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POError when accessing JSONObject in servlet
 

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  1. POError when accessing JSONObject in servlet
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    <p>I am having the following error in my project when I tried to access JSONObject in my servlet.</p> <p>My servlet code is,</p> <pre><code>package org.java.test; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; @WebServlet("/HelloWorld") public class HelloWorld extends HttpServlet { private static final long serialVersionUID = 1L; /** * @see HttpServlet#HttpServlet() */ public HelloWorld() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String username = request.getParameter("usernameTxt"); String password = request.getParameter("passwordTxt"); response.setContentType("application/json"); PrintWriter out = response.getWriter(); JSONObject obj = new JSONObject(); try { obj.put("name", "foo"); } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); } out.print(obj); out.flush(); } /** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub response.getWriter().println("HelloWorld"); } } </code></pre> <p>Also my html code is,</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css" /&gt; &lt;script src="http://code.jquery.com/jquery-1.9.1.js"&gt;&lt;/script&gt; &lt;script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"&gt;&lt;/script&gt; &lt;script type="text/javascript" &gt; $(function(){ $("#submitBtn").click(function(){ var inputdata = { usernameTxt : $("#usernameTxt").val() , passwordTxt: $("#passwordTxt").val() }; $.ajax( { url : 'HelloWorld', type : 'GET', data : inputdata, dataType : 'json', success: function(data) { $('#hi').text(data.username); $('#hi2').text(data.password); } }); }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;input type="text" id="usernameTxt" placeholder="Username" &gt; &lt;br/&gt; &lt;input type="text" id="passwordTxt" placeholder="Password" &gt; &lt;br/&gt; &lt;input type="button" id="submitBtn" value="Login" &gt; &lt;br/&gt; &lt;div id="hi"&gt;&lt;/div&gt; &lt;div id="hi2"&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>My errors in detail are,</p> <pre> SEVERE: A child container failed during start java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:252) at java.util.concurrent.FutureTask.get(FutureTask.java:111) at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1123) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.startup.Catalina.start(Catalina.java:684) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:456) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) at java.lang.Thread.run(Thread.java:722) Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131) at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:800) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 7 more Jun 30, 2013 9:15:41 PM org.apache.catalina.startup.Catalina start SEVERE: Catalina.start: org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.startup.Catalina.start(Catalina.java:684) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:322) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:456) Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:732) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 7 more Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154) at org.apache.catalina.core.StandardService.startInternal(StandardService.java:443) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 9 more Caused by: org.apache.catalina.LifecycleException: A child container failed during start at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1131) at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:302) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) ... 11 more Jun 30, 2013 9:15:41 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 665 ms </pre> <p>I have already added <code>Commons-logging-1.1.1.jar.</code> I am Stucked here since a week. Please help me out.</p>
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    1. PTQuestion
    1. USDaniel Vérité
    1. USChandu8892
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    1. COYou can't get startup errors from the methods shown in your servlet. Either you are misunderstanding where the error is occurring, or you are showing the wrong error log entries (or both).
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      1. USPerception
    2. COI have entered the exact code what i have in my project.And i got the errors as i mentioned above.There is no misunderstanding and also it is the exact error log i got.please help me....
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      1. USChandu8892
    3. COYou get this error when you submit the form or when you deploy your web application?
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      1. USPerception
 

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