304)
     at org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:190)
     at org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
     at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:825)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:743)
     at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
     at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
     at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
     at java.lang.Thread.run(Unknown Source)
Plz help me..

Answer 1

Read some Struts tutorial.