Java bean field naming convention
I posted this under the Desktop -> JavaBeans, but wasn't sure if that was the right place, so I'm posting here to:
I have an object with a field "iATANumber".
I have getters and setters like this:
public String getIATANumber() {
return iATANumber;
public void setIATANumber(String iATANumber) {
this.iATANumber = iATANumber;
}In my jsp I'm trying to print it out like this:
${foo.iATANumber}and it doesn't work. I just get nothing, while all the other fields on my object work, and it prints out the number I want if I call the getter from a scriptlet.
Everything works great though if I change the field to iataNumber (note the change in case), and change the getter, setters and jstl to match. Then the jsp works fine.
The getter and setter names for iATANumber were generated useing IntelliJ, are they not right, and that's why ${foo.iATANumber} won't work?
Thanks in advance.
The JavaBeans naming convention falls on its face if a property starts with a lower-case letter followed by an upper-case letter. The commonest way to find this problem is to call your property "eMailAddress" but you have found a different way.
You also found a solution. Workarounds are the best you can do here.
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What's the naming convention for helper class?
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Thanks in advance!Hi.,
Normally in JAVA the naming convention for Helper Class is <EventID>Util.java. The Naming convention for helper class must start with EventID.
here Event ID is the event Name , Util.java is the helper class for java.
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Kiran -
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Hello,
I'd like to show a component whenever there is an error message in the Faces context. Naively, I set the component's "rendered" attribute to the following:
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The object returned by facesContext.messages is an iterator, the properties of which do not follow Java Bean naming conventions. If there was a method called getHasNext() then all would be well. However as it stands, EL cannot evaluate this expression.
I realise that wrapping this up in a managed bean would solve the problem, but I'd like to avoid this if I am able to do this directly from EL.
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hasNext actually returns a boolean which EL understands fine. In the end I just wrapped the call within a managed bean, as you suggested, and this works a treat:
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Hi all,
I urgently needed your assistance on advice regarding the java naming convention.
i am in the middle of creating a interface class and a implementation class
BusinessAccountIF
and
BusinessAccount
However, I been told is very bad ideal to use the word IF in the ending of interface.
Technical we don’t need to, but I always like my code to be tidy,
hence using the IF in the end of the interfaces class.
Please do let me know what your thought??
Edited by: 846020 on 21-Mar-2011 06:10846020 wrote:
However, I been told is very bad ideal to use the word IF in the ending of interface. I agree. Smacks to me of those annoying chaps that put 'Int' at the end of all integer variables; it's just noise.
Technical we don’t need to, but I always like my code to be tidy, ...
Please do let me know what your thought??As others have said: keep your names as descriptive as possible.
I would expect an interface called 'BusinessAccount' (which seems perfectly sensible to me) to be extended from an interface called 'Account', and have implementing classes that describe a specific type of business account (eg, 'DepositAccount', 'EquityAccount', 'AssetMaintenanceAccount'), possibly via a "skeleton implementation" class, which by convention, is usually called 'AbstractBusinessAccount'.
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HTTP Status 500 -
type Exception report
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Request parameter are not stored in database through Java Bean
Hi,
I want to store the request parameter in database through Java Bean.Allthough program are properly run but value are not store in DB.
Here My code:
Login.html:<html>
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<title>A simple JSP application</title>
<head>
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<form method="get" action="submit.jsp" >
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<input type="Submit" value="Submit">
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import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.util.*;
public class SimpleBean implements java.io.Serializable{
private String User="";
private String Pass="";
public SimpleBean(){}
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this.User = User;
public String getPass() {
return Pass;
public void setPass(String Pass) {
this.Pass = Pass;
public void show()
try
System.out.println("Printed*************************************************************");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
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Connection con=DriverManager.getConnection("jdbc:odbc:Ex11dump");
System.out.println("Connected....");
PreparedStatement st=con.prepareStatement("insert into Table1 values(?,?)");
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String User=getUser();
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st.setString(2,Pass);
int y= st.executeUpdate();
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<%
out.println("Ur data is saved in DB");
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Thanks.The issue is in the naming of your fields.
Change User -> user and Pass->pass
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Using Java Bean in JSP to show database record
I have links in my Tomcat container that if someone clicks on a specific link it should go to a Record page (Show.jsp) with all the values associated with a record from a database.
For example if someone clicks on a specific link like this:
LinkExample
it would take you to a jsp with database info for someone named Jones and show you his info:
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Firstname = Mike
City = San Diego
I would like to do this using a Java helper class and bean so I dont have any database connection or Java code in my JSP.
I created Java class file that has Database connection that works with a Java bean. I just dont know how to get the Show.jsp to work with the Java Bean and Java helper class file.
Here is what I have for Show.jsp and this is the part I have been working on the longest but cant get it to work because it doesnt seem to work with the database:<jsp:useBean id="user" class="num.UserDB"/>
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<jsp:setProperty name="user" property="*"/>
Last Name: <jsp:getProperty name="user" property="lastname"/><BR>
First Name: <jsp:getProperty name="user" property="firstname"/><BR>
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package num;
import java.io.*;
import java.sql.*;
import java.util.*;
import num.User;
public class UserDB
public User getUser(String lastname)
User user = new User();
try
Class.forName...//database connection stuff here
ResultSet results = stmt.executeQuery("SELECT * from user where lastname = '" + lastname + "'");
if(results.next() == true)
results.next();
user.setLastname(results.getString("lastname"));
user.setFirstname(results.getString("firstname"));
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catch(Exception e)
System.out.println("Exception...");
return user;
}My Java Bean that compiles here:
package num;
public class User
private String firstname;
private String lastname;
private String city;
public User()
//no arg constructor
public User(String firstname, String lastname, String city)
this.lastname = lastname;
this.firstname = firstname;
this.city = city;
public String getLastname()
return lastname;
public void setLastname(String lastname)
this.lastname = lastname;
//more bean methods for all fields here
Sorry if I wasnt specific enough. I have a link that passes a value (field that is passed is called lastname) to a JSP where I want to show record info for that value that is passed.
My question is how do I show the database record info on Show.jsp for the lastname field value of Jones where I want to use a Java Bean and Database helper class in Show.jsp
Here is the message I get when I hit the link (LinkExample) and it goes to Show.jsp:
org.apache.jasper.JasperException: Cannot find any information on property 'lastname' in a bean of type 'num.UserDB'
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public class UserDB
public User getUser(String lastname)
User user = new User();
try
Class.forName("org.gjt.mm.mysql.Driver");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/dbconnone?user=smitherson&password=abcdefg");
Statement stmt = conn.createStatement();
ResultSet results = stmt.executeQuery("SELECT * from user where lastname = '" + lastname + "'");
if(results.next() == true)
results.next();
user.setLastname(results.getString("lastname"));
user.setFirstname(results.getString("firstname"));
user.city(results.getString("city"));
catch(Exception e)
System.out.println("Exception..." + e);
return user;
}Bean class:
package num;
public class User
private String firstname;
private String lastname;
private String city;
public User()
//no arg constructor
public User(String firstname, String lastname, Sting city)
this.firstname = firstname;
this.lastname = lastname;
this.city = city;
public String getFirstname()
return firstname;
public void setFirstname(String firstname)
this.firstname = firstname;
public String getLastname()
return lastname;
public void setLastname(String lastname)
this.lastname = lastname;
public String getCity()
return city;
public void setCity(String city)
this.city = city;
-
many a times i face difficulty with the Action/Class naming convention.
Say, today ..i wrote a class.....tomorrow i have to rename the name of the class so that it becomes a more meaningful name and becomes unique and understandable with the newcomer classes.
...just to do this, i had to change the name of the class very frequently.
Though i follow few conventions like :
1) First letter of the class is Captial letter.
2) use names which is relevant with the classs's functionality.
but still i fall in problem....
say, i want to populate a DataBase with my class.....whats the name i should keep ? tommorrow i am going to write another class which also populate the database . what do i do ?
i first rename the old class with some meaningful name and then i write the new class with some other meaningful name.....but this kills time.....demands lots of changes....and so on...
you know, i get trouble when my number of classes increases.
do u feel the same ?
what are the rules (NOT JAVA RULES but meaningful rules) i should remember to keep a class name ?You can name a class based on what it supposed to
do...
while naming it follow conventions like the ones
which are mentioned in the code
conventions/guidelines of your project.
You will not be writing the same functionality in two
different classes... would you??
In case you may need to refractor(rename the class
name) you may use java editor with refractoring
capability to do it..
With most of the java editors, you get this
functionality.. e.g. doing a Alt+Shift+R would
refractor your selected method, class, field etc...
This applies to Eclipse
>
Hope that helps..
Vaibhav -
Question about main difference between Java bean and Java class in JSP
Hi All,
I am new to Java Bean and wonder what is the main difference to use a Bean or an Object in the jsp. I have search on the forum and find some post also asking the question but still answer my doubt. Indeed, what is the real advantage of using bean in jsp.
Let me give an example to illustrate my question:
<code>
<%@ page errorPage="errorpage.jsp" %>
<%@ page import="ShoppingCart" %>
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<jsp:useBean id="cart" scope="session" class="ShoppingCart" />
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<body bgcolor="#FFFFFF">
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</code>
In the above code, I can also create a object of ShoppingCart by new operator then get the id at the following way.
<code>
<%
ShoppingCart cart = new ShoppingCart();
out.println(cart.getId());
%>
</code>
Now my question is what is the difference between the two method? As in my mind, a normal class can also have it setter and getter methods for its properties. But someone may say that, there is a scope="session", which can be declared in an normal object. It may be a point but it can be easily solved but putting the object in session by "session.setAttribute("cart", cart)".
I have been searching on this issue on the internet for a long time and most of them just say someting like "persistance of state", "bean follow some conventions of naming", "bean must implement ser" and so on. All of above can be solved by other means, for example, a normal class can also follow the convention. I am really get confused with it, and really want to know what is the main point(s) of using the java bean.
Any help will be highly apprecaited. Thanks!!!
Best Regards,
AlexHi All,
I am new to Java Bean and wonder what is the main
difference to use a Bean or an Object in the jsp. The first thing to realize is that JavaBeans are just Plain Old Java Objects (POJOs) that follow a specific set of semantics (get/set methods, etc...). So what is the difference between a Bean and an Object? Nothing.
<jsp:useBean id="cart" scope="session" class="ShoppingCart" />
In the above code, I can also create a object of
ShoppingCart by new operator then get the id at the
following way.
ShoppingCart cart = new ShoppingCart();
out.println(cart.getId());
...Sure you could. And if the Cart was in a package (it has to be) you also need to put an import statement in. Oh, and to make sure the object is accessable in the same scope, you have to put it into the PageContext scope. And to totally equal, you first check to see if that object already exists in scope. So to get the equivalant of this:
<jsp:useBean id="cart" class="my.pack.ShoppingCart"/>Then your scriptlet looks like this:
<%@ page import="my.pack.ShoppingCart %>
<%
ShoppingCart cart = pageContext.getAttribute("cart");
if (cart == null) {
cart = new ShoppingCart();
pageContext.setAttribute("cart", cart);
%>So it is a lot more work.
As in my mind, a normal class can also
have it setter and getter methods for its properties.True ... See below.
But someone may say that, there is a scope="session",
which can be declared in an normal object.As long as the object is serializeable, yes.
It may be
a point but it can be easily solved but putting the
object in session by "session.setAttribute("cart",
cart)".Possible, but if the object isn't serializable it can be unsafe. As the point I mentioned above, the useBean tag allows you to check if the bean exists already, and use that, or make a new one if it does not yet exist in one line. A lot easier than the code you need to use otherwise.
I have been searching on this issue on the internet
for a long time and most of them just say someting
like "persistance of state", "bean follow some
conventions of naming", "bean must implement ser" and
so on. Right, that would go along the lines of the definition of what a JavaBean is.
All of above can be solved by other means, for
example, a normal class can also follow the
convention. And if it does - then it is a JavaBean! A JavaBean is any Object whose class definition would include all of the following:
1) A public, no-argument constructor
2) Implements Serializeable
3) Properties are revealed through public mutator methods (void return type, start with 'set' have a single Object parameter list) and public accessor methods (Object return type, void parameter list, begin with 'get').
4) Contain any necessary event handling methods. Depending on the purpose of the bean, you may include event handlers for when the properties change.
I am really get confused with it, and
really want to know what is the main point(s) of
using the java bean.JavaBeans are normal objects that follow these conventions. Because they do, then you can access them through simplified means. For example, One way of having an object in session that contains data I want to print our might be:
<%@ page import="my.pack.ShoppingCart %>
<%
ShoppingCart cart = session.getAttribute("cart");
if (cart == null) {
cart = new ShoppingCart();
session.setAttribute("cart", cart);
%>Then later where I want to print a total:
<% out.print(cart.getTotal() %>Or, if the cart is a JavaBean I could do this:
<jsp:useBean id="cart" class="my.pack.ShoppingCart" scope="session"/>
Then later on:
<jsp:getProperty name="cart" property="total"/>
Or perhaps I want to set some properties on the object that I get off of the URL's parameter group. I could do this:
<%
ShoppingCart cart = session.getAttribute("cart");
if (cart == null) {
cart = new ShoppingCart();
cart.setCreditCard(request.getParameter("creditCard"));
cart.setFirstName(request.getParameter("firstName"));
cart.setLastName(request.getParameter("lastName"));
cart.setBillingAddress1(request.getParameter("billingAddress1"));
cart.setBillingAddress2(request.getParameter("billingAddress2"));
cart.setZipCode(request.getParameter("zipCode"));
cart.setRegion(request.getParameter("region"));
cart.setCountry(request.getParameter("country"));
pageContext.setAttribute("cart", cart);
session.setAttribute("cart", cart);
}Or you could use:
<jsp:useBean id="cart" class="my.pack.ShoppingCart" scope="session">
<jsp:setProperty name="cart" property="*"/>
</jsp:useBean>The second seems easier to me.
It also allows you to use your objects in more varied cases - for example, JSTL (the standard tag libraries) and EL (expression language) only work with JavaBeans (objects that follow the JavaBeans conventions) because they expect objects to have the no-arg constuctor, and properties accessed/changed via getXXX and setXXX methods.
>
Any help will be highly apprecaited. Thanks!!!
Best Regards,
Alex -
Crystal report Java Beans Connectivity
Hi
My name is Bach Ong. I.m currently migrating Crystal reports 10 to Crystal reports 2008 using Java Beans Connectivity. Using ResultSet as dataset. all results are return alright, EXCEPT for string type fields. The data for STRING type fields are some how suppressed. But if i executed the beans within eclipse the the string field is populated with data.
can someone assist me with this issue.
Thanks
Bach OngSome suggestions I would give for this are:
1. It may be a fault with the data itself. Specifically, if you have a string field that contains invalid or null data (Instead of an empty string), it may be causing an error to be thrown when the report engine tries to process the string fields - and it thus fails on all string fields.
So please try this with some data where all fields contain valid non-null, non-empty data and see if it works.
2. One of the difficulties with javabeans is that they don't give proper error messages. However, there is a way to kick off the javabean java process in the crystal report designer which allows you to debug your javabean inside the report designer. I have attached a sample that shows how to do that - and that should get you the real error message of what is going wrong.
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Shawn
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How do I get macbook air to boot up off of the network
how do i get macbook air to boot up off of the network
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Re: SQL Developer Problems and Feature Requests
"no ocijdbc10 in java.library.path"... What should i do with it? I get it on the simplest of operations: changing (in fact setting) the connection password for the existing connection (defined by TNS/Connect Identifier). Oh, yes, there're workarounds
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Payables data stuck in gl_interface table
Created Invoices in Payables. Validated process run for create accounting & trasfer to gl resulted in warning with message in log: SHRD0008: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Warning ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ R_CLPR0003: Unprocessed records exist i
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Can I delete backup data from my old iPhone which I used to restore my new iphone 5?
My iphone 4S was stolen, and I had to get a new phone. I had all my data backed up on icloud and it was easy to set up my new iphone 5 and getting all my data back, however, I still have my old'd phone backup data on my icloud and it's been taking up