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POforce close application
 

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    <p>when i click on the login button my application force closes...why is it??? what is the solution for this?</p> <p>I have my Login_Menu activity as follows:-</p> <pre><code>package com.campuspro.start; import java.util.ArrayList; import java.util.List; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.NameValuePair; import org.apache.http.client.HttpClient; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.HttpPost; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.ProgressDialog; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class Login_Menu extends Activity { EditText usname; EditText pass; TextView tv; HttpClient client; HttpPost post; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.login_lay); tv=(TextView) findViewById(R.id.login_stat_tv); usname=(EditText)findViewById(R.id.uname); pass=(EditText)findViewById(R.id.pass); Button login=(Button)findViewById(R.id.login_but); Button cancel=(Button)findViewById(R.id.cancel_but); client = new DefaultHttpClient(); String url="http://10.0.2.2:7001/proj/login.jsp"; post = new HttpPost(url); login.setOnClickListener(new View.OnClickListener() { public void onClick(View arg0) { // TODO Auto-generated method stub new login().execute(""); } }); cancel.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // TODO Auto-generated method stub usname.getText().clear(); pass.getText().clear(); } }); } private class login extends AsyncTask&lt;String, Void, JSONObject&gt;{ ProgressDialog dialog = ProgressDialog.show(Login_Menu.this, "", "Authenticating, Please wait..."); @Override protected JSONObject doInBackground(String... params) { // TODO Auto-generated method stub Log.i("thread", "Doing Something..."); //authentication operation try{ List&lt;NameValuePair&gt; pairs = new ArrayList&lt;NameValuePair&gt;(); pairs.add(new BasicNameValuePair("username",usname.getText().toString())); pairs.add(new BasicNameValuePair("password",pass.getText().toString())); post.setEntity(new UrlEncodedFormEntity(pairs)); HttpResponse response = client.execute(post); int status=response.getStatusLine().getStatusCode(); if(status == 200) { HttpEntity e=response.getEntity(); String data=EntityUtils.toString(e); JSONObject last=new JSONObject(data); return last; } } catch(Exception e) { e.printStackTrace(); } return null; } protected void onPreExecute(){ //dialog.dismiss(); Log.i("thread", "Started..."); dialog.show(); } protected void onPostExecute(JSONObject result){ Log.i("thread", "Done..."); String name; try { name = result.getString("status"); if(dialog!=null) dialog.dismiss(); if(name.equalsIgnoreCase("yes")){ tv.setText("user found"); Intent myIntent=new Intent("com.campuspro.start.MYMENU"); startActivity(myIntent); }else{ tv.setText("No User Found, please try again!"); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }} </code></pre> <p>My login.jsp page is as follows...</p> <pre><code> &lt;%@page contentType="text/html; charset=UTF-8"%&gt; &lt;%@page import="org.json.simple.JSONObject"%&gt; &lt;%@page import="java.util.*,java.sql.*"%&gt; &lt;%! Connection con; PreparedStatement ps; ResultSet rs; String x,y; %&gt; &lt;% Class.forName("oracle.jdbc.driver.OracleDriver"); con=DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","pro","pro"); x=request.getParameter("username"); y=request.getParameter("password"); ps=con.prepareStatement("select * from login_stud where uname=? and pass=?"); ps.setString(1,x); ps.setString(2,y); rs=ps.executeQuery(); JSONObject obj=new JSONObject(); if(rs.next()) { obj.put("status","yes"); out.print(obj); } else { obj.put("status","no"); out.print(obj); } out.flush(); %&gt; </code></pre> <p>This is my log cat....</p> <pre><code> 04-15 23:42:06.449: I/thread(276): Started... 04-15 23:42:06.460: I/thread(276): Doing Something... 04-15 23:42:07.950: D/dalvikvm(276): GC_FOR_MALLOC freed 3284 objects / 170544 bytes in 156ms 04-15 23:42:10.469: I/thread(276): Done... 04-15 23:42:10.469: D/AndroidRuntime(276): Shutting down VM 04-15 23:42:10.469: W/dalvikvm(276): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 04-15 23:42:10.509: E/AndroidRuntime(276): FATAL EXCEPTION: main 04-15 23:42:10.509: E/AndroidRuntime(276): java.lang.NullPointerException 04-15 23:42:10.509: E/AndroidRuntime(276): at com.campuspro.start.Login_Menu$login.onPostExecute(Login_Menu.java:117) 04-15 23:42:10.509: E/AndroidRuntime(276): at com.campuspro.start.Login_Menu$login.onPostExecute(Login_Menu.java:1) 04-15 23:42:10.509: E/AndroidRuntime(276): at android.os.AsyncTask.finish(AsyncTask.java:417) 04-15 23:42:10.509: E/AndroidRuntime(276): at android.os.AsyncTask.access$300(AsyncTask.java:127) 04-15 23:42:10.509: E/AndroidRuntime(276): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 04-15 23:42:10.509: E/AndroidRuntime(276): at android.os.Handler.dispatchMessage(Handler.java:99) 04-15 23:42:10.509: E/AndroidRuntime(276): at android.os.Looper.loop(Looper.java:123) 04-15 23:42:10.509: E/AndroidRuntime(276): at android.app.ActivityThread.main(ActivityThread.java:4627) 04-15 23:42:10.509: E/AndroidRuntime(276): at java.lang.reflect.Method.invokeNative(Native Method) 04-15 23:42:10.509: E/AndroidRuntime(276): at java.lang.reflect.Method.invoke(Method.java:521) 04-15 23:42:10.509: E/AndroidRuntime(276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 04-15 23:42:10.509: E/AndroidRuntime(276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 04-15 23:42:10.509: E/AndroidRuntime(276): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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