Importing class or jsp:useBean option

Hi,
I am bit confused as when to use between "beanClasses" or "tag librery" or "simple java classes useing import". as far as i feel all are capable of doing almost each others task (i.e excuting a method to process something). can anyone help me in understanding this

Well, first, if I understand correctly,
"simple java classes useing import"Would be using scriptlets to do the job. It is always best to avoid scriptlets, and the best way to do that is to
use javabeans. So I would say use "beanClasses" over "simple java classes useing import" whenever humanly possible.
On the other hand, I use tags and beans for different reasons. I use beans to transport data from one spot to another, such as through pages and requests, or to access non-display logic, like getting data from a database. I use tags mainly for complex display operations.
For instance, lets use the oft-asked Paging question. I have a database with 500 records. I want to display 20 at a time in a JSP. I would use a Bean to get the information (and store it in a List of another Bean type). Then I would use a tag to do the [prev] 1 2 3 4 5 6 7 8 9 10 ... [next] display and links.
Hi,
I am bit confused as when to use between
"beanClasses" or "tag librery" or . as far as i feel all are
capable of doing almost each others task (i.e
excuting a method to process something). can anyone
help me in understanding this

Similar Messages

  • Importing classes into JSP page

    Hi There,
    I am new to this and here is my problem.
    I am doing a shopping cart tutorial and trying to get a JSP page to import two classes :
    <%@ page language="java" contentType="text/html"
    import="ShoppingBasket,Product"
    errorPage="errorpage.jsp" %>
    I get :
    C:\jakarta-tomcat-4.1.30\work\Standalone\localhost\_\shop_0002dbasket_jsp.java:7: '.' expected
    import ShoppingBasket;
    ^
    C:\jakarta-tomcat-4.1.30\work\Standalone\localhost\_\shop_0002dbasket_jsp.java:8: '.' expected
    import Product;
    ^
    C:\jakarta-tomcat-4.1.30\work\Standalone\localhost\_\shop_0002dbasket_jsp.java:50: cannot resolve symbol
    symbol : class ShoppingBasket
    location: class org.apache.jsp.shop_0002dbasket_jsp
    ShoppingBasket basket = null;
    The classes compile ok . I read that instead of comma seperating the classes it might be better to put them in a package but I do not know the correct syntax or where to put the package if this is correct.
    The tutorial is from this book and the shopping cart source code is here.
    http://www.ineasysteps.com/books/?1840781971
    Any help appreciated
    Jim Ascroft

    A little beginners explanation of classpaths and packages is in order here. A package works like an extension of the name to keep class names unique. For example, if you have a ShoppingBasket.class and you want to use my ShoppingBasket.class along with it the two class names must be unique or different from one another in some way. Yours could be in com.yourcompany package and mine could be in org.mycompany package. When you reference you Shopping backet in your code you would use com.yourcompany.ShoppingBasket and when you reference mine in the same code you would use or.mycompany..ShoppingBasket. Shorthand for the class can be used by adding an import at the top of the referencing java file. An import is like saying "hay compiler, whenever you see ShoppingBasket look for it in the com.mycompany package!" That brings us to the next point. The package name must always be reflected in the directory structure of the .class file location in order to be found. Your shopping basket must be stored under the directory com/yourcompany if it is in package com.yourcompany. That directory structure should extend off of a classpath entry in order to be made available to the JVM. Classpath entries point to folders, jar or zip files that contain packaged and unpackaged classes. So If you have a classpath entry that points to C:\jakarta-tomcat-4.1.30\webapps\ROOT\WEB-INF\classes then all unpackaged classes (classes compiled from a .java file without a package statement) will be pulled directly out of this folder. Also, packaged classes will be pulled out of they're packaging directory structure, which should be located in this folder. You can have as many classpath entries as you want but the classes will be pulled out of the first entry that they can be found under. Now with a web app you don't normally fuss with the setting of classpaths since they are already predefined and configured for you. You just need to know to put all of your class files under the WEB-INF/classes directory in the root of your web app. You do, however, still need to know how they work. You also should know that any jar files should be placed in the lib folder of your web app and not under the classes folder.
    Getting back to your immediate problem, why are you getting class not found errors? Well this stems from what was said above. To fix these kind of problems follow these steps:
    1st off, find out exactly which .java file the .class file was compiled from. (This can be a problem in some environments where multiple copies of source hang around.) This step may involve a recompile and paying close attention to the compiler arguments. In an IDE there should be a setting or dialog that lets you find out exactly where it's placing the .class files created from you source.
    Next, determine what package the .class file should be in by examining (and maybe changing) the package statement at the top. For example, if you intended to put ShoppingBasket in the com.bloodoo package make sure it has a package "com.bloodoo;" statement at the top.
    Next recompile the .java source and move the packaging directory structure into the classes folder of your app. (This would be WEB-INF/classes under the root of the web-app.) For example if ShoppingBasket.class was compiled into the com/bloodoo folder under C:\Program Files\YourIDE\projects\yourproject\output then copy the com folder out of the output folder and into the WEB-INF\classes folder.
    Next examine the calling code (JSP or servlet .java code) and make sure it references the problem class out of the right package. For example, yourpage.jsp should reference the class com.bloodoo.ShoppingBasket and not ShoppingBasket if the shopping basket is deployed in package com/bloodoo. This gets tricky with jsp usebean tags because the desire is to use shorthand but I'm not sure if that works with the use bean tag. Make any modifications and recompile if necessary.
    Lastly, as a rule of thumb avoid wild-card imports (eg. import com.package.*) because they are a common cause of confusion especially when refactoring package names and resolving these kind of issues.Those steps should allow you to resolve 85-90% of your class not found issues. The other 10-15% are rare cases involving the use of custom classloaders, the Java extension mechanism and/or classpath trickery. If you still have questions/problems post back.
    Cliff

  • Can't import class into JSP

    Hi,
    I am trying to import a class into my JSP and am getting the following error at runtime:
    org.apache.jasper.JasperException: Unable to compile class for JSP
    An error occurred at line: -1 in the jsp file: null
    Generated servlet error:
    [javac] Compiling 1 source file
    [javac] D:\jwsdp-1.2\work\Catalina\localhost\pe\org\apache\jsp\guestbook_jsp.java:7: '.' expected
    [javac] import MessageGetter;
    My import statement in the JSP is simply:
    <%@ page import="MessageGetter" %>
    and I am placing the class in the WEB-INF/classes directory. This is stumping me - if you've come across this or a similar problem, please let me know. Thanks.
    P

    Try posting your question in the JSP forum (http://forum.java.sun.com/forum.jsp?forum=45)
    cheers,
    Mike

  • ACK! Importing classes in JSP?!?! HELP!!!

    I am REALLY new to the JSP world and just finished creating a java applet that creates a graph and two combo boxes containing information that I need to display on a web page.
    The problem is that I have just been told to convert it to JSP? Is this possible? If it IS possible, how do you import a public class into JSP?
    Thanks sooooo much for your help!!!!!
    Adam

    Answer is yes you can import a java class
    Here is how it works
    use the following
    <%@ page import="com.temp.YourClass*" %>
    Assuming that you classpath is set properly
    Thanks
    Sampath Thummati.

  • Importing classes in jsp

    In jakarta tomcat servlet engine, in which directory should I put a class file so that i can call it from a jsp located in /examples/jsp or where should I put the class file so that it can be called using <jsp:useBean> tag

    In jakarta tomcat servlet engine, in which directory
    should I put a class file so that i can call it from a
    jsp located in /examples/jsp or where should I put the
    class file so that it can be called using
    <jsp:useBean> tagI don't use Tomcat at the moment, but I think it's the same with resin and other stuff.
    You have a path called "/WEB-INF/classes" somewhere under your tomcat root. This is the location where you should store your classes and packages. The servers using only this path to locate classes, not your classpath.
    I hope, this helps.

  • Importing class to JSP in websphere (newbie)

    Hi I am trying to figure out how to properly import a class in a JSP.
    The DocumentRoot directory is set in Websphere and that is where my JSP's reside. I have created a folder off of the DocumentRoot directory called classes and placed my .class file in there. I then set the classes directory in the classpath (and restarted the appserver)
    I have an import statement in my jsp for the class.
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    <BODY>
    <%
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    out.println("Error detected " + e.getMessage());
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    </BODY>
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    class IPRStat
    public IPRStat(String i, String d )
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    public String getStatus()
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    private String iprnum;
    private String status;
    -----------------------------------------------------

    DocumentRoot (looks something like: /aibm/Userdata/WebAsAdv/default/mydev) is where my JSP's live (i.e.)
    /aibm/Userdata/WebAsAdv/default/mydev/testidea.jsp
    and I made a directory off of DocumentRoot called classes:
    /aibm/Userdata/WebAsAdv/default/mydev/classes
    And copied IPRStat.class into the classes directory.
    /aibm/Userdata/WebAsAdv/default/mydev/classes/IPRStat.class
    I then put the path (/aibm/Userdata/WebAsAdv/default/mydev/classes) in the classpath and restarted the appserver.
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  • Problem importing classes and beans

    Hey there. Im having one major fustrating problem! When I code supporting classes and beans for my JSPs I get a code 500 internal server error when trying to import (via <%@ page import="class" %> and <jsp:useBean/>) Im storing my classes and beans in the WEB-INF folder and the calling JSPs are located in /ROOT/tests/8/jsp.jsp. Im using the following to import a class or bean:
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    Seen as tho its in the WEB-INF folder I won't have to explicitly refer to where the class is located, just the class name.
    I never had this problem when I was using my hosting service. Its only on my localhost server in which I get the Internal Server error.
    Help appreciated, thx.
    PS: Im quite new to JSP/Java Servlet.

    import (via <%@ page import="class" %> and
    <jsp:useBean/>) Im storing my classes and beans in the
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  • Unable to compile class for JSP

    Please can anyone help me to solve this.
    Actually,this is the condition.
    In my db,there is a table called UserPassword, which has 4
    fields(empNo,UserName,password,level). Now I want to do these things:
    When the user submits the data to create a new account via HTML form, it submits the data to the file called CreateAcc.jsp. In this file it perform some logic,here are they.
    1)To check the empNo,if it is already exist in the DB,
         if empNo =exist then display error.(record already exist)
         if empNo =notexist then do task 2).
    2)check the UserName,if it is already exist in the db,
         if UserName=exist then display error.(because it's a primary key)
         if UserName=notexist then do task 3).
    3)Create a new user account and save it to the db.
    To do these tasks,I never create a new objects for the tasks 1) and 2).
    only for task 3)create an object.
    Is it the right way?
    Here is the file CreateAcc.jsp
    <%@ page language="java" %>
    <%@ page import="core.UserAccManager" %>
    <%@ page import="data.UserPassword" %>
    <jsp:useBean id="UserAccManager" class="core.UserAccManager" scope="session"/>
    <jsp:setProperty name="UserAccManager" property="*"/>
    <jsp:useBean id="UserPassword" class="data.UserPassword" scope="session"/>
    <jsp:setProperty name="UserPassword" property="*"/>
    <%
    String nextPage ="MainForm.jsp";
    if(UserPassword.verifyEmpno()){
         if(UserPassword.verifyUsername()){
              if(UserPassword.createAcc()) nextPage ="MsgAcc.jsp";
          }else{
               nextPage="UserNameExist.jsp";
          else{
              nextPage="UserAccError.jsp";
    %>
    <jsp:forward page="<%=nextPage%>"/>The directory structure:
    UserPassword.java- F:/Project/core/data/UserPassword.java
    UserAccManager.java - F:/Project/core/UserAccManager.java
    Now both are compiling.I put the class files into the TOMCAT,as follows.
    UserAccManager.class - webapps/mySystemName/WEB-INF/classes/core/
    UserPassword.class - webapps/mySystemName/WEB-INF/classes/core/data/
    Here is the full code of the file UserAccManager.java.
    package core;               //Is this right?
    import data.UserPassword;     //Is this right?
    import java.io.*;
    import java.sql.*;
    import java.util.*;
    import javax.sql.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    public final class UserAccManager{
       private static final String DRIVER = "com.mysql.jdbc.Driver";
       private static final String URL = "jdbc:mysql://localhost:3306/superfine";
       private static Connection connection;
       private static PreparedStatement pstmt1;
       private static PreparedStatement pstmt2;     
       private static PreparedStatement pstmt3;     
       private UserAccManager(){
       // Initializes the connection and statements
       public static void initConnection() {
          if (connection == null) {
             try {
                String sql;
                // Open the database
                Class.forName(DRIVER).newInstance();
                connection = DriverManager.getConnection(URL);
                // Prepare the statements
               sql = "SELECT * FROM UserPassword where empNo= ?";
               pstmt1 = connection.prepareStatement(sql);
                sql = "SELECT UserName FROM UserPassword where UserName= ?";
                pstmt2 = connection.prepareStatement(sql);
             sql ="INSERT INTO UserPassword VALUES(?,?,?,?)";
             pstmt3 = connection.prepareStatement(sql);
             catch (Exception ex) {
                System.err.println(ex.getMessage());
       // Closes the connection and statements
       // Method to be called by main class when finished with DB
       public  void closeConnection() {
          //same as previous
       public static boolean verifyEmpno(int empno) {
          boolean emp_no_select_ok = false;
          int emp = -1;
          initConnection();
         try {
          pstmt1.setInt(1, empno);
             ResultSet rs1 = pstmt1.executeQuery();
         while(rs1.next()){
              emp=rs1.getInt("empNo");
         if(emp>0)
              emp_no_select_ok = false;
         } else{
              emp_no_select_ok = true;     
            rs1.close();
         pstmt1.close();     
          catch (Exception ex) {
             System.err.println(ex.getMessage());
          return emp_no_select_ok;
       public static boolean verifyUsername(String username) {
          boolean user_name_select_ok = false;
          String user = "xxxx";
          initConnection();
          try {
          pstmt2.setString(1, username);
             ResultSet rs2 = pstmt2.executeQuery();
            while(rs2.next()){
              user=rs2.getString("UserName");
               if(!user.equals("xxxx"))
              user_name_select_ok = false;
            } else{
              user_name_select_ok = true;     
           rs2.close();
          catch (Exception ex) {
             System.err.println(ex.getMessage());
          return user_name_select_ok;
         public static boolean createAcc(int empno, String username, String password, int
    level){
              boolean create_acc_ok = false;
              initConnection();
              try{
                      //create a new object,from the UserPassword table.
                   UserPassword useraccount = new UserPassword();
                   useraccount.setEmpno(empno);
                   useraccount.setUsername(username);
                   useraccount.setPassword(password);
                   useraccount.setLevel(level);
                   //assign value for ???
                   pstmt3.setInt(1, useraccount.getEmpno());
                   pstmt3.setString(2, useraccount.getUsername());
                   pstmt3.setString(3, useraccount.getPassword());
                   pstmt3.setInt(4, useraccount.getLevel());          
                   if(pstmt3.executeUpdate()==1) create_acc_ok=true;
                   pstmt3.close();
                           //con.close();
                catch(SQLException e2){
                           System.err.println(e2.getMessage());
              return create_acc_ok;
    }here is the bean (part of it)
    package data;               //is it right?
    import java.io.*;
    import java.sql.*;
    import java.util.*;
    import javax.sql.*;
    import javax.servlet.*;
    import javax.servlet.http.*;
    public class UserPassword
         private int empno;
         private String username;
         private String password;
         private int level;
         // Constructor
         public UserPassword()
              this.empno = empno;
              this.username = username;
              this.password = password;
              this.level = level;
         // setters and getters are here.
    //     public boolean verifyEmpno() {
    //               return UserAccManager.verifyEmpno(empno);
    //       public boolean verifyUsername(String username) {
    //            return UserAccManager.verifyUsername(username);
         // These 2 methods not compile with or without para's.So I leave that job for the      
         //controll class UserAccManager.java.
    Now my problem is this: When I submit data, there is an error;org.apache.jasper.JasperException: Unable to compile class for JSP
    An error occurred at line: -1 in the jsp file: null
    Generated servlet error:
    [javac] Compiling 1 source file
    C:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:8:
    cannot access core.data.UserPassword
    bad class file: C:\Program Files\Apache Group\Tomcat
    4.1\webapps\HRM\WEB-INF\classes\core\data\UserPassword.class
    class file contains wrong class: data.UserPassword
    Please remove or make sure it appears in the correct subdirectory of the classpath.
    import core.data.UserPassword;
    ^
    1 error
    Are there any mistakes? If so tell me where is it and how to change them.Please help.

    I try it that way, but it don't compile.
    Error:core\data\UserPassword.java:package javax.servlet does not exist
    import javax.servlet.*;
    core\data\UserPassword.java:package javax.servlet.http does not exist
    import javax.servlet.http.*;
    So,I comment them only in the UserPassword.java file,and compile it again.
    Then it compile well.I goto the directory to get the .class files.
    But there is only UserPassword.class inside the data folder. There is not
    UserAccManager.class in the core folder.
    Then I try this way,I put my 2 java files in to a new folder,
    F:\SystemName\com
    When I try it that way, but it don't compile.
    javac -classpath . -d . com\*.javaError:com\UserPassword.java:package javax.servlet does not exist
    import javax.servlet.*;
    com\UserPassword.java:package javax.servlet.http does not exist
    import javax.servlet.http.*;
    So,I comment them only in the UserPassword.java file,and compile it again.
    Now both are compiling well.There was 2 class files.
    I put them in to the WEB-INF/classes/com directory.
    Start the server.But it gave errors:
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:68: cannot resolve symbol
    symbol  : variable empno
    location: class org.apache.jsp.CreateAcc_jsp
    if(UserPassword.verifyEmpno(empno)){
                                ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:69: cannot resolve symbol
    symbol  : variable username
    location: class org.apache.jsp.CreateAcc_jsp
         if(UserAccManager.verifyUsername(username)){
                                             ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:69: non-static method
    verifyUsername(java.lang.String) cannot be referenced from a static context
         if(UserAccManager.verifyUsername(username)){
                             ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
    symbol  : variable empno
    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                                ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
    symbol  : variable username
    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                                       ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
    symbol  : variable password
    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                                                ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
    symbol  : variable level
    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                                                         ^
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: non-static method
    createAcc(int,java.lang.String,java.lang.String,int) cannot be referenced from a static
    context
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                     ^
    8 errorsTo solve the problem non-static method,I goto the UserAccManager.java file and do these
    things.
    package com;
    import java.io.*;
    import java.sql.*;
    import java.util.*;
    import javax.sql.*;
    //import javax.servlet.*;               //otherwise it tells an error.(package           
                                  //javax.servlet does not exist)
    //import javax.servlet.http.*;
    public  class UserAccManager {
       private static final String DRIVER = "com.mysql.jdbc.Driver";
       private static final String URL = "jdbc:mysql://localhost:3306/superfine";
       private static Connection connection;
       private static PreparedStatement pstmt1;
        private static PreparedStatement pstmt2;
          private static PreparedStatement pstmt3;
       private UserAccManager() {
       // Initializes the connection and statements
       private static void initConnection() {
             //same
       // Closes the connection and statements
       // Method to be called by main class when finished with DB
       public static void closeConnection() {
         //same
       public static boolean verifyEmpno(int empno) {
          // same.
       public static boolean verifyUsername(String username) {
         //same.
         public static boolean createAcc(int empno, String username, String password, int      
    level){
              //same
    package com;
    import java.io.*;
    import java.sql.*;
    import java.util.*;
    import javax.sql.*;
    //import javax.servlet.*;
    //import javax.servlet.http.*;
    public class UserPassword {
         // same
    Again compile those files and put .class filses into the WEB-INF/classes/com directory.
    When i submits the data via the form it generates an error:
    org.apache.jasper.JasperException: Unable to compile class for JSP
    An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
    Generated servlet error:
        [javac] Compiling 1 source file
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:68: cannot resolve symbol
    symbol  : variable empno
    location: class org.apache.jsp.CreateAcc_jsp
    if(UserAccManager.verifyEmpno(empno)){
                                  ^
    An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
    Generated servlet error:
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:69: cannot resolve symbol
    symbol  : variable username
    location: class org.apache.jsp.CreateAcc_jsp
         if(UserAccManager.verifyUsername(username)){
                                             ^
    An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
    Generated servlet error:
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
    symbol  : variable empno
    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                                ^
    An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
    Generated servlet error:
    C:\Program Files\Apache Group\Tomcat
    4.1\work\Standalone\localhost\HRM\CreateAcc_jsp.java:70: cannot resolve symbol
    symbol  : variable username
    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
    ="MsgAcc.jsp";
                                                       ^
    An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
    Generated servlet error:
    C:\Program Files\Apache Group\Tomcat
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    location: class org.apache.jsp.CreateAcc_jsp
              if(UserAccManager.createAcc(empno, username,password,level)) nextPage
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    An error occurred at line: 9 in the jsp file: /CreateAcc.jsp
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    public void setEmail( String value )
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    message
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    exception
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    org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:437)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:497)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:476)
    org.apache.jasper.compiler.Compiler.compile(Compiler.java:464)
    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)
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    Apache Tomcat/5.0.30
    please Reply me ASAP
    i'll be glad if you reply. please

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    <HTML>
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    </BODY>
    </HTML>
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    public String getEmail() { return email; }
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