Best JSP/Beans Practices

I am setting up a very simple guestbook using JSP. I have a GuestBean in which I set the info passed from the <form>. Is it best practice to have a separate bean for db connection and inserting the info or can I do it all in one bean?
If separate is the better route, do I add a <jsp:useBean> tag in my JSP page to instantiate an instance of the db connection/insert bean?
Input greatly appreciated....Thanks!

From my own expierence, the best way to handle database connections is to let the Web Container handle them. I usually have the bean do a JNDI lookup each time it needs a connection. This seperates the bean from any database connection logic. It also gives you the flexibility of changing eitehr the connection method or the database server without having to modify your bean code.
- Chris

Similar Messages

  • Prob with running jsp Bean

    Hi,
    I am trying to run a bean through a jsp but its giving error at useBean tag of jsp:
    The error is :
    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: /Quadratic.jsp(7,0) The value for the useBean class attribute com.brainysoftware.Quadratic is invalid.
         org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
         org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:409)
         org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:150)
         org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1227)
         org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
         org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
         org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
         org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
         org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
         org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
         org.apache.jasper.compiler.Generator.generate(Generator.java:3272)
         org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:244)
         org.apache.jasper.compiler.Compiler.compile(Compiler.java:470)
         org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
         org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
         org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
         org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
         org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
         org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
         javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    My jsp is:
    <HTML>
    <HEAD>
    <TITLE> JSP BEAN Quadratic Example </TITLE>
    </HEAD>
    <BODY>
    <%@ page language="java" %>
    <jsp:useBean id="quadratic" scope="session" class="com.brainysoftware.Quadratic" />
    <jsp:setProperty name="quadratic" property="ia" param="a" />
    <jsp:setProperty name="quadratic" property="ib" param="b" />
    <jsp:setProperty name="quadratic" property="ic" param="c" />
    X1= <%= quad.getDx1( ) %>
    X2= <%= quad.getDx2( ) %>
    End of program
    </BODY>
    </HTML>my bean is:
    package com.brainysoftware;
    import java.io.*;
    class Quadratic{
    int ia;
    int ib;
    int ic;
    String dx1;
    String dx2;
    public int getIa( ) {
    return ia;
    public void setIa( int ii) {
    ia=ii;
    public int getIb( ) {
    return ib;
    public void setIb(int ii) {
    ib=ii;
    public int getIc( ) {
    return ic;
    public void setIc(int ii) {
    ic=ii;
    public String getDx1( ) {
    double detA;
    double result;
    detA= ib*ib -4*ia*ic;
    if(detA<0.0)
    return "Real Roots not possible";
    else {
    result= -ib - Math.sqrt(detA/(2 * ia));
    Double Dresult=new Double (result);
    return Dresult.toString( );
    public String getDx2( ) {
    double detA;
    double result;
    detA= ib*ib -4*ia*ic;
    if(detA<0.0)
    return "Real Roots not possible";
    else {
    result= -ib + Math.sqrt(detA/(2 * ia));
    Double Dresult=new Double (result);
    return Dresult.toString( );
    my directory structure is given below:
    C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-INF\classes\com\
    brainysoftware>dir
    Volume in drive C has no label.
    Volume Serial Number is 4C50-9542
    Directory of C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-IN
    F\classes\com\brainysoftware
    05/22/2005 11:15 PM <DIR> .
    05/22/2005 11:15 PM <DIR> ..
    05/22/2005 11:18 PM 134 CalculatorBean.java
    05/23/2005 12:12 AM 216 Counter.java
    05/24/2005 10:48 PM 358 SimpleJavaBean.java
    06/14/2005 11:16 PM 1,205 Calculator.java
    06/14/2005 11:16 PM 1,323 Calculator.class
    06/16/2005 06:44 PM 534 CalculatorBean2.java
    06/17/2005 08:53 AM 703 CalculatorBean2.class
    06/16/2005 07:00 PM 352 CalculatorBean2.html
    06/17/2005 08:51 AM 588 CalculatorBean2.jsp
    06/17/2005 04:29 PM 97 UploadBean.java
    06/17/2005 04:43 PM 527 FileUploadBean.java
    06/17/2005 04:43 PM 834 FileUploadBean.class
    06/18/2005 12:21 PM 863 Quadratic.java
    06/18/2005 12:21 PM 1,093 Quadratic.class
    14 File(s) 8,827 bytes
    2 Dir(s) 8,615,821,312 bytes free
    C:\tomcat-5.0.28\jakarta-tomcat-5.0.28\webapps\jsp-examples\WEB-INF\classes\com\
    brainysoftware>
    The above clearly shows the presence of Bean in the reqd directory but still I am getting an error. Can somebody help me:
    Zulfi.

    class QuadraticThe class is not public. It is only visible to other classes in the same package as itself, so the servlet (JSP) trying to instantiate and reference it can't see it.
    Make it public.

  • Web Service Best and Worst Practices within Oracle SOA Suite

    Hi All,
    Has anybody got a single document that concisely details the best and worst practices around the design of web services for oracle SOA and BPEL.
    I'm interested the following aspects
    1. Level of Granularity
    2. Level of Reuse
    3. BPEL orchestration. numbers of BPEL process vs services
    4. Transport choices...SOAP vs REST vs Big Services etc
    5. Activity Monitoring with BAM
    6. Future proofing of signatures and ongoing maintenance and process change
    I'm constructing a document myself to share on this forum, but i'd be very interested to use the wisdom of others if somebody has done this before...
    Thanks in advance :)

    This is a question best answered by your Oracle reseller or Oracle account manager to give you all the details but I hope this brief answer helps:
    - The Unified Business Process Management Suite (BPM Suite 11g) includes: BPM Studio, BPM Composer, BPMN Service Engine and Workflow Extensions, BPM Process Spaces, and BPM Process Analytics.
    - BPM Suite 11g requires the licensing of SOA Suite 11g for Oracle Middleware which requires a license for WebLogic Suite.
    - You can license SOA Suite 11g now and license BPM Suite 11g later.
    Since the products are layered, I don't see this cutting into SOA sales at all. My personal view is that BPM on top of SOA is brilliant since it provides easy integration between human and automated tasks, builds on many of the SOA concepts that are key for a successful BPM implementation (functional, not the Oracle product), and uses the same IDE. The synergies extend past easy use of services; the same business rules and human workflow components are used between both products.

  • Best APEX developing practices?

    Hello,
    I have a simple question - What are the best APEX developing practices in regards to developing workspaces ?
    There are two ways to develop in APEX (when you create an application for internal use, of cause) :
    One is to have a workspace per Application - Meaning that you have Developing, Test and Production Application in the same Workspace, and this Workspace would be reserved to one application only. The advantage of this approach is that it is easy to move ready pages (or even the whole application) from Developing to Production - You can simply copy ready pages from one application to another.
    The other one is to have a Workspace per Environment - Meaning that you have all your Production applications in one Workspace and all the Development application in another Workspace. In this case, when you have to move a page to Production, you have to export it, and import it to another Workspace. The advantage of this approach is security - you don't work in production...
    So I wanted to ask APEX gurus - What is your opinion on that? Are there any Oracle standards for developing in APEX? What is your best working experience in regards to developing applications in APEX, etc..??
    Thank you!

    Hi Sloger
    Keep it simple DEV, TEST and PROD are on separate database instances, preferably on separate servers.
    If you only have one box, then develop your app on your PC using XE.
    You can have the same workspace id on multiple databases, allowing you to promote between databases easily using SQL*Plus.
    As far as on app per workspace, that's entirely up to you.
    Multiple applications in a single workspace work very well - after all this is how the APEX team builds the Application Builder.
    Regards
    Mark
    demo: http://apex.oracle.com/pls/otn/f?p=200801 |
    blog: http://oracleinsights.blogspot.com |
    book: https://www.packtpub.com/oracle-application-express-4-0-with-ext-js/book

  • NEWBIE SUPER EASY JSP / BEAN

    With about half a dozen books sitting around my desk, I can't get a REAL basic jsp to work. I FINALLY got tomcat to NOT give run time errors, however the web page simply outputs "This is output:" I know I am an idiot, but this JSP / bean stuff is upsetting. Any help on the following code would be great.
    basic.jsp is as follows:
    <jsp:useBean id="myBean" class="basic.basicbean" scope="session"/>
    <html>
    <head>
    <title>
    A Simple JSP
    </title>
    </head>
    <body>
    <%
    myBean.setBasicName("Michelle");
    %>
    This is output: <% myBean.getBasicName();%>
    </body>
    </html>
    basicbean.java is as follows:
    package basic;
    import java.beans.*;
    public class basicbean {
    private String BasicName=null;
    /** Creates new basicbean */
    public basicbean() {}
    public String getBasicName() {
    return this.BasicName;
    public void setBasicName(String value) {
    this.BasicName = value;
    Made the .java into the class put it in the basic directory under the classes/basic directory of the WEB-INF. The JSP page loads, but only output is: "This is output:" I am using Tomcat as the JSP server. "Core JSP" "Core Servlets and JavaServer Pages" "Advanced JavaServer Pages" "JSP, Servlets, and MySQL", and "Java Server Pages for Dummies" and I still can't get it. Thanks for helping out an idiot.
    -Jim

    You are very close; just a small error in the line:
    This is output: <% myBean.getBasicName();%>
    The problem is your just simply calling the method and tossing the return value. You have three ways of outputing the bean property:
    This is output: <% out.print(myBean.getBasicName();%>
    or
    This is output: <%=myBean.getBasicName()%>
    or
    This is output: <jsp:getProperty name="myBean" property="BasicName" />
    If you use the <jsp:getProperty> approach, then you must have a <jsp:useBean> somewhere above the getProperty tag.
    - Chris

  • Redundant information in JSP bean action

    Class Person:
    public class Person{
    private String name;
    public void setName(String p){
    name=p;
    public String getName(){
    return name;
    }Code in servlet:
    public void doPost(HTTPServletRequest request, HTTPServletResponse response) throws IOException,ServletException{
    foo.Person p= new foo.Person();
    p.setName("New Guy");
    request.setAttribute("person",p);
    RequestDispatcher view = request.getRequestDispatcher("result.jsp");
    view.forward(request,response);
    }Code in JSP:
    <jsp:useBean id="person" class="foo.Person" scope="request">This jsp:useBean tag really is confusing. Why does it need to declare the class="foo.Person"? Why does the JSP need to know that "person" instance is derived from class foo.Person ? (I wonder if I changed this to foo.person --> not Person will result in error). Doesn't the statement request.setAttribute("person",p) from the servlet give enough info already to the JSP? thanks

    The "person" in your servlet has nothing to do with your "person" in your JSP bean tag.

  • Create jsp/bean webapp deploy fine...  add JSTL library wont deploy!

    winxp
    SJSE8
    PROBLEM:
    Using the new project wizard, I create a simple jsp/bean webapp using the embedded tomcat 5.5.7 as server... It deploys and runs with now issue
    Then, I right-click on project name (in project tree)... click properties... add library... select "JSTL 1.1".... do clean/build.... do deploy - which fails!
    message is: "Failed to deploy application at context path /bcd" (where bcd is my project name)
    Why does this happen?
    --------------simple app---------------
    ***jsp1.jsp****
    <%@page contentType="text/html"%>
    <%@page pageEncoding="UTF-8"%>
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
       "http://www.w3.org/TR/html4/loose.dtd">
    <html>
        <head>
            <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
            <title>JSP Page</title>
        </head>
        <body>
        <h1>JSP Page</h1>
        <h1>get stuff JSP Page</h1>
        <jsp:useBean id="a" class="bcdpkg.IndexBean" scope="request"/>
        <h3>after1...</h3>
        <!--jsp:setProperty name="a" property="stuff" value="xxx" /-->
        <jsp:getProperty name="a" property="stuff" />
        </body>
    </html>***IndexBean.java***
    package bcdpkg;
    public class IndexBean
        /** Creates a new instance of IndexBean */
        public IndexBean()
        private String stuff = "this is stuff";
        public String getStuff()
            return this.stuff;
        public void setStuff(String s)
            this.stuff = s;
    }

    well.... I restarted SJSE8 (and tomcat 5.5.7) and now I can right-click on the project and click deploy...successfully.
    (Apologies for the "hair trigger" posting)
    I'll reply once more if it happens again.
    thanx

  • Redirect from jsp bean to jsp or html page

    I am facing a problem in redirecting to a jsp page from jsp bean
    How do i redirect from jsp bean to any other page like jsp or html.
    [email protected]

    Hi
    The solution you suggested we tried it long before only but it is not feasible for us as we have to implement it in all web pages which are in thousands.
    My need is like this.
    We have given specific time to each of our registered user , as user logs to our portal we calculate session time in bean and as he logs out is new time gets updated. (its like dial up connection)
    Now what happens consider user has left only 10 minutes balance, I can calculate and keep track for his time in bean.Now as the time becomes zero I want to redirect him to home page.
    As u said i can get return value zero for bean and can do it ,but our webpages are near about thousands.

  • Javascript array / jsp Bean Collection

    How can you fill a javascript array with the values of the collection?
    <jsp:useBean id="programs" scope="request" class="java.util.Collection"/>
      How can I create this array?
    <script language="JavaScript" type="text/javascript">
    var programData =
    new Array ( new Array "${programs[1].programId}","${programs[1].programName}", "${programs[1].department}"),  
                 new Array "${programs[2].programId}","${programs[2].programName}", "${programs[2].department}"),
    </script>

    I answered myself. If anyone else would like to know how to fill a javascript array with the values of a jsp beans collection.
    function collectionToArray()
    Array[rows] = [4];  
    var cnt = 0;
    <c:forEach var="sp" items="${programs}">
      rows[cnt][0] = ${sp.programId};
      rows[cnt][1] = ${sp.programName};
      rows[cnt][2] = ${sp.department};
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      rows[cnt][4] = ${sp.urlLink2};
      cnt++;
    </c:forEach>  
    }

  • Best JSP Editor

    Hi,
    Recently I've been looking for a really good JSP editor. I wanted syntax coloring and auto completion for jsp, html, and javascript. I also wanted the editor to run quickly and have a lot of efficient key input features. I tried ... Forte, Visual Age, JDeveloper, JBuilder, JCreator, HomeSite, JPad, NetBeans, JIdea (I think that's the name), and about 4 other ones but I can't remember their names. They were all pretty crappy in dealing with jsp/html/javascript. -Even though I think that JBuilder is the best for writing java.
    If anybody is looking for the best jsp/html/javascript editor you can save yourself a lot of headaches if you try out Visual Slick. And by the way I'm a graduate student, I don't work for Visual Slick.

    Hi,
    Thanks for Together suggestion. It looks pretty loaded, with many different tools. But maybe it's my stupidity: i couldn't add a java file to the project i opened, and there are no menu items/shortcuts to compile a java file. I spent an hour on this, then gave up and returned to my previous development tool. It's not as loaded, and has some keying problems, but at least i am in total control there.
    Any tips?
    Thanks,
    r

  • JSP, BEANS AND DAO best practice... (and a little of STRUTS & JSTL)

    Hi,
    Want to get your opinion on how to really use bean and dao in jsp pages.
    Imagine that you wants to display a news list on the jsp index page for example.
    You've got a dao with method getLastNews(int size) which returns a Collection of News beans. Then with jstl or struts you iterate ove the collection to display the news in a formatted way.
    Easy to build collection with scriptlets & co but not very clean...
    What is the best way to call my dao and its method with a tag whithout using scriplets ?
    Thanks

    Yes this is the solution i use when the collection is displayed alone in a jsp page, but how do you do this when you include this collection in a page, and if you have other collections in other parts of the page ? Is there a clean solution of doing this in the jsp page? For example:
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    I know that i can write my own tag by if there is an existing solution...

  • Best Jsp book with practical approach

    hi
    I am new to JSP.
    I wish to learn JSP with more of practical approach.
    I have already gone through "Head First JSP and servlets"...but it is more dedicated towards SCWCD...
    so this time i wish to take sugessions before picking up a book...
    I need a book with is much more of practical approach...
    covers traps in JSP....
    thanks.

    kmangold wrote:
    Core Servlets & JavaServer Pages is the book I used when I was learning. It helped me get started real easily.I thought Marty Hall's books were OK, but I think Hans Bergsten's JSP book from O'Reilly is the hands down winner. It starts with JSTL right off the bat. You only learn scriptlet coding in a later chapter, almost as a last resort. I think that's the right way to learn JSPs.
    %

  • Jsp Bean

    Hi all,
    I want to create a bean Array such that one set and get propertues can be used for repeated operations.
    That is i am creating Online Exam in that i am selecting Exam Question and options in that one question has 4 options and another question has 5 options i want to display that options in jsp page by using getProperty options in the Bean.How to i do it (at present i created option1 option2,option3,option4 in set and get Properties please helpme to solve this
    Regards
    Beval

    Return all the options from your bean as a Collection. This way you can retrieve the options with one get call, and then use an Iterator in your page to loop through the number of options you havea, without needing to know exactly how many were returned.
    If you are not familar with Collections then check our the Java Tutorial for more info.
    Kevin Hooke
    Kev's Development Toolbox
    http://www.kevinhooke.com

  • Jsp bean property method dilemma

    Hi all,
    I'm just starting using bean and trying to convert old jsp in MVC model using beans. I expose the problem:
    a simple internal search engine ask with a form to enter the some parameter. I want to use this parameter to compose my query to the db.
    Now I use this code in my jsp to make the query:
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    Hashtable hshTable = new Hashtable(10);
    Enumeration enumParam = request.getParameterNames();
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       String sValore = request.getParameter(name);
       if (!sValore.equals(""))
        hshTable.put(name, new String(sValore));
    Enumeration enumHshTable = hshTable.keys();
    while (enumHshTable.hasMoreElements())
      String str_SelectStatement = "SELECT * FROM myTable";
      /*If isn't my first time don't add WHERE but AND*/
      if (firstTime)
       str_SelectStatement += " WHERE (";
       firstTime = false;
      else
       str_SelectStatement +=" AND (";
      String sKey = (String)enumHshTable.nextElement();
       str_SelectStatement += sKey + " LIKE '" + (String)hshTable.get(sKey) + "%')";
    }In this way I compose a smart query like this:
    SELECT * FROM myTable WHERE param1 LIKE 'param1Value' AND param2 LIKE 'param2Value' AND........
    How to convert it in a bean model?
    If I make n setXxxx() getXxxx() I loss in reuse of code.
    If I make personalized setXxxx() for the param1 how can I access to the name of the current method?
    I need this to compose my query. I can retrive the param1Value but not the current name (param1) of the parameter.
    import java.sql.*;
    import java.io.*;
    public class DbBean
    String Param1;
    ResultSet r = null;
    boolean firstTime = true;
    String str_SelectStatement = "SELECT * FROM myTable";
    public DbBean()
      super();
    public String getParam1() throws SQLException
      this.Param1 = r.getString("Param1")!=null?r.getString("Param1"):"";
      return this.Param1;
    public void setParam1(String param1Value)
      if (firstTime)
       str_SelectStatement += " WHERE (";
       firstTime = false;
      else
       str_SelectStatement +=" AND (";
    str_SelectStatement += NameOfTheMethod... + " LIKE '" + param1Value;
      this.Param1= newValue;
    }How can I take the NameOfTheMethod... Param1?
    I search around and I read that you can access to the Method name in the stack trace in an other method. But I can't belive this is THE way. It is no suitable.
    Any suggestion will be greatly appreciated.
    Thank you

    Hiya Ejmade,
    First of all: you're missing the concept of the MVC (Model - View - Controller) model. There are two (2) versions out there, with the currently pending (no. 2) going like this:
    from a resource, a JSP page acquires a java bean, encapsulating the data. Via set/get methods of the bean, you create content on the JSP page
    If you wanted to comprise your search engine like this, you would first have to create a file search.jsp (can be .html at this point) which would call a SearchServlet. This servlet would perform a query, encapsulate the data in some object (let's say java.sql.ResultSet) and then forward control to a JSP page, including the object. The page would acquire the object (through the session context, for instance), extract data, and make it available on the site.
    But that's not what's puzzleing you. You would like to know which method created the database query string so you could adapt that very string. This can be done with the class introspection API, reflection. It's quite complex, you'll need to read about it in a tutorial, try:
    http://java.sun.com/tutorial
    The reflection API has quite a lot of overhead and it, honestly speaking, does not have to be used here. Instead, try this:
    public class DBean {
    Hashtable queryParamters;
    public DBean(Hashtable queryParameters) {
      this.queryParameters = queryParameters;
    public String generateSQLCode() {
      StringBuffer call = new StringBuffer("SELECT * FROM myTable WHERE ");
      for (Enumeration e = queryParameters.keys(); e.hasMoreElements();) {
       String key = (String)e.nextElement();
       call.append(key + " LIKE " + (String)queryParameters.get(key));
      return(call.toString());
    }This code should generate the string for you (with minor adjusments). Btw, I noticed some basic mistakes in the code (calling the Object() constructor, for instance, which is not neccessary). Do pick up a good java book ..
    Hope this helps,
    -ike, .si

  • Calling JSP bean function on button OnClick

    Hi-
    A NewBie question....
    I have a .jsp page and supporting .java bean.
    I registed the bean in .jsp page using <jsp:useBean ...>
    I want to fire a function defined in that bean on the click of a button which is defined in the .jsp page
    So I am doing something like this... seems like not the correct way to do since it fires this script all the time, not just when the button is clicked.
    <input name='click1' type='Submit' value='Click1' onClick='<% testBean.click1Clicked (); %>'/>
    Thanks for your help.

    Hi Kishor-
    Thanks for the reply.
    I realize that might be the case, as u explained in your two points.
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