connectio null problem

this is my jsp class

this is my servlet part of code

protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        try {
            processRequest(request, response);
        } catch (SQLException ex) {
            Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

@Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        
             PrintWriter out = response.getWriter();
        Connection connection=null;
        try {

PrintWriter pw = response.getWriter();
            pw.write("HIIIIIIIIIIIIIII");

MyConnection con=new MyConnection();
            connection=con.getConnection();
            if(connection==null){
                 pw.write("connection is  NUUUUUUUUUUUUUUUUUUUUUUUUUUUUULLL");
            }
            Statement st=connection.createStatement();
            //String s="Insert into User values("+"'sudu'"+","+"'panadura'"+25+")";
            ResultSet res=st.executeQuery("Select * from User");
            while(res.next()){

int i = res.getInt("name");
          String s = res.getString("Emp_name");
          System.out.println(i + "\t\t" + s);
            }
           // st.executeUpdate(s);

} catch(Exception e){
            e.printStackTrace();
        }
        finally { 
            out.close();
        }

}

this is my connection class

But is prints Coeection is null

Your code seems to be written in a way to be deliberately unhelpful! Exception stack traces contain a wealth of information about what is going wrong. Print the stack trace - you should get an idea what could be happening.

this is the error

classLoader = WebappClassLoader
  delegate: true
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
EJBClassLoader : 
urlSet = []
doneCalled = false 
 Parent -> java.net.URLClassLoader@c52200
SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@152c4ce
Cannot load jspServlet.NewServlet reason : jspServlet.NewServlet
java.lang.ClassNotFoundException: jspServlet.NewServlet
        at com.sun.enterprise.loader.EJBClassLoader.findClassData(EJBClassLoader.java:738)
        at com.sun.enterprise.loader.EJBClassLoader.findClass(EJBClassLoader.java:628)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at com.sun.enterprise.deployment.annotation.impl.ModuleScanner.getElements(ModuleScanner.java:186)
        at com.sun.enterprise.deployment.archivist.Archivist.processAnnotations(Archivist.java:405)
        at com.sun.enterprise.deployment.archivist.Archivist.readAnnotations(Archivist.java:346)
        at com.sun.enterprise.deployment.archivist.Archivist.readDeploymentDescriptors(Archivist.java:318)
        at com.sun.enterprise.deployment.archivist.Archivist.open(Archivist.java:213)
        at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:813)
        at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:794)
        at com.sun.enterprise.deployment.backend.Deployer.loadDescriptors(Deployer.java:365)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.loadDescriptors(ModuleDeployer.java:426)
        at com.sun.enterprise.deployment.backend.WebModuleDeployer.deploy(WebModuleDeployer.java:160)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.doRequestFinish(ModuleDeployer.java:182)
        at com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.java:208)
        at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPhase.java:108)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeploymentService.java:966)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:283)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:835)
        at com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.java:187)
        at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:225)
Cannot load jspServlet.NewServlet reason : jspServlet.NewServlet
java.lang.ClassNotFoundException: jspServlet.NewServlet
        at com.sun.enterprise.loader.EJBClassLoader.findClassData(EJBClassLoader.java:715)
        at com.sun.enterprise.loader.EJBClassLoader.findClass(EJBClassLoader.java:628)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at com.sun.enterprise.deployment.annotation.impl.ModuleScanner.getElements(ModuleScanner.java:186)
        at com.sun.enterprise.deployment.annotation.impl.AnnotationProcessorImpl.process(AnnotationProcessorImpl.java:127)
        at com.sun.enterprise.deployment.archivist.Archivist.processAnnotations(Archivist.java:445)
        at com.sun.enterprise.deployment.archivist.Archivist.readAnnotations(Archivist.java:346)
        at com.sun.enterprise.deployment.archivist.Archivist.readDeploymentDescriptors(Archivist.java:318)
        at com.sun.enterprise.deployment.archivist.Archivist.open(Archivist.java:213)
        at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:813)
        at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:794)
        at com.sun.enterprise.deployment.backend.Deployer.loadDescriptors(Deployer.java:365)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.loadDescriptors(ModuleDeployer.java:426)
        at com.sun.enterprise.deployment.backend.WebModuleDeployer.deploy(WebModuleDeployer.java:160)
        at com.sun.enterprise.deployment.backend.ModuleDeployer.doRequestFinish(ModuleDeployer.java:182)
        at com.sun.enterprise.deployment.phasing.J2EECPhase.runPhase(J2EECPhase.java:208)
        at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPhase.java:108)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeploymentService.java:966)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:283)
        at com.sun.enterprise.deployment.phasing.PEDeploymentService.deploy(PEDeploymentService.java:835)
        at com.sun.enterprise.management.deploy.DeployThread.deploy(DeployThread.java:187)
        at com.sun.enterprise.management.deploy.DeployThread.run(DeployThread.java:225)
deployed with moduleid = CRUD
classLoader = WebappClassLoader
  delegate: true
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
EJBClassLoader : 
urlSet = []
doneCalled = false 
 Parent -> java.net.URLClassLoader@c52200
SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@152c4ce
deployed with moduleid = CRUD
classLoader = WebappClassLoader
  delegate: true
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
EJBClassLoader : 
urlSet = []
doneCalled = false 
 Parent -> java.net.URLClassLoader@c52200
SharedSecrets.getJavaNetAccess()=java.net.URLClassLoader$7@152c4ce
deployed with moduleid = CRUD
java.lang.NullPointerException
        at jspServlet.Test.doPost(Test.java:59)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
        at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
        at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)

Well, though that stack trace certainly looks bad it is not comming from your connection code. Did you print the stack trace from there?

java.lang.NullPointerException
        at jspServlet.Test.doPost(Test.java:59)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:754)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
        at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
        at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)

You probably need a stackTrace in getConnection method in MyConnection class to know the reason.

Thanks.
I didn't add the mysql connector jar.