What should I take note when converting Servlets to JSPs files?
Hi Everyone,
I have a web application that currently runs using Servlets and JSP, but i intend to change every servlet file into JSP.
What should I take note?
Please advice and comment.
Thanks in advance
Ok, I can see your logic, but I don't agree with it.
It may SEEM like you'll save time, but I'm pretty sure you wouldn't in the end.
So you don't have to restart the Tomcat server so much.
That still doesn't justify writing java code into a JSP.
Whatever you gain from not restarting the server you will lose 10 times over from stupid compile errors/typos that come from writing scriptlet code in a JSP.
Java code belongs in a java class, where you can take advantage of all of the assistance of the IDE for code completion, formatting, compiling, syntax checking etc.
Also if you write your code in classes, you can test them with Junit tests - something harder to do when your logic is embedded in JSPs
Write your java code where it is meant to be. In java classes. Beans/Servlets/whatever.
A JSP is for one purpose only - to produce an HTML page.
Just my 2 cents.
evnafets
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What should be take action against following sql tuning report.
Hi
what should be take action against following sql tuning report.
SQL ID : fn3mt5dvm7fba
SQL Text : SELECT * FROM (select
to_number(ow.waybl_no) waybl_no,ow.id wb_id,
To_Number(ogp.gp_no) gp_no,
To_Number(ots.trip_sht_no) trip_sht_no,
otr.nm,
ots.gty_br_mast_id,
DECODE(otr.sign_recd,'1','YES','NO') Sign_Recd,
DECODE(otr.stamped,'1','YES','NO') Stamped,
otr.dlvry_dt dlvry_dt,
otr.tel_no,
--otr.remarks,
Decode(otr.comments, NULL,'','Yes') remarks,
otr.id ID,ops_safex_utl.get_br_nm(to_number(ow.bkg_br_mast_id))
book_br,
ow.pick_dt book_date
from
ops_ts_reconsile otr,
ops_pultd_wb_dtls opuwd,
ops_trip_sht ots,
ops_waybl ow,
ops_ultd_wb_dtls ouwd,
ops_gate_pass ogp
where
otr.trip_sht_id=ots.id and
otr.pultd_wb_dtls_id=opuwd.id and
opuwd.ultd_wb_dtls_id=ouwd.id and
ouwd.gate_pass_id=ogp.id and
opuwd.waybl_id=ow.id and
otr.status_lid=157 and
ots.gty_br_mast_id = (:br_Id) and
(otr.dlvry_dt = :searchDate OR :searchDate IS NULL) and
otr.note_prpd = 'N' and otr.pod_recd = '1' and
not exists (select TS_RECONSILE_ID from OPS_POD_FRWD_NOTE_DTLS
where TS_RECONSILE_ID = otr.id)
union
select
to_number(ow.waybl_no) waybl_no, ow.id wb_id,
To_Number(ogp.gp_no) gp_no,
null trip_sht_no,
ogr.nm,
ogp.dlvry_br_mast_id,
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book_br,
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Bind Variables :
1 - (VARCHAR2(32)):37069
2 - (DATE):07/11/2011 00:00:00
3 - (DATE):07/11/2011 00:00:00
4 - (VARCHAR2(32)):37069
5 - (DATE):07/11/2011 00:00:00
FINDINGS SECTION (3 findings)
1- SQL Profile Finding (see explain plans section below)
2 potentially better execution plans were found for this statement. Choose
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Recommendation (estimated benefit<=10%)
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execute dbms_sqltune.accept_sql_profile(task_name => 'TASK_58643',
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The following data shows some sampled statistics for this SQL from the past
week and projected weekly values when parallel execution is enabled.
Past week sampled statistics for this SQL
Number of executions 17494
Percent of total activity 7.2
Percent of samples with #Active Sessions > 2*CPU .63
Weekly DB time (in sec) 614696.04
Projected statistics with Parallel Execution
Weekly DB time (in sec) 704166.9
2- Restructure SQL finding (see plan 1 in explain plans section)
An expensive "UNION" operation was found at line ID 4 of the execution plan.
Recommendation
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3- Alternative Plan Finding
Some alternative execution plans for this statement were found by searching
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id plan hash last seen elapsed (s) origin note
1 209247904 2011-07-12/10:09:08 7.564 Cursor Cache
2 4029269565 2011-07-12/10:20:21 15.374 Cursor Cache original plan
3 4128886984 2011-07-08/11:30:25 42.426 AWR
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Hi
what should be take action against following sql tuning report.
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HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
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org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
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org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
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org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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Apache Tomcat/5.5.9***********************************************************************************************************
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<!-- ***** File Name Test.jsp ***** -->
<%@ import="Login.connectionBean" %>
<%@ language="java" %>
<%@ import="java.io.*" %>
<%@ import="java.sql.*" %>
<%@ import="javax.sql.*" %>
<jsp:useBean id="sq" scope="page" class="Login.connectionBean" type="connectionBean"/>
<jsp:setProperty name="sq" property="*"/>
<html>
<!-- DW6 -->
<head>
<!-- Copyright 2005 Macromedia, Inc. All rights reserved. -->
<title>Registration Form</title>
</head>
<body>
<form name="Test" action="Registration_DB.jsp" method="get">
<table width="100%" border="0">
<tr>
<td colspan="5"></td>
</tr>
<tr>
<td width="10%" height="250"></td>
<td width="90%" colspan="4"><div align="center">
<table width="437" border="1">
<tr>
<td><div align="center">User ID </div></td>
<td> </td>
<td><div align="center">
<input name="User_ID" type="text" size="25" maxlength="25" />
</div></td>
</tr>
<tr>
<td><div align="center"></div></td>
<td> </td>
<td><div align="center"></div></td>
</tr>
<tr>
<td width="149"><div align="center">User name </div></td>
<td width="27"> </td>
<td width="239"><div align="center">
<input name="User_Name" type="text" size="25" maxlength="25" />
</div></td>
</tr>
<tr>
<td><div align="center"></div></td>
<td><div align="center"></div></td>
<td><div align="center"></div></td>
</tr>
<tr>
<td><div align="center">Password</div></td>
<td> </td>
<td><div align="center">
<input name="Password" type="text" size="25" maxlength="25" />
</div>
</td>
</tr>
<tr>
<td><div align="center"></div></td>
<td> </td>
<td><div align="center"></div></td>
</tr>
<tr>
<td><div align="center">
<input name="Button_Reset" type="reset" value="Reset Fields" />
</div></td>
<td> </td>
<td><div align="center">
<input name="Button_Submit" type="reset" value="Submit Details" />
<%
String User_Id=request.getParameter("User_Id")
String User_Name="";
String Password="";
%>
<%
try
sq.connect();
if(user_Id!==null && User_Id!="")
ResultSet rs2.sq.execQuery("select User_Name FROM User_Login where User_Id='"+User_Id+"'");
catch(Exception e)
out.println("Exception Caught" +e);
e.printStackTrace();
%>
</div></td>
</tr>
</table>
</div></td>
</tr>
</table>
</form>
</body>
</html>***********************************************************************************************************
File Name Registration_DB.jsp
<!-- ***** File Name Test_DB.jsp ***** -->
<%@ language="java" %>
<%@ import="Login.connectionBean" %>
<%@ import="java.sql.*" %>
<%@ import="javax.sql.*" %>
<%@ import="java.io.*" %>
<jsp:useBean id="sq" scope="page" class="Login.connectionBean" type="connectionBean"/>
<jsp:setProperty name="sq" property="*"/>
<html>
<head>
<title>Untitled Document</title>
</head>
<body>
<%
String Button_Submit = request.getParameter("Button_Submit");
String User_Id = request.getParameter("User_Id");
String User_Name = request.getParameter("User_Name");
String Password = request.getParameter("Password");
%>
<%!
ResultSet rs1=null;
ResultSet rs2=null;
%>
<%
try
sq.connect();
if(Button_Submit!=null && Button_Submit!="")
String qry="INSERT INTO User_Login (User_Id, User_Name, Password) VALUES('"+User_Id+"','"+User_Name+"','"+Password+"')";
int i=sq.executeUpdae(qry);
if (i>0)
response.sendRedirect("Registration.jsp");
catch(Exception e)
out.println("Exception Caught" +e);
e.printStackTrace();
%>
</body>
</html>***********************************************************************************************************
File name connectionBean.java
package Login;
import java.sql.*;
public class connectionBean
private Connection con;
public connectionBean()
super();
public boolean connect() throws ClassNotFoundException, SQLException
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:JAVA"," "," ");
return true;
public void close() throws SQLException
con.close();
public ResultSet execQuery(String qry) throws SQLException
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(qry);
return(rs==null)?null:rs;
public int execUpdae(String qry) throws SQLException
Statement stmt=con.createStatement();
int i=stmt.executeUpdate(qry);
return(i==0)?0:i;
}hi
here the problem is tat the server culdnt find the class for u page,
check u hav deployed it properly or not,
check the tomcat installation and is it working fine,
regards
venkat -
Java class bean can not access to DB in JSP file
Hi, I wrote a java class bean in order to access to MySql database ,and this bean is used in a JSP file,so that the bean can query from DB and then display the queried information on the JSP file,but it can not work correctly,the following is the source code and error message popup by the system,
does anybody has experience in solving thus question,Please reply ,Thank you for your help.
%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import = "java.sql.*" %>
<jsp:useBean id="conn" scope="page" class="news.conn"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>1</title>
<style>
<!--
A:link {
COLOR: #993399
.s {
FONT-SIZE: 13px; LINE-HEIGHT: 170%; FONT-FAMILY: "utf-8"
-->
</style>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1">
<tr>
<td width="100%">
<img border="0" src="images/ruanjian.jpg" width="770" height="154"></td>
</tr>
<tr>
<td width="100%">@</td>
</tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber2">
<tr>
<td width="13%">@</td>
<td width="87%">
<img border="0" src="images/mid-rdxw2.gif" width="101" height="18"><p>
<%
ResultSet rs,rsNest;
String strSql=null;
strSql = "select * from news where TYPE=1";
rs = conn.executeQuery(strSql);
while (rs.next()){
%>
<span class="s"> <a href="newsContent.jsp?newsId=<%=rs.getInt(id")%">"><%=rs.getString("Title")%></a><br>
<%
%>
<p>
<img border="0" src="images/mid-hyxw2.gif" width="94" height="19"></p>
<%
strSql="select * from news where TYPE=2";
rs = conn.executeQuery(strSql);
while (rs.next()){
%>
<span class="s"> <a href="newsContent.jsp?newsId=<%=rs.getInt("id")%>"><%=rs.getString("Title")%></a><br>
<%
%>
<p>@</td>
</tr>
</table>
<p align="center">Study Online</p>
<p align="center">@</p>
</body>
</html>
Error message:
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: /newsMain.jsp:47
44: strSql = "select * from news where TYPE=1";
45: rs = conn.executeQuery(strSql);
46:
47: while (rs.next()){
48:
49: %>
50:
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
org.apache.jsp.newsMain_jsp._jspService(newsMain_jsp.java:98)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.27 l</a>nogoodatcoding wrote:
Tolls wrote:
Is that Jasper Exception telling us where the problem is in the jsp, though?
If it is, then "rs" is null in the call rs.next()...which means conn.executeQuery() is returning null. Which means that whatever class conn is (news.conn?) has a problem maybe?That's possible. Though, it may just be the case that the 'conn' object itself is null! That line is the first place where it's being used and there are no checks that I can see...we'll have to wait for the OP to investigate and reply I guess.That's what I originally thought, then I noticed it was saying line 47, which is the rs.next() line. Assuming Jasper is correct in its choice of line, then it's the rs that's null. Which means the conn is doing strange things.
Edit: Now that I think about it, going by the previous thread the OP posted, I'm wondering whether news.conn class is their attempt to move the JDBC stuff out of the JSP page, and it's grabbing the "real" connection (java.sql.Connection) and getting the result set and returning it...or getting something wrong and returning null.
Edited by: Tolls on 11-Jun-2009 12:24
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