JavaBeans limitations?
hi friends,
I just wanna know what are the limitations of using JavaBeans in a jsp page.
Like for example is is suggestable to use a bean for database connections.
Can anyone give me in detail where to use and where not to use a Bean.
Like if im using many beans doesn't it over burden my server as the beans gets loaded into the server.
thanX in adv,
kiran
I wonder there are no discussions on JavaBeans.
I wan't to know the advantages and disadvantages of using JavaBeans in a JSP page.
Like for example general traditional approach for a database connection
is to create a connection and access the database from that and close the connection
at the end of the page, instead of the If I use a common connection bean for making connections,
is that suggestable and then when should i close the connection then.
One good application of JavaBeans is using a Set and Get methods for form fields in
a registration form to get back the values.
So may i know how best can we use the JavaBeans other than this application.
ThanX in advance,
kiran
[email protected]
Similar Messages
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Strange behaviour of clientinfo Javabean
I have two forms to test some of forms9i features. One of the test is the clientinfo Javabean. One on form (using several features of 9i Demos: for example hyperlink bean, modcursor etc.) doesn't work: when i get certain
properties, using FBean.Invoke_Char a receive a null value.
I created another form with exactly the same commands for registering and getting info from the Java Bean, and in this form it works ...! So my question is: is there some kind of limitation about the use of bean areas in a form module, or am i missing something?. You´ll see that except for some physical attributes, the bean areas have the same properties. Also the code for registering both java beans and from pulling info is the same.I guess you must be right. There must be some problem when then bean area gets instantiated. I have followed your advice: Move bean area to another block, set single record to yes, check ut visible and dimension properties, yet it doesn't work. By the way, this form uses stack canvas. Any ideas.?.
when-new-form-instance :
DECLARE
hHyperlink ITEM:=FIND_ITEM('CONTROL.HYPERLINK');
vclientinfo ITEM:=FIND_ITEM('CONTROL1.INFO');
BEGIN
FBean.Register_Bean(hHyperlink,1,'oracle.forms.demos.beans.Hyperlink');
FBean.Invoke(hHyperlink,1,'setURL','http://www.alfa-asesores.com/');
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go_block('control1');
FBean.Register_Bean(vclientinfo,1,'oracle.forms.demos.beans.GetClientInfo');
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when-button-pressed :
:texto := 'getIPAddress= '||FBean.Invoke_Char('CONTROL1.INFO',1,'getIPAddress')||' getHostname = '||FBean.Invoke_Char('CONTROL1.INFO',1,'getHostname')||' getUsername= '||FBean.Invoke_Char('CONTROL1.INFO',1,'getUsername');
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Is it possible to pass a javabean as an href parameter
Hi
I have a JSP where I receive a javabean in the request scope.
Is it possible to create a html link passing the object as a parameter to another jsp
Pls advise
TIANo you cannot pass an object in this way, href and form submits are html, they execute on the browser, your objects only exist as objects on the server.
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Why not change the bean to session scope, then you can call it directly in the next page? -
JavaBeans code generation from XSD
Hi everyone,
I know that this is not a new question, but I still did not find a satisfying answer.
Does anyone know a good code generator for creating JavaBeans out of XSD schemas?
The output of this tool has to comply with the JavaBeans specification, because we want to map these POJOs to a database with the Java Persistence API. Especially lists and sets need to be created correctly, because we will make heavy use of associations.
I've evaluated a large number of tools, most of them are not useable together with JPA. Here is a short list of tools I already tried:
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I spent quite a lot of time for searching a good code generation framework that works together with JPA. Has anyone made good experience with any kind of code generators in this area?
Thanks for any help!
MartinHi dvohra09,
thanks for your reply. I think JAXB has the same limitations than XMLBeans. As I read at http://java.sun.com/javaee/5/docs/tutorial/doc/JAXB6.html, object instances shall be only accessed via a factory:
"You should never directly use the generated implementation classes--that is, *Impl.java in the <packagename>/impl directory. These classes are not directly referenceable because the class names in this directory are not standardized by the JAXB specification. The ObjectFactory method is the only portable means to create an instance of a schema-derived interface. There is also an ObjectFactory.newInstance(Class JAXBinterface) method that enables you to create instances of interfaces. "
Did you use JAXB2 together with the Java Persistence API? If yes, can you give me please an example how to map generated classes to the database?
Thanks for your help!
Martin -
Interaction between Writer and JavaBeans with Oracle Forms
Hi, guys,
I've been facing some difficulties trying to integrate Writer and Oracle Forms Web (10g). I'm able to open a Writer Document by using a JavaBean executed from Eclipse, but I cannot get the same operation working from forms web. Has anyone ever tried to do somenting like that? Is there a solution to communication between Forms 10G and OpenOffice Writer and how to do it?
Thanks in advance.Hi, François!
Thanks for your prompt answer. But I still have some questions. The Bean I'm using is the OOoBean, provided by OpenOffice and there isn't much documentation around. I have to control the Writer text editor from forms 10G, but I haven't been successful in my goal.
I'll show the code I'm using in eclipse. I need to adapt it to work in Forms 10G.
$RCSfile: OOoBeanViewer.java,v $
* $Revision: 1.3 $
* last change: $Author: vg $ $Date: 2005/02/16 16:22:52 $
* The Contents of this file are made available subject to the terms of
* the BSD license.
* Copyright (c) 2003 by Sun Microsystems, Inc.
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import javax.swing.filechooser.*;
import javax.swing.*;
import com.sun.star.comp.beans.*;
import java.io.*;
/** A simple Applet that contains the SimpleBean.
* This applet is a sample implementation of the
* OpenOffice.org bean.
* When initally loaded the applet has two buttons
* one for opening an existant file and one to open
* a blank document of a given type supported by
* OpenOffice.org eg. Writer, Calc, Impress, .....
public class OOoBeanViewer extends java.applet.Applet
* Private variables declaration - GUI components
private java.awt.Panel rightPanel;
private java.awt.Panel bottomPanel;
private javax.swing.JButton closeButton;
private javax.swing.JButton terminateButton;
private javax.swing.JButton newDocumentButton;
private javax.swing.JPopupMenu documentTypePopUp;
private javax.swing.JCheckBox menuBarButton;
private javax.swing.JCheckBox mainBarButton;
private javax.swing.JCheckBox toolBarButton;
private javax.swing.JCheckBox statusBarButton;
private javax.swing.JButton storeDocumentButton;
private javax.swing.JButton loadDocumentButton;
private javax.swing.JButton syswinButton;
private JTextField documentURLTextField;
private JMenuItem item;
private JFileChooser fileChooser;
private byte buffer[];
* Private variables declaration - SimpleBean variables
private OOoBean aBean;
* Initialize the Appplet
public void init()
//The aBean needs to be initialized to add it to the applet
aBean = new OOoBean();
//Initialize GUI components
rightPanel = new java.awt.Panel();
bottomPanel = new java.awt.Panel();
closeButton = new javax.swing.JButton("close");
terminateButton = new javax.swing.JButton("terminate");
newDocumentButton = new javax.swing.JButton("new document...");
documentTypePopUp = new javax.swing.JPopupMenu();
storeDocumentButton = new javax.swing.JButton("store to buffer");
loadDocumentButton = new javax.swing.JButton("load from buffer");
syswinButton = new javax.swing.JButton("release/aquire");
menuBarButton = new javax.swing.JCheckBox("MenuBar");
menuBarButton.setSelected( aBean.isMenuBarVisible() );
mainBarButton = new javax.swing.JCheckBox("MainBar");
mainBarButton.setSelected( aBean.isStandardBarVisible() );
toolBarButton = new javax.swing.JCheckBox("ToolBar");
toolBarButton.setSelected( aBean.isToolBarVisible() );
statusBarButton = new javax.swing.JCheckBox("StatusBar");
statusBarButton.setSelected( aBean.isStatusBarVisible() );
documentURLTextField = new javax.swing.JTextField();
//Set up the Popup Menu to create a blank document
documentTypePopUp.setToolTipText("Create an empty document");
item = documentTypePopUp.add("Text Document");
item.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
createBlankDoc("private:factory/swriter",
"New text document");
item = documentTypePopUp.add("Presentation Document");
item.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
createBlankDoc("private:factory/simpress",
"New presentation document");
item = documentTypePopUp.add("Drawing Document");
item.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
createBlankDoc("private:factory/sdraw",
"New drawing document");
item = documentTypePopUp.add("Formula Document");
item.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
createBlankDoc("private:factory/smath",
"New formula document");
item = documentTypePopUp.add("Spreadsheet Document");
item.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
createBlankDoc("private:factory/scalc",
"New spreadsheet document");
syswinButton.addActionListener(
new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
try
aBean.releaseSystemWindow();
aBean.aquireSystemWindow();
catch ( com.sun.star.comp.beans.NoConnectionException aExc )
catch ( com.sun.star.comp.beans.SystemWindowException aExc )
storeDocumentButton.addActionListener(
new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
try
buffer = aBean.storeToByteArray( null, null );
catch ( Throwable aExc )
System.err.println( "storeToBuffer failed: " + aExc );
aExc.printStackTrace( System.err );
loadDocumentButton.addActionListener(
new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
try
aBean.loadFromByteArray( buffer, null );
catch ( Throwable aExc )
System.err.println( "loadFromBuffer failed: " + aExc );
aExc.printStackTrace( System.err );
closeButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
close();
terminateButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
terminate();
newDocumentButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
documentTypePopUp.show((java.awt.Component)evt.getSource(), 0,0);
menuBarButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
aBean.setMenuBarVisible( !aBean.isMenuBarVisible() );
mainBarButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
aBean.setStandardBarVisible( !aBean.isStandardBarVisible() );
toolBarButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
aBean.setToolBarVisible( !aBean.isToolBarVisible() );
statusBarButton.addActionListener(new java.awt.event.ActionListener()
public void actionPerformed(java.awt.event.ActionEvent evt)
aBean.setStatusBarVisible( !aBean.isStatusBarVisible() );
documentURLTextField.setEditable(false);
documentURLTextField.setPreferredSize(new java.awt.Dimension(200, 30));
rightPanel.setLayout( new java.awt.GridLayout(10,1) );
rightPanel.add(closeButton);
rightPanel.add(terminateButton);
rightPanel.add(newDocumentButton);
rightPanel.add(storeDocumentButton);
rightPanel.add(loadDocumentButton);
rightPanel.add(syswinButton);
rightPanel.add(menuBarButton);
rightPanel.add(mainBarButton);
rightPanel.add(toolBarButton);
rightPanel.add(statusBarButton);
//bottomPanel.setLayout( new java.awt.GridLayout(1,1) );
bottomPanel.setLayout( new java.awt.BorderLayout() );
bottomPanel.add(documentURLTextField);
setLayout(new java.awt.BorderLayout());
add(aBean, java.awt.BorderLayout.CENTER);
add(rightPanel, java.awt.BorderLayout.EAST);
add(bottomPanel, java.awt.BorderLayout.SOUTH);
* Create a blank document of type <code>desc</code>
* @param url The private internal URL of the OpenOffice.org
* document describing the document
* @param desc A description of the document to be created
private void createBlankDoc(String url, String desc)
//Create a blank document
try
documentURLTextField.setText(desc);
//Get the office process to load the URL
aBean.loadFromURL( url, null );
aBean.aquireSystemWindow();
catch ( com.sun.star.comp.beans.SystemWindowException aExc )
System.err.println( "OOoBeanViewer.1:" );
aExc.printStackTrace();
catch ( com.sun.star.comp.beans.NoConnectionException aExc )
System.err.println( "OOoBeanViewer.2:" );
aExc.printStackTrace();
catch ( Exception aExc )
System.err.println( "OOoBeanViewer.3:" );
aExc.printStackTrace();
//return;
/** closes the bean viewer, leaves OOo running.
private void close()
setVisible(false);
aBean.stopOOoConnection();
stop();
System.exit(0);
/** closes the bean viewer and tries to terminate OOo.
private void terminate()
setVisible(false);
com.sun.star.frame.XDesktop xDesktop = null;
try {
xDesktop = aBean.getOOoDesktop();
catch ( com.sun.star.comp.beans.NoConnectionException aExc ) {} // ignore
aBean.stopOOoConnection();
stop();
if ( xDesktop != null )
xDesktop.terminate();
System.exit(0);
* An ExitListener listening for windowClosing events
class ExitListener extends java.awt.event.WindowAdapter
* windowClosed
* @param e A WindowEvent for a closed Window event
public void windowClosed( java.awt.event.WindowEvent e)
close();
* windowClosing for a closing window event
* @param e A WindowEvent for a closing window event
public void windowClosing( java.awt.event.WindowEvent e)
((java.awt.Window)e.getSource()).dispose();
public static void main(String args[])
java.awt.Frame frame = new java.awt.Frame("OpenOffice.org Demo");
OOoBeanViewer aViewer = new OOoBeanViewer();
frame.setLayout(new java.awt.BorderLayout());
frame.addWindowListener( aViewer.new ExitListener() );
aViewer.init();
aViewer.start();
frame.add(aViewer);
frame.setLocation( 200, 200 );
frame.setSize( 800, 480 );
frame.show();
} -
Hello Everybody,
In my Web Dynpro project I have imported a JavaBean model (including relations and
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relations belonging to the new model. I tried importing the new JavaBean model with the
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model class are not available in the new model - so how do I define the relations?
Thanks for the feedback.A.H.,
This is a limitation of WebDynpro JavaBean model wizard -- you may not use same JavaBean more then in one model.
The only possible but unsupported workaround is to create your *.wdmodel file manually using text/xml editor, then reload project and get new model. It's better to start with new model without same beans, then copy necessary lines from "old" model.
Valery Silaev
SaM Solutions
http://www.sam-solutions.net -
Difficulty abstracting EJB - JavaBean mapping
We are implementing a java based MVC architecture. The Model portion is really two seperate tiers, one being JavaBeans with which the View communicates and the second being EJBs as a buffer to the data store. In between these two is a very thin layer whose sole responsibility it is to map the data between the JavaBean and the EJB based on a C-like-struct structure utilized by both. For example, in a "get" request, this mapper layer instantiates the appropriate JavaBean, looks up the appropriate EJBHome, gets the remote of the specified primary key, gets the "struct" from the EJB and loads it into the JavaBean. However, I have run into all kinds of problems with doing this because of the J2EE/EJB restriction prohibiting the home from returning super-types of the remote.
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Thanks.Moving back towards top...
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I have the following Lenovo notebook :
Product: ThinkPad T61 8898-55G [change]
Operating system: All [change]
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I configured my Notebook with a Dual-boot Windowx XP Pro SP3 and Windows Vista Bussines SP1 (32 bit)
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I read on the Lenovo site :
Memory Compatibility
(**) Windows Vista supports up to 4GB maximum memory (32-bit versions of Windows Vista cannot support 4GB). Windows XP supports up to 3GB maximum memory
I like to update my memory with
2x 40Y7734 1 GB PC2-5300 667 MHz DDR2
or
2x 40Y7735 2 GB PC2-5300 667 MHz DDR2
I like to know if I choose for 2x 2GB , will :
Windows XP SP3 work just fine only it works with 3GB instead of 4GB installed memory
Window Vista SP1 (32-bit) with the 4GB (even not supported) work stable ?
Because the prices of 1 GB and 2 GB won't change much nowadays.
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Electronic
Message Edited by electronic on 01-16-2009 09:51 PMYou're better off with 2x2GB, you may decide to run a 64-bit OS someday...and you will notice a difference between 2GB and 3GB when running a 32-bit OS.
Cheers,
George
In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you. -
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Hi All,
Is there a std report in SAP that the users can use to view Qty and Val Contracts that has exceed in Qty (in case of Qty Contracts) or Val (in case of Val Contracts) ?
Thanks in advance!hi Duke,
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Hope it helps...
Regards
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No acutally what that means is most people like myself have to install 30 apps just to get the iphone to do half the things it should have done out of the box. Sure some are wants but most are "need" in order for it to do the things my old palm treo 600 could do, and still there's not copy and past and no video. On top of that they have a stupid 130 limit. I'd love to hear why that is.
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The code and attached subVI’s is attached. Hopefully it's all there.
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Attachments:
Test Program.zip 295 KBLynn,
Yea, I'll have to keep on the block diagram size in the future. Can get unwieldy.
I tried incorporating the Recent History Buffer example into my code. I did have a few hang ups, which are giving me some trouble. Mostly, how do I connect my waveform data to the Buffer VI? Will I be able to have all my channels connect to this? Also, ultimately I will have two write to file VI's. Can the buffer differentiate between which file to write?
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Alex
Attachments:
Instrument Panel V1.1 (Labview 8.0).vi 159 KB -
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Maintain tolerance limits in the Tolerance key
Hi,
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Best Regards,
Sridhar.kWhat is the Error Mesaage no you are getting??
Solution is as Follows
Set Tolerance Limits for Price Variance
In this step, you define the tolerance limits for price variances.
When processing a purchase order, the system checks whether the effective price of a PO item shows variances compared with the valuation price stored in the material master record. In addition, it checks whether the specified cash discount value is admissible.
Variances are allowed within the framework of tolerance limits. If a variance exceeds a tolerance limit, the system issues a warning or error message.
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Standard settings
The standard SAP System supplied contains the following tolerance keys:
PE Price variance, Purchasing
Tolerance limit for system message no. 207. This message appears if the specified effective price exceeds the predefined tolerances when compared with the material price.
SE Maximum cash discount deduction, Purchasing
Tolerance limit for system message no. 231. This is a warning message, which appears when the specified cash discount percentage exceeds the predefined tolerances.
Note
You can specify whether the system message appears as a warning or error message using the menu options <b>Environment -> Define Attributes of System Messages.</b>
Activities
Maintain the tolerance limits for each tolerance key per company code
Regards
Biswajit -
I have a new Windows tablet computer with limited hard drive space (32 GB), and cannot transfer my itunes library to the hard drive. Can I run itunes from an external hard drive? I have tried to follow some of the directions on this site, but am having no success. Thanks.
iTunes will run fine with the media on an external drive.
However, I suggest that a tablet computer with a tiny hard drive is not ideal as the primary computer for managing an iTunes library, even a small one. If you have another machine, perhaps a big, boxy, inexpensive old desktop with a decent amount of storage, that might be a better choice.
http://support.apple.com/kb/HT1364
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