Servlet-jdbc problem
hello all,
I am writing a simple servlet which will extract data (empno and empname) from a html form and insert in to database.
everything seems to work fine except it inserts in to the table empno and empname as it is without values.
if u can think of some reason and specify it would be great.
thanx once again.
mahesh
anyway i have those 2 small programs as below :
enterinfo.java - for generating entry form
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class EnterInfo extends HttpServlet
public void service(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
res.setContentType("text/html");
PrintWriter out=res.getWriter();
out.println("<html><body>");
out.println("<form name=\"insertdata\" method=\"post\" action=\"msgservlet\">");
out.println("Emp No<input type=text name=empno><br>");
out.println("Emp Name<input type=text name=empname><br>");
out.println("<input type=submit value=send>");
out.println("</form></body></html>");
msgservlet.java - for extracting data and inserting data in to the table
import java.io.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class msgservlet extends HttpServlet
private Connection con;
private PrintWriter out;
private Statement stmt;
public void init(ServletConfig conf) throws ServletException
super.init(conf);
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
catch(ClassNotFoundException cnfe)
System.err.println("Details:"+cnfe);
System.exit(0);
try
conrjc();
//con=DriverManager.getConnection("jdbc:odbc:njdbc");
catch(SQLException sqle){
System.err.println("Details"+sqle);
public void conrjc() throws SQLException
con=DriverManager.getConnection("jdbc:odbc:njdbc");
public void service(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException{
res.setContentType("text/html");
try{
out=res.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Sample JDBC Servlet</title>");
out.println("</head>");
out.println("<body>");
stmt=con.createStatement();
int eno=Integer.parseInt(req.getParameter("empno"));
String enm=req.getParameter("empname");
//String ins="insert into MYEMPLOYEE values('req.getParameter("empno")','req.getParameter("empname")')";
stmt.executeUpdate("insert into MYEMPLOYEE values(eno,enm)");
out.println("<h1>OK</h1>");
// stmt.close();
con.commit();
catch(SQLException se){
out.println("An SQL Exception was Thrown"+ se);
catch(IOException se){
out.println("An IO Exception was Thrown");
out.println("</body>");
out.println("</html>");
out.close();
public void destroy(){
try{
con.close();
catch(SQLException sqle){}
try using the following statement instead on the previous one...
stmt.executeUpdate("insert into MYEMPLOYEE values('"+eno+"','"+enm+"')");
Usually strings are passed as 'string' to be inserted into the database. Make sure you know what data type you are inserting into the database (from database design). However, prepared statement should work as well.
Hope this helps
AAJ
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^
1 error
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import java.io.*;
import java.util.Date;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.sql.*;
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private Connection connection;
private Statement statement;
private ResultSet resultSet;
private ResultSetMetaData rsmd;
private String SQL;
private String str_HTML_Result;
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String username = "test";
String password = "test";
// Load the driver to allow connection to the database
try {
Class.forName( "sun.jdbc.odbc.JdbcOdbcDriver" );
connection = DriverManager.getConnection(url, username, password );
catch ( ClassNotFoundException cnfex ) {
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String clicked = request.getParameter("CLICKED");
String ratio = request.getParameter("RATIO");
String email = request.getParameter("EMAIL");
String category = request.getParameter("CATEGORY");
response.setContentType("text/html");
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out.println("<head>");
out.println("<title>Ad Manager Ad Removal Section</title>");
out.println("</head>");
out.println("<body bgcolor=\"#999999\" text=\"#000000\">");
out.println("<div align=\"center\">");
out.println("<font face=\"Arial, Helvetica, sans-serif\" size=\"5\" color=\"#DDDD00\">");
out.println("<b>Banner Manager Ad Removal Section</b></font></div>");
out.println("<br>");
out.println("<hr>");
out.println("<table border=" + "\"" + "0" + "\"" +" width=" + "\"" + "100%" + "\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">");
if((ad_id!=null) && (ad_path!=null) && (email!=null) && (category!=null)) {//**Is this rignt??**
//**Is this rignt??**
out.println (DataAmmend(ad_id, ad_path, email, category)); //**Is this rignt??**
} //**Is this rignt??**
out.println(getDataTable());
/*============================================================================*/
// Main Page HTML
/*============================================================================*/
out.println("</table>");
out.println("<br>");
out.println("<hr>");
out.println("<br>");
out.println(new Date());
out.println("<form ACTION='http://localhost:8080/examples/servlet/ad3' METHOD = GET>");
out.println("<center><B><font face=\"Arial, Helvetica, sans-serif\" size=\"2\"> Ad ID </B>");
out.println("<input type=text name ='ADID'><br>");
out.println("<B> Email Address </B>");
out.println("<input type=text name ='email'>");
out.println("<B> Category </B>");
out.println("<input type=text name ='category'>");
out.println("<B> Ad Path </B>");
out.println("<input type=text name ='ad_path'><p>");
out.println("<input type=submit value = 'Submit'></p>");
out.println("</form>");
out.println("</Font>");
out.println("<br><br>");
out.println("<center><a href = http://localhost:8080/examples/servlet/ad> <b><font face=\"Arial, Helvetica, sans-serif\" size=\"3\">Click here to add a new banner to the system</b></a><br>");
out.println("</center></body>");
/*============================================================================*/
// Get Ad Details List
/*============================================================================*/
private String getDataTable()
String str_HTML="";
try{
SQL= "SELECT ADDETAILS.ADID, ADDETAILS.ADPATH, ADDETAILS.SHOWN, ADDETAILS.CLICKED, ADDETAILS.RATIO, ADDETAILS.EMAIL, ADDETAILS.CATEGORY ";
SQL= SQL + "FROM ADDETAILS ";
statement = connection.createStatement();
resultSet = statement.executeQuery( SQL );
str_HTML = processResultSet( resultSet );
catch ( SQLException sqlex ) {
System.out.println(
"Time stamp [SQL Problem]:" + new Date() +
sqlex.toString());
return str_HTML;
/*============================================================================*/
// Get Ad Details List
/*============================================================================*/
private String getTable()
String str_HTML="";
try
SQL= "SELECT ADDETAILS.ADID, ADDETAILS.ADPATH, ADDETAILS.SHOWN, ADDETAILS.CLICKED, ADDETAILS.RATIO, ADDETAILS.EMAIL, ADDETAILS.CATEGORY ";
SQL= SQL + "FROM ADDETAILS ";
SQL= SQL + "ADID ADDETAILS.ADID";
statement = connection.createStatement();
resultSet = statement.executeQuery( SQL );
str_HTML = processResultSet( resultSet );
catch ( SQLException sqlex ) {
System.out.println(
"Time stamp [SQL Problem]:" + new Date() +
sqlex.toString());
return str_HTML;
/*============================================================================*/
// Ammending details in database
/*============================================================================*/
public int DataAmmend(int A, String adPath, String email, String category) {
//String str_HTML = "";
int result;
int adId = A;
String aadPath = adPath;
String aemail = email;
String acategory = category;
try {
SQL= "UPDATE ADDETAILS SET ADPATH = '" + aadPath + "', EMAIL = '" + aemail + "' CATEGORY = '" + acategory + "' WHERE ADID = " + adId;
statement = connection.createStatement();
result = statement.executeUpdate( SQL );
catch ( SQLException sqlex ) {
System.out.println("Time stamp [SQL Problem]:" + new Date() + sqlex.toString());
return result;
/*============================================================================*/
// Process Ad Details Listing
/*============================================================================*/
private String processResultSet( ResultSet rs ) throws SQLException {
// position to first record
boolean moreRecords = resultSet.next();
// If there are no records, display a message
if ( ! moreRecords ) {
return null;
Vector cols = new Vector();
Vector rows = new Vector();
try
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for (int i = 1; i <= rsmd.getColumnCount(); ++i)
cols.addElement( rsmd.getColumnName(i));
// get row data
do{
rows.addElement( getNextRow( rs, rsmd ) );
}while ( rs.next() );
catch ( SQLException sqlex ) {
System.out.println("Time stamp [Process Reultset]:" + new Date() +
" Exception in Process Results" );
System.out.println("Time stamp [SQL Problem]:" + new Date() +
sqlex.toString());
String str_HTML_TABLE="";
Enumeration enum_Cols = cols.elements();
Enumeration enum_Rows = rows.elements();
StringBuffer buf = new StringBuffer();
buf.append("<tr><td>");
while (enum_Cols.hasMoreElements())
buf.append(enum_Cols.nextElement()).append(" ");
buf.append("</td></tr><tr><td> </td><tr>");
while (enum_Rows.hasMoreElements())
buf.append("<tr><td>" + enum_Rows.nextElement()).append("</td></tr>");
str_HTML_TABLE = str_HTML_TABLE + buf.toString();
return str_HTML_TABLE;
/*============================================================================*/
// Get each row of the to be processed
/*============================================================================*/
private Vector getNextRow( ResultSet rs,ResultSetMetaData rsmd )throws SQLException{
Vector currentRow = new Vector();
for ( int i = 1; i <= rsmd.getColumnCount(); ++i ){
currentRow.addElement( rs.getString( i ) );
return currentRow;
/*============================================================================*/
// Close Database Connection
/*============================================================================*/
public void destroy(){
try{
connection.close();
catch (Exception e){
System.out.println("Problem Closing DB");
} -
Please help!
I have a servlet controller, a javabean for the data and a jsp for the view.
I cannot get the jsp using
<jsp:useBean id="pList" class="bbs.PostListCommand" scope="request" />
to access the bean data
However, when I access the bean in this way
<%@ page import="bbs.PostListCommand" %>
// html
<% bbs.PostListCommand postList = null;
synchronized(session){
postList = (bbs.PostListCommand) session.getAttribute("PostListCommand");
if (postList == null){ %>
<H1>Nothing in request scope to retrieve ....</H1>
<P>
<% }
else{ %>
<TABLE border="1">
// etc
� it works
Does anyone know why the <jsp:useBean> tag does not find the bean
I have installed tomcat 4.18 and set the environmental variables etc.
Directory structure is
E:\Tomcat41\webapps\examples\WEB-INF\jsp for jsp�s
E:\Tomcat41\webapps\examples\WEB-INF\classes\bbs for bean and servlets
Thanks in advance for any help.
ChrisGrayMan - Thanks for your help.
Let me explain my problem in more detail ...
Background:
I have some servlet experience, but I am new to jsp - so sorry if this seems trivial to you ...
I have a book called bitter java by bruce tate from manning.com . I am trying to get the chapter 3 examples to work
There are three files
PostListCommand the bean
PostListController the servlet
PostListResults jsp
And a new test file � PostListResults version 2 with scriptlet code to access the bean.
There are a couple of typos in the downloaded source files, but nothing that causes the main problem of not being able to access the bean data.
Program flow
Servlet instantiates new bean
Bean � gets data from db
Servlet passes bean to jsp with a forward
Jsp outputs data
I have put the files in the directories �
E:\Tomcat41\webapps\examples\WEB-INF\jsp for jsp�s
E:\Tomcat41\webapps\examples\WEB-INF\classes\bbs for bean and servlets
The complete source code for each file is given below.
1 I have checked the db access � that�s ok
2 I have also checked reading the bean data back in from the request scope and printing out the results from within the servlet.- ok
3 I can access the data through a scriptlet (PostListResults version 2), but not with the original PostListResults which uses <jsp:useBean>
thanks in advance, chris
PostListController.java
package bbs;
// Imports
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
// Import for commands used by this class
import bbs.PostListCommand;
public class PostListController
extends javax.servlet.http.HttpServlet
implements Serializable {
* DoGet
* Pass get requests through to PerformTask
public void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws javax.servlet.ServletException, java.io.IOException {
performTask(request, response);
public void performTask(
HttpServletRequest request,
HttpServletResponse response) {
try {
PostListCommand postList = (bbs.PostListCommand) java.beans.Beans.instantiate(getClass().getClassLoader(),"bbs.PostListCommand");
postList.initialize();
postList.execute();
request.setAttribute("PostListCommand", postList);
ServletContext sc = this.getServletContext();
RequestDispatcher rd =
sc.getRequestDispatcher("/jsp/PostListResults.jsp");
rd.forward(request, response);
} catch (Throwable theException) {
theException.printStackTrace();
PostListCommand.java
package bbs;
import java.io.*;
import java.sql.*;
//import COM.ibm.db2.jdbc.*;
import java.util.*;
* Insert the type's description here.
* Creation date: (07/17/2001 5:07:55 PM)
* @author: Administrator
public class PostListCommand {
// Field indexes for command properties
private static final int SUBJECT_COLUMN = 1;
private static final int AUTHOR_COLUMN = 2;
private static final int BOARD_COLUMN = 3;
protected Vector author = new Vector();
protected Vector subject = new Vector();
protected Vector board = new Vector();
// SQL result set
protected ResultSet result;
protected Connection connection = null;
* execute
* This is the work horse method for the command.
* It will execute the query and get the result set.
public void execute()
throws
java.lang.Exception,
java.io.IOException {
try {
// retrieve data from the database
Statement statement = connection.createStatement();
result =
statement.executeQuery("SELECT subject, author, board from posts");
while (result.next()) {
subject.addElement(result.getString(SUBJECT_COLUMN));
author.addElement(result.getString(AUTHOR_COLUMN));
board.addElement(result.getString(BOARD_COLUMN));
result.close();
statement.close();
} catch (Throwable theException) {
theException.printStackTrace();
* getAuthor
* This method will get the author property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getAuthor(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) author.elementAt(index);
* getBoard
* This method will get the board property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getBoard(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) board.elementAt(index);
* getSubject
* This method will get the subject property.
* Since the SQL statement returns a result set,
* we will index the result.
public String getSubject(int index)
throws
java.lang.IndexOutOfBoundsException,
java.lang.ArrayIndexOutOfBoundsException {
return (String) subject.elementAt(index);
* initialize
* This method will connect to the database.
public void initialize()
throws java.io.IOException {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
// URL is jdbc:db2:dbname
String url = "jdbc:db2:board";
// URL is jdbc:odbc:bitter3board
String url = "jdbc:odbc:bitter3board";
// connect with default id/password
connection = DriverManager.getConnection(url);
} catch (Throwable theException) {
theException.printStackTrace();
* Insert the method's description here.
* Creation date: (07/17/2001 11:38:44 PM)
* @return int
* @exception java.lang.IndexOutOfBoundsException The exception description.
public int getSize() {
return author.size();
PostListResults.jsp
<HTML>
<HEAD>
<TITLE>Message Board Posts</TITLE>
</HEAD>
<BODY BGCOLOR=#C0C0C0>
<H1>All Messages</H1>
<P>
<jsp:useBean id="postList" class="bbs.PostListCommand" scope="request"></jsp:useBean>
<TABLE border="1">
<TR>
<TD>Subject</TD>
<TD>Author</TD>
<TD>Board</TD>
</TR>
<% for (int i=0; i < postList.getSize(); _i++) { %>
<TR> <TD><%=postList.getSubject(_i) %></TD>
<TD><%=postList.getAuthor(_i) %></TD>
<TD><%=postList.getBoard(_i) %></TD>
</TR>
<% } %>
</TABLE>
<P>
</BODY>
</HTML>
PostListResults.jsp version 2 � with scriplet code instead of useBean
<HTML>
<%@ page import="bbs.PostListCommand" %>
<!-- This file was generated by the chris -->
<HEAD>
<TITLE>Message Board Posts</TITLE>
</HEAD>
<BODY BGCOLOR=#C0C0C0>
<% bbs.PostListCommand postList = null;
synchronized(request){
postList = (bbs.PostListCommand) request.getAttribute("PostListCommand");
if (postList == null){ %>
<H1>Nothing in request scope to retrieve ....</H1>
<P>
<% }
else{ %>
<TABLE border="1">
<TR>
<TD>Subject</TD>
<TD>Author</TD>
<TD>Board</TD>
</TR>
<% for (int i=0; i < postList.getSize(); _i++) { %>
<TR> <TD><%=postList.getSubject(_i) %></TD>
<TD><%=postList.getAuthor(_i) %></TD>
<TD><%=postList.getBoard(_i) %></TD>
</TR>
<% } %>
</TABLE>
<% }
}%>
<P>
goodnight
</BODY>
</HTML> -
Distributed transactions/jdbc problem WL60
Hi
Our company has aworking application running on WLS5.1sp9.
Im in the process of migrating it to WL6.0sp2.
Our domain has 2 clusters each running 2 servers:
1) servlet engines (handling http requests from clients, running servlets
and jsp's)
2) ejb containers (runnigour entities and session beans, working with Oracle
8i database using connection pool and TxDataSource)
The scenario:
- a client request invokes a servlet on one of the servlet engines.
- the servlet opens a jndi context to one of the ejb containers
- the servlet open a transaction on a UserTransaction stub on that ejb.
- then the servlet calls an entity bean using a home interface looked up
using the same context.
- the entity bean uses DataSource lookup in its own servers jndi to rerieve
a connection.
and then i get the following exception:
java.sql.SQLException: No default driver for database type:
jdbc:weblogic:jts
at
weblogic.jdbcbase.t3.Driver.seeIfWeNeedToInferDriverNameAndUrlFrom(Driver.ja
va:456)
at weblogic.jdbcbase.t3.Driver.getAllPropsFrom(Driver.java:255)
at weblogic.jdbcbase.t3.Driver.connect(Driver.java:75)
at weblogic.jdbcbase.jts.Driver.createRemoteConnection(Driver.java:199)
at weblogic.jdbcbase.jts.Driver.connect(Driver.java:134)
at
weblogic.jdbc.common.internal.RmiDataSource.getConnection(RmiDataSource.java
:44)
at com.unisfair.util.DBHelper.getConnection(DBHelper.java:43)
the transaction toString() gives:
transaction=(IdHash=7541556,Name = [EJB
UserBeanImpl.generateSessionSuffix()],Xid=2:b53da78d3c1badbb,Status=Active,n
umRepliesOwedMe=0,numRepliesOwedOthers=1,seconds since begin=0,seconds
left=30,activeThread=Thread[ExecuteThread: '8' for queue: 'default',5,Thread
Group for Queue:
'default'],ServerResourceInfo[weblogic.jdbc.jts.Connection]=(state=new,assig
ned=none),SCInfo[ejb2]=(state=active),SCInfo[servlet2]=(state=active),SCInfo
[ejb1]=(state=active),properties=({weblogic.transaction.name=[EJB
UserBeanImpl.generateSessionSuffix()], weblogic.jdbc=t3://10.0.0.31:7007}))
However the error happens on the other ejb server 10.0.0.33:7007
It seems that the jts driver tries to get a remote connection on the server
that coordinates the transaction but uses the deprecated t3 driver.
I hope someone can help us since this problem is a good enough reason for us
not moving on to WL6.0 we also looked at WL6.1 Beta and theres nothing new
about it either.
thanks
Dror Last
Senior Software Engineer
Unisfair Inc.
12 Yad Haruzim St. Tel Aviv 67778 Israel
Tel: +972-3-5373738 Ext. 243
Fax: +972-3-5373731
GSM: +972-55-723710
mailto:[email protected]
http://www.unisfair.com/
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by JDBC_TX ():
In the readme file of Oracle JDBC drivers 8.1.6.0.1 (http://technet.oracle.com/software/tech/java/sqlj_jdbc/files/Readme_01.txt)
it mentioned that it supports "distributed transactions".
As I understand, JDBC transaction is connection based and uses Oracle internal transaction manager. In order to do "distributed transactions", I must have at least two connections open at the same time each to its own database instance. How does the two connections coordinate the transactions? I thought in order to support "distributed transactions", one has to build a higher layer to encapsulate the two connections and therefore coordinate the distributed transactions. Any examples will be welcome.<HR></BLOCKQUOTE>
The two branches of the transaction are coordinated using 2-phase commit.
For samples look under
$ORACLE_HOME/jdbc/demo/samples/oci8/jdbc20-samples/
null -
Hi!
We're using Informix 7 + WL6sp1 + Informix JDBC Driver v2.2. We have a connection
pool and connect to the pool using:
Driver myDriver = (Driver) Class.forName("weblogic.jdbc.pool.Driver").newInstance();
con = DriverManager.getConnection("jdbc:weblogic:pool:poolname");
The problem is as follows:
Every time we modify a stored procedure (DROP ... CREATE ...) our app fails when
trying to use that stored procedure. We have to shut down the server and restart
it in order to keep going.
The stack trace:
java.sql.SQLException: SPL routine(disponibilidad_hot) is no longer valid.
at com.informix.jdbc.IfxSqli.addException(IfxSqli.java, Compiled Code)
at com.informix.jdbc.IfxSqli.receiveError(IfxSqli.java, Compiled Code)
at com.informix.jdbc.IfxSqli.dispatchMsg(IfxSqli.java, Compiled Code)
at com.informix.jdbc.IfxSqli.receiveMessage(IfxSqli.java, Compiled Code)
at com.informix.jdbc.IfxSqli.sendStatementQuery(IfxSqli.java, Compiled
Code)
at com.informix.jdbc.IfxSqli.executeStatementQuery(IfxSqli.java, Compiled
Code)
at com.informix.jdbc.IfxSqli.executeStatementQuery(IfxSqli.java, Compiled
Code)
at com.informix.jdbc.IfxResultSet.executeQuery(IfxResultSet.java, Compiled
Code)
at com.informix.jdbc.IfxStatement.executeQueryImpl(IfxStatement.java,
Compiled Code)
at com.informix.jdbc.IfxPreparedStatement.executeQuery(IfxPreparedStatement.java,
Compiled Code)
at weblogic.jdbc.pool.PreparedStatement.executeQuery(PreparedStatement.java,
Compiled Code)
at es.gesfor.bd.ObtenerDatos.ejecutar(ObtenerDatos.java, Compiled Code)
at es.gesfor.servlets.FiltrosServlet.obtenerHoteles(FiltrosServlet.java,
Compiled Code)
at es.gesfor.servlets.FiltrosServlet.doPost(FiltrosServlet.java, Compiled
Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java,
Compiled Code)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java,
Compiled Code)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java,
Compiled Code)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java, Compiled
Code)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, Compiled Code)Hi Federico,
It happens because weblogic caches prepred statements.
Though the name of the stored procedure remains the same,
it's a different object from the database point of view, which is
why a mismatch between cache and database occurs.
You may consider setting size of the prepared statement
cache to zero. That should solve the problem. Later, when
the SP code is stabilized, you will be able to turn in on back.
Regards,
Slava Imeshev
"Federico Dios" <[email protected]> wrote in message
news:[email protected]...
>
Hi!
We're using Informix 7 + WL6sp1 + Informix JDBC Driver v2.2. We have aconnection
pool and connect to the pool using:
Driver myDriver = (Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
con = DriverManager.getConnection("jdbc:weblogic:pool:poolname");
The problem is as follows:
Every time we modify a stored procedure (DROP ... CREATE ...) our appfails when
trying to use that stored procedure. We have to shut down the server andrestart
it in order to keep going.
The stack trace:
java.sql.SQLException: SPL routine(disponibilidad_hot) is no longer valid.
at com.informix.jdbc.IfxSqli.addException(IfxSqli.java, CompiledCode)
at com.informix.jdbc.IfxSqli.receiveError(IfxSqli.java, CompiledCode)
at com.informix.jdbc.IfxSqli.dispatchMsg(IfxSqli.java, CompiledCode)
at com.informix.jdbc.IfxSqli.receiveMessage(IfxSqli.java, CompiledCode)
at com.informix.jdbc.IfxSqli.sendStatementQuery(IfxSqli.java,Compiled
Code)
at com.informix.jdbc.IfxSqli.executeStatementQuery(IfxSqli.java,Compiled
Code)
at com.informix.jdbc.IfxSqli.executeStatementQuery(IfxSqli.java,Compiled
Code)
at com.informix.jdbc.IfxResultSet.executeQuery(IfxResultSet.java,Compiled
Code)
atcom.informix.jdbc.IfxStatement.executeQueryImpl(IfxStatement.java,
Compiled Code)
atcom.informix.jdbc.IfxPreparedStatement.executeQuery(IfxPreparedStatement.jav
a,
Compiled Code)
atweblogic.jdbc.pool.PreparedStatement.executeQuery(PreparedStatement.java,
Compiled Code)
at es.gesfor.bd.ObtenerDatos.ejecutar(ObtenerDatos.java, CompiledCode)
ates.gesfor.servlets.FiltrosServlet.obtenerHoteles(FiltrosServlet.java,
Compiled Code)
at es.gesfor.servlets.FiltrosServlet.doPost(FiltrosServlet.java,Compiled
Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java,Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java,Compiled Code)
atweblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
Compiled Code)
atweblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java,
Compiled Code)
atweblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
Compiled Code)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java,Compiled
Code)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java, CompiledCode) -
Can anyone please help me with pointing to the right direction on webapplications.
I have a table in the database that returns 50K rows when running a query. I have been reading through some books and forums, SDN including that a correct way to access the database is through the Business tier EJB session beans and JPA and access these objects from Servlets. I understand that and I have an example that works using paging so I do not need to send all 50K records at once. My question is, the resultset retrieves entity objects and I have to create data transfer objects for each one of them to send to the GWT client? Doesn't it mean I have twice as much objects in the memory at a time to compare with accessing database through JDBC from Servlets directly? In the later case I wouldn't have any entity objects and occupy less memory? Is it completely wrong idea?
Thanksmambo_jumbo wrote:
Without their superpowers some of them are still not serializable for GWT.
Never mind,
Thanks for answer.I don't understand what the problem is here.
Dod you have a problem with making them Serializable? They have to be Serializable if you want to make them arguments to remote methods anyway.
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