NullPointerException « Development « JSP-Servlet Q&A

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I replace with this to catch the null. <% String s = item.getOrderNumber(); %> <% if(s != null) { %> <% } %>

1. Why does my servlet stacktrace show "Unknown Source" for my classes?    stackoverflow.com

I'm currently using Apache Tomcat 5.5.16 to serve a Lucene-based search API. Lately I've been having some NullPointerExceptions inside my servlet class. The class is called com.my_company.search.servlet.SearchServlet. With certain types of input ...

2. nullpointer exception when initalizing a class in servlet    stackoverflow.com

 class mstLeastCountEdit {
    mstLeastCount reff;
    HttpServletRequest request;
    HttpServletResponse response;
    String msg = "";
    String LcDesc="";
 ...

3. java.lang.NullPointerException: No FileItemFactory has been set    stackoverflow.com

In attempting to implement fileUpload using the streaming API I get an error described below: As I gather from the Streaming API web page that the "traditional FileItemFactory is completely ...

4. How to get Details on NullPointerException in JSP?    stackoverflow.com

I am getting a null pointer exception in jsp and I want to find out what line has the null variable so i can fix it. Is there any simple way ...

5. I have a problem of null pointer Exception in servlet     stackoverflow.com

HI, all I have a problem of null pointer Exception in servlet . I have a form a.jsp with check box if I do not select this check box and submit form then ...

6. Help on a NullPointerException error    stackoverflow.com

I have been trying to modify the following code in JSP from here: 

ArrayList arrayList=new ArrayList(); 
String  = "tagToFind";
Node n = node.getParentNode();
String printOut = "";
while (n != null && !n.getNodeName().equals(tagToFind)) ...

7. Why are my longs turning into ints?    stackoverflow.com

I'm working on a JSP page, but I'm running into a null pointer at run time. In an attempt to isolate the problem, I hard-coded the expected variable response instead of ...

8. java.lang.NullPointerException in my Java/JSP application    stackoverflow.com

I am getting a java.lang.NullPointerException when I am redirecting the output from a Java class to a JSP page and cannot figure out what's wrong. Any help would be greatly appreciated. Here ...

9. Getting NullPointerException : I am trying read value defined in jsp file SendSms.jsp in SmsServlet file    stackoverflow.com

I am trying read value defined in jsp file SendSms.jsp in SmsServlet. I am getting below error. If I run without request.getParameter() it will work. Below is the error am getting type ...





10. Getting stack trace from NullPointerException    stackoverflow.com

my servlet is throwing a NullPointerException. I want to show the full stack call trace so that I can find out the line number the exception is being thrown at. How can ...

11. Null Pointer Exception while communicating between servlets    stackoverflow.com

I have login code in one servlet:LoginGtalkServlet.. 

 XMPPConnection connection;

 //@see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)


 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    String userName = request.getParameter("username");
 ...

12. How comes i get a null pointer in a JSP file on a line which isnt at server side?    stackoverflow.com

I have the fallowing JSP file wherein I create a jsGrid in order to menipulate data in my server. Somehow I can't get it running. 

       ...

13. NullPointerException in jsp but not in console    stackoverflow.com

RecupData my class returns a NullPointerException only in the web. I connect to a pgsql db 8.3.7 - the script works well in 'console' syso - but a test web NullPointerException is ...

14. null pointer exception in java servlet    stackoverflow.com

I got a "null pointer exception" fault in java servlet. Could someone tell me what happens? And how to avoid that? I know java servlet can be used as part of ...

15. Why does this JSP scriptlet fail with a NullPointerException?    stackoverflow.com

I can print out pageModel.foo using EL: 

${pageModel.foo}
But this scriptlet fails at the line where I check the length() of foo: 
java.lang.String foo = (java.lang.String)pageContext.getAttribute("pageModel.foo");
if(foo.length()>10){
    foo = foo.substring(0, 9);
}
It throws ...

16. Failed JSP Nullpointer Exception    stackoverflow.com

Having a bit of trouble with a server test that keeps throwing up the error 'ERROR org.mortbay.log - failed jsp' followed by a stack trace with NullPointerException. The server will still ...





17. Java NullPointerException on HttpServletResponse line    stackoverflow.com

Ok I am running the JSf application and I get an error of NullPointerException on line 220 which is 

response.setContentType("text/html");
not sure why would this be the issue. The full method in ...

18. Hashtable's java. lang. NullPointerException    coderanch.com

19. NullPointerException    coderanch.com

I hope that I'm posting this to the correct forum. I'm getting the following error when trying to instantiate one of my Beans. on line '5' failed. java.lang.NullPointerException at CalendarDisplay.(CalendarDisplay.java:16) Here's the first 16 lines of my Java code: import java.util.Calendar; import java.util.GregorianCalendar; import java.util.Date; public class CalendarDisplay { private Calendar currentDate; private Calendar thisDate; private Calendar firstDateOfWeek; private int ...

20. null pointer exception    coderanch.com

21. NullPointerException while running a jsp    coderanch.com

22. NullPointerException, but no root cause    coderanch.com

I get a NullPointerException from my jsp page but no root cause or line number, how can this be? org.apache.jasper.JasperException at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:254) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) at org.jboss.web.tomcat.security.JBossSecurityMgrRealm.invoke(JBossSecurityMgrRealm.java:220) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.jboss.web.tomcat.tc4.statistics.ContainerStatsValve.invoke(ContainerStatsValve.java:76) at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) at ...

23. Jsp precompile with Ant and NullPointerException    coderanch.com

24. NullPointerExceptions everywhere    coderanch.com

Hi all java gurus 1 qn on java here. I have 2 large scale jsp projects and they worked fine on the local machines. However when deployed to remote machines a real nasty problem came in. If I press in IE F5 refresh a few times on remote side, on the 2nd, 3rd, 4th time I would get nullPointerExceptions or jdbc ...

25. NullPointerException Problem    coderanch.com

26. getting a NullPointerException    coderanch.com

27. NullPointerException    coderanch.com

28. Null Pointer Exception    coderanch.com

29. NullPointerException in SimpleTag    coderanch.com

30. NullPointerException    coderanch.com

31. null pointer exception    coderanch.com

32. NullPointerException in JSP after calling Servlet method    coderanch.com

33. getAttributes return NullPointerException    coderanch.com

34. Null pointer exception in jsp    coderanch.com

35. Null Pointer Exception error    coderanch.com

36. gettin NullPointerException    coderanch.com

Hi all, i have one jsp like one.jsp, iam calling(including) this one.jsp from another jsps(so many like >50) in that(ie:-calling pages other than one.jsp) some pages used then, i have one requirement, that i need to get one value using that "lbean" id of if i passed that value from calling jsps to one.jsp, i need ...

37. Null pointer exception using CachedRowSetImpl in Servlet    coderanch.com

38. Null Pointer Exception in running the HeadFirst Chapter 1 Example    coderanch.com

Hi Everyone, I have tried the HF chapter 1 example but I get an null Pointer exception in the home.create() in the client code. Code runs successfully up to that point. When I chek (home==null) it returns true.I am using SJSAS 8.2 App server and JDK 1.5. I have done everything according to the book and all the classpaths,JNDIs etc are ...

39. JSP NullPointerException in the next morning    coderanch.com

40. Unknown cause of NullPointerException in JSP    coderanch.com

For verification on the "item" not being null, the following code works fine.

Acknowledgement&l t;/TD> The generated result is: Acknowledgement
Acknowledgement&l t;/TD> <% } else { %> Acknowledgement
<% } %> The ...

41. getServletContext() throws NullPointerException    coderanch.com

42. Problems to find NullPointerExceptions in Servlets    coderanch.com

43. Problem in my servlet - throws NullPointerException    coderanch.com

44. JDBC query working. Servlet with same code throwing NullPointerException    coderanch.com

I successfully tested JDBC connection of SQL Server with a small example. But when I incorporated the same code in a Web application it is throwing nullpointerexception.import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import java.io.*; public class FaqServlet extends HttpServlet { private Connection connection; private Statement statement; private String errorMsg=""; public void init( ServletConfig config ) throws ServletException { try { Class.forName(config.getInitParameter("databaseDriver")); ...

45. NullPointerException while using DI    coderanch.com

Hi Vaibhav, Im not implementing EJB for the first time, although Im new to DI. You can find that Im using Stateless Session bean by looking at the @Stateless annotation. You could also find that Im using Remote view using the @Remote annotation. Im not sure what you meant by creating a new instance of Component Interface. In GlassFish AS, we ...

46. java.lang.NullPointerException in Opening JSP fle    coderanch.com

Bear's response contains the information necessary to understand where the NPE's are coming from. As to why it started to fail, that's hard to say w/o knowing the history of the source: I find it *very* unlikely that the source as presented here *ever* worked--it will always fail when the page is first loaded, before a submit (to the same JSP). ...

47. ServletContext Null pointer Exception    coderanch.com

48. org.apache.jasper.JasperException: java.lang.NullPointerException    coderanch.com

Hi, I am getting following error in my JSP:- org.apache.jasper.JasperException: java.lang.NullPointerException org.apache.jasper.runtime.JspRuntimeLibrary.internalIntrospecthelper(JspRuntimeLibrary.java:361) org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(JspRuntimeLibrary.java:308) org.apache.jsp.Test_jsp._jspService(Test_jsp.java:78) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390) root cause java.lang.NullPointerException org.apache.jasper.runtime.JspRuntimeLibrary.internalIntrospecthelper(JspRuntimeLibrary.java:322) org.apache.jasper.runtime.JspRuntimeLibrary.introspecthelper(JspRuntimeLibrary.java:308) org.apache.jsp.Test_jsp._jspService(Test_jsp.java:78) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267) javax.servlet.http.HttpServlet.service(HttpServlet.java:717) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390) I am trying to read the value from a form and store it in a bean and dislay it in another JSP. Line no 78 of Test_jsp.java ...

49. new to J2ee NullPointerException in remote client    coderanch.com

50. JSP throwing null pointer exception the first time I run it    coderanch.com

Hi, I am facing a unique problem in JSP, I am running the below code as a webtab in one of my applications, i.e inside my application I have a provision to build in custom jsp pages and then to embed them inside an application, when i save my jsp and for the first time try to run it, it throws ...

51. Please solve my java.lang.NullPointerException error.?    coderanch.com

Guys i got file enroll.jsp while executing that i got java.lang.NullPointerException. So please solve this, my code as follows Code: //enroll.jsp// <%@ page import="INCLUDES.DBConnection"%> <%@ page import="java.sql.*"%> <%@ page import="java.io.*"%> <%@ page import="java.util.*"%> <% int course_id=Integer.parseInt(request.getParameter("course_id")); int no_of_papers=0; String statement=""; try { statement="select no_of_papers from x_masterListOfCourses where ...

52. Please solve my "java.lang.NullPointerException" error    coderanch.com

53. NullPointerException at service.getPort().    coderanch.com

54. null pointer exception after response.sendRedirect() in jsp page.    coderanch.com

55. NullPointerException on getServletContext    coderanch.com

56. javax.faces.el.EvaluationException: java.lang.NullPointerException when updating    coderanch.com

57. NullPointerException in LdapClient.usingSaslStreams()    coderanch.com

58. null pointer exception    coderanch.com

59. org.apache.jasper.JasperException: java.lang.NullPointerException    coderanch.com

60. Null pointer exception with Submit.    coderanch.com

61. NullPointerException returned usig a StoredProcedureCall    coderanch.com

62. error :java.lang.NullPointerException in searchuser.jsp page    go4expert.com

Hi, I am creating the updateuser.jsp page. For that I create search.jsp where one can serch users and after submitting this page.it should display the updateuser.jsp page where I can update the details of user. Here is my code of searchuser.jsp: Code: <% Connection connection = null; Statement st = null; ResultSet rs = null; Class.forName("com.mysql.jdbc.Driver"); Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mynewdatabase","root", "root123"); ...

63. Hello Genius.. Pls solve my "java.lang.NullPointerException" error    go4expert.com

My project is e learning project. I've a "choose the correct answer" module. When the click the "begin test" button it should fetch the questions and options from database and display it. Instead of that my page displays "java.lang.NullPointerException". I've assigned unique values for each error. So the exact error it display as "error occured 56 : java.lang.NullPointerException" I have found ...

64. DownLoad A File "NullPointerException"    java-forums.org

i get java.lang.NullPointerException.... the code is below public void service( HttpServletRequest request, HttpServletResponse response ) throws IOException{ response.setContentType("text/plain"); response.setHeader("Content-Disposition", "attachment;filename=sample.txt"); ServletContext ctx = getServletContext(); InputStream is = ctx.getResourceAsStream("sample.txt"); int read=0; byte[] bytes = new byte[BYTES_DOWNLOAD]; OutputStream os = response.getOutputStream(); while((read = is.read(bytes))!= -1){ os.write(bytes, 0, read); } os.flush(); os.close(); } can any one help me to fix the exception

65. HTTP Status 500 - java.lang.NullPointerException    java-forums.org

You ought to post code in code tags (with square brackets). I had to hazard a guess (you should have told us which line is the one causing the problem), but is "type" null? Is there a field on the form called "type" and are you putting anything in it before clicking register?

66. Null pointer exception    java-forums.org

67. NullPointerException in Servlet    java-forums.org

68. JAX-RS Servlet - EntityManagerFactory.createEntityManager() throwing null pointer exception - Glassfish 3.1    java.net

While trying the example for JAX-RS (the last one), i facing NullPointerException while creating entity manager from the injected entity manager factory. below is the exception stacktrace. It would be helpful, to you know your insight. This exception occurs exactly while creating entity manager. However, the same approach works with other example when entitymanagerfactory is injected to HelloServlet.

69. Servlet.service() for servlet FacesServlet threw exception java.lang.NullPointerException    java.net

Thanks. |WARNING|sun-appserver2.1|javax.enterprise.resource.webcontainer.jsf.lifecycle|_ThreadID=16;_ThreadName=httpWorkerThread-4848-0;_RequestID=cd896498-be98-4009-98b1-1f97627eea75;|executePhase(RESTORE_VIEW 1,com.sun.faces.context.FacesContextImpl@896098) threw exception java.lang.NullPointerException at com.sun.jsftemplating.layout.ViewRootUtil.getLayoutDefinitionKey(ViewRootUtil.java:271) at com.sun.jsftemplating.layout.LayoutViewHandler.restoreView(LayoutViewHandler.java:611) at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:141) at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.execute(PartialTraversalLifecycle.java:80) at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244) at com.sun.enterprise.tools.admingui.servlet.DelayedInitFacesServlet.service(DelayedInitFacesServlet.java:89) at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:333) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:240) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313) 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 ...

70. PWC1406: Servlet.service() makes java.lang.NullPointerException    java.net

71. search.jsp NullPointerException    liferay.com

72. SEVERE: Servlet.service() for servlet zkLoader threw exception java.lang.NullPointerException: Null    zkoss.org

SEVERE: Servlet.service() for servlet zkLoader threw exceptionjava.lang.NullPointerException: Null Pointer in Method Invocationat bsh.Name.invokeMethod(Unknown Source) at bsh.BSHMethodInvocation.eval(Unknown Source) at bsh.BSHPrimaryExpression.eval(Unknown Source) at bsh.BSHPrimaryExpression.eval(Unknown Source) at bsh.BSHIfStatement.evaluateCondition(Unknown Source) at bsh.BSHIfStatement.eval(Unknown Source) at bsh.Interpreter.eval(Unknown Source) at bsh.Interpreter.eval(Unknown Source) at org.zkoss.zk.scripting.bsh.BSHInterpreter.exec(BSHInterpreter.java:119) at org.zkoss.zk.scripting.util.GenericInterpreter.interpret(GenericInterpreter.java:310) at org.zkoss.zk.ui.impl.PageImpl.interpret(PageImpl.java:796) at org.zkoss.zk.ui.impl.UiEngineImpl.execNonComponent(UiEngineImpl.java:753) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:553) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:498) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild0(UiEngineImpl.java:631) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreateChild(UiEngineImpl.java:587) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate0(UiEngineImpl.java:531) at org.zkoss.zk.ui.impl.UiEngineImpl.execCreate(UiEngineImpl.java:498) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage0(UiEngineImpl.java:378) at org.zkoss.zk.ui.impl.UiEngineImpl.execNewPage(UiEngineImpl.java:299) at org.zkoss.zk.ui.http.DHtmlLayoutServlet.process(DHtmlLayoutServlet.java:229) ...

73. Null pointer exception on a jsp page    forums.oracle.com

74. my servlet throws java.lang.NullPointerException when calling service()    forums.oracle.com

75. ServletFileUpload java.lang.NullPointerException    forums.oracle.com

76. Servlet NullPointerException    forums.oracle.com

I am getting an HTTP 500 error when I dispatch a request from a login servlet to a registration servlet. I am calling the Registration's servlet doGet method from the doGet method of the login servlet using the RequestDispatcher object. When I call the Registration servlet directly from the browser I do not get any errors, but I am getting an ...