Error in retrieving data from database

Hi,
I'm now developing a program using servlet and oracle 8.1.5.0.0
I've encountered this error while I run my program:
NullPointerException
What does this means?
When I compiled that time, there is no error on the program.
Is it caused by there is no any parameter received by the database when it tried to retrieve the data but I have used the
request.getParameter("name") method to get the parameter and passed on to the database.
What's wrong with it..Please help me..
Your help will be much appreciated.
Thank You/
Regards,
Josephine

You may want to post the error stack and a small amount of source code. As you most likely are aware, the null pointer exception is a generic java error. It means that something has tried to execute a method or value from an object that is null. It is rearly (if not never) found at compile time.

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Error message-retrieve data from database

I tried to retrieve data from oracle database. I got the following error message. I did compile the files without error. but when I run index.jsp I got the following error message. is it related with taglib Directives ?
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /index.jsp:8
5: <% AccessDB accessDB=new AccessDB(); %>
6:
7: <%-- create an instance of List, then retrieve SubjectNames --%>
8: <% List subjNames=accessDB.getSubjectName(); %>
9:
10: <%-- make list accessible to page --%>
11: <% request.setAttribute("subjNames", subjNames); %>
Stacktrace:
     org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:504)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
root cause
java.lang.NullPointerException
     org.AccessDB.getSubjectName(AccessDB.java:68)
     org.apache.jsp.index_jsp._jspService(index_jsp.java:62)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.
Apache Tomcat/5.5.17

Hi,
Try to print the value in List...n comment the request.setAttribute...n then run the program....
check wot value is printed in List....
This error may b because the List doesnt have anyvalue into it.....

Error:Failed to retrieve data from database [Vendor Code:3001]

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@oradba:Hi Thanks for getting bak. Well i have ran the query using PL/SQL Developer tool and yes its mapping to ORA-03001:unimplemented feature. i dont know what the problem is.
@centinul: well i dont have any views in there.but still cudnt figure out why its throwing tht error
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Edited by: user11961230 on Nov 12, 2009 7:12 AM

Try to retrieve data from database got error message

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PreparedStatement ps = con.prepareStatement("SELECT * from gbook where emailid =? AND date =?");
ps.setString(1,str1);
ps.setString(2,str2);
ps.setDate(3,new java.sql.Date(dt.getTime()));Your SQL query has 2 placeholders but you try to set 3 values.
And didn't you read the stack trace?
guestbk.doGet(guestbk.java:32)You could've tracked down line 32 and seen what was there at that line.
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Help them help you.
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Failed to retrieve data from database?

I am a new user
When I try to Preview a document I am prompted to enter in database information.
I have tried a few times to connect to my server and
continuously keep getting the same error page
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" Details: ADO Error Code:0x
Source: Microsoft OLE DB Provider SQL server
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SQL State:42502
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When the OLE DB(ADO) page opens and asks for a server and a database, what is needed to stop the error from happening
If anyone has any information that would be great !

SQL State:42502 means an user authorization error. Check the user and it's access to the target database.

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The next is an example but you can find this information in
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Hi Nick,
To retreive data for TOLERANZOB from QAMV,
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SELECT SINGLE TOLERANZOB FROM QAMV INTO TOLERANZOB WHERE keyfields.
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SELECT TOLERANZOB FROM QAMV UPTO ONE ROWS INTO TOLERANZOB WHERE....
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<b>Reward points for helpful answers.</b>
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Hi
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Hello Friend try this code
dbdata.jsp
<%@page language="java" import="java.sql.*"%>
<html>
<%
Class.forName("..........");
Connection n=DriverManager.getConnection ("....","...","...");
Statement st=con.createStatement();
ResultSet rs=st.executeQuery("select ename from emp");
%>
<body>
<form>
<select>
<%
while(rs.next())
%>
<option><%=rs.getString("ename")%></option>
<%
%>
</select>
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Error retrieving data from database

my problem is i cant connect my eclipse to database
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Error parsing data org.json.JSONException: Value <html><body><h2>Checking of type java.lang.String cannot be converted to JSONObject
my apps can run correctly before...but last night i cant open it when want to retrieve any data from database
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This doesn't seem to have anything to do with Eclipse, but I'd guess that a server-side error message is being returned a HTML rather than the JSON you expect.

Error while retrieving data from PL/SQL Table using SELECT st. (Urgent!!!)

Hi Friends,
I am using Oracle 8.1.6 Server, & facing problems while retrieving data from a PL/SQL Table:
CREATE or REPLACE PROCEDURE test_proc IS
TYPE tP2 is TABLE of varchar2(10); --declared a collection
dt2 tP2 := tP2('a','b','c');
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ERROR at line 1:
ORA-00600: internal error code, arguments: [15419], [severe error during PL/SQL execution], [], [],
ORA-06544: PL/SQL: internal error, arguments: [pfrrun.c:pfrbnd1()], [], [], [], [], [], [], []
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Thanks Roger for the Update.
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If someone have any other idea on this, please do let me know.
Thanks a lot for all help.
Best Regards,
Jay Raval.
You have to define a database type...
create type tP2 is table of varchar2(10)
CREATE OR REPLACE PROCEDURE TEST_PROC
IS
dt2 tP2 := tP2('a','b','c');
i NUMBER(8);
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Roger

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It's simpler to do so:
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Message was edited by:
RV

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Crystal Reports 12.1.0.892
Windows XP SP3
DataDirect ODBC Driver for Paradox 5.30.00.23
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I tried the Add Command option and entered the SQL query as follows:
select ticket1a.patronid, phonelin.phonenumber
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select ticket1a.patronid, phonelin.phonenumber
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If I use the Microsoft Paradox driver (which is very slow. 15 minutes to run this query) and use the following SQL query:
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We hava an Oracle stroed procedure which has a table type as its OUT parameter and where the data is being entered into. This data requries to be returned to the Java client through a JDBC connection. We have used the OracleTypes' ARRAY object for this. We are facing errors when retieving data from the ARRAY resultset
The Oracle Package
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CREATE OR REPLACE TYPE PlSqlTable IS TABLE OF VARCHAR2(20);
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PROCEDURE testSQL
arrayOutID OUT PlSqlTable
Then populated the object :
arrayOutID := PlSqlTable();
arrayOutID.extend(4);
arrayOutID(1):= 'Hello';
arrayOutID(2) := 'Test';
arrayOutID(3) := 'Ora';
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The Java class
----Here is how I have defined the parameters :
OracleCallableStatement stmnt = (OracleCallableStatement)connection.prepareCall("begin testSQL(?);end;");
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haven't worked with db arrays but I think your problem is here:int i = 1;
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Good Day!
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Editing a given data. We have to retrieve the given data and post it to another form "Editing form".
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The client is a web browser.
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DO Web Service allow you to retrieve data from database and make it pluggab

Can Web Services allo you to retrieve data from the database and do they make the pluggable by allow you to plug them into any database.. how is that possible....

Going through the javaee tutorial is one sure way of accelerating your learning curve, as almost every basic you will need to get your job done is explaiined well in there. i have been using it to learn building enterprise application and is awesome good resource.
seriously consider downloading it
java.sun.com/javaee/5/docs/tutorial/doc/

Error in retrieving data from database

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