Beans and classes
Is it possible to use bean not just as storage but as a class- to use methods other then get or set on it? I added a little method that just prints out all of the parameters but what I get is
javax.servlet.ServletException: foo.Creature.stats()Ljava/lang/String;
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)
at org.apache.jsp.index1_jsp._jspService(index1_jsp.java:77)
(jsp page is index1.jsp)
and in that index1_jsp.java file line 77 looks like
if (pageContext != null) pageContext.handlePageException(t);
which doesnt tell me a whole lot. So how do I use methods on beans and how do I make errors make more sence?
Sure you can call other methods of your bean.
How are you invoking it? How does it print out the 'parameters'?
What you might try is wrapping it in your own exception code to see what happens.
You will need to import java.io.PrintWriter to get this to work.
<%@ page import="java.io.PrintWriter" %>
<%
try{
call your method...
catch (Throwable t){
%>
ERROR IN MY CODE HERE <br>
<pre><% t.printStackTrace(new PrintWriter(out));%></pre>
<%
%>(Yes I know this code is ugly, but it does work for me)
Similar Messages
-
HELP! - BEAN and CLASS interchange?
When I setup to a bean like:
<jsp:useBean id="logger" scope="application" class="Logger" />
I can use the bean and bean's functions fine in the JSP, but not within functions that exist in the JSP like:
jspInit()
it says the "logger" is undefined. Is there a way I can access the logger function within the jspInit class or do i have to redefine a new instance of "logger" within jspInit().
The whole point is I would like to use the same instance of the class from all the JSPs. Thats what scope=application seems to do instead of instantiating everytime.
P.S. If I were to instantiate a class like:
Logger logger = new Logger;
would I be able to give it "applicate scope"? like a bean can have?
Really long question, thanks a lot for the help. :)Hi yusufm1,
I can use the bean and bean's functions fine in the JSP, but not within functions that exist in the JSP like:
jspInit()it says the "logger" is undefined.
What ever you write in jsp, other than in <%! %> tags, is a part of _jspService() method. The life cycle of jsp has following 3 steps.
1. jspInit()
2. _jspService()
3. jspDestroy()
jspInit() is the first method of the jsp class that is executed. _jspService is the next method. The statement -
<jsp:useBean id="logger" scope="application" class="Logger" />
instantiates a bean in _jspService() method of jsp class. So it is evident that this instance is not available in jspInit().method.
Is there a way I can access the logger function within the jspInit class or do i have to redefine a new instance of "logger" within jspInit().
To use the bean instance in jspInit() you should instantiate the bean object in jspInit() or declare it as an instance variable.
If I were to instantiate a class like:
Logger logger = new Logger;
would I be able to give it "applicate scope"? like a bean can have?
No, simply instantiating a class in the jspInit() method wouldnot provide it with application scope. You have to put that instance in ServletContext (application) to make it available to all jsp pages. If you instantiate a class in jspInit() only and donot put it in application it is not even available to _jspService() method.
Hope this helps -
What is exact diff between Bean and Class
As my knowledge...
Class should not depends on any specified rules..But Bean should specified on specified rules, like setters and getters....
is there any more........
thanks for giving help..........Yes, but what are they good for, except for providing
examples of really bad OO design by just being a
complicated struct?Look at Spring; an extremely powerful application configuration tool (and much, much more); all possible because of JavaBean conventions. Otherwise Spring would have had one set of conventions, JSF another, Hibernate another still, making programmers' lives difficult.
Look at the PropertyEditorSupport class - it's fantastic that I can write a standardized String-to-instance-to-String class for a particular type and just have frameworks like Spring take care of the problems generating my domain model from configuration. Using a standard mechanism makes me confident that if, in the future, I ditch Spring, my bespoke property editors will not be obsolete. -
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" %>
<!-- Instantiate the Counter bean with an id of "counter" -->
<jsp:useBean id="cart" scope="session" class="ShoppingCart" />
<html>
<head><title>Shopping Cart</title></head>
<body bgcolor="#FFFFFF">
Your cart's ID is: <%=cart.getId()%>.
</body>
<html>
</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 -
First use of jsp and java bean and "Unable to compile class for JSP" error
Hi,
I am trying to create my first jsp + java bean and I get a basic error (but I have no clue what it depends on exactly). Tomcat seems to cannot find my class file in the path. Maybe it is because I did not create a web.xml file. Did I forgot to put a line in my jsp file to import my bean?
Thank you very much for your help.
Here is my error:
An error occurred at line: 2 in the jsp file: /login.jsp
Generated servlet error:
[javac] Compiling 1 source file
/usr/local/tomcat/jakarta-tomcat-5/build/work/Catalina/localhost/test/org/apache/jsp/login_jsp.java:43: cannot resolve symbol
symbol : class CMBConnect
location: class org.apache.jsp.login_jsp
CMBConnect test = null;
I only have this in my directory:
test/login.jsp
test/WEB-INF/classes/CMBConnect.java
test/WEB-INF/classes/CMBConnect.class
Do I need to declare another directory in classes to put my class file in it and package my bean differently?
Here is my login.jsp:
<%@ page errorPage="error.jsp" %>
<jsp:useBean id="test" type="CMBConnect" scope="session" />
<html>
<head>
<title>my test</title>
</head>
<body>
<h3>Login information</h3>
<b><%=session.getValue("customerinfo.message")%></b>
<form> ....... </form>
</body>
</html>
and here is my CMBConnect.java:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class CMBConnect
public CMBConnect () { }
public String openConnection(String id, String password) {
String returnText = "";
try {
Connection con = null;
DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
con = DriverManager.getConnection("jdbc:oracle:thin:@myserver.abc.com:1521:TEST", id, password);
if(con.isClosed())
returnText = "Cannot connect to Oracle server using TCP/IP...";
else
returnText = "Connection successful";
} catch (Exception e) { returnText = returnText + e; }
return returnText;
Thanks again!Thanks for you help
I created the package and I get this error this time:
javax.servlet.ServletException: bean test not found within scope
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:822)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:755)
org.apache.jsp.login_jsp._jspService(login_jsp.java:68)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:268)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:277)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:223)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856) -
What jar file contains oracle.ifs.beans and oracle.ifs.clients classes?
I am trying to build some code which needs oracle.ifs.beans and oracle.ifs.clients packages and classes. I have downloaded the following:
OracleAdministrativeClientUtility
OracleApplicationServer
OracleContentManagementSDK
OracleIIOPClientLibrary
OracleJDeveloper
OracleRMIClientSideLibrary
OracleSOA
OracleWebServicesClientLibrary
None of these appears to contain the oracle.ifs packages.oracle.ifs.beans and oracle.ifs.clients packages are for the Oracle Internet File System. Are the following JAR files available?
repos.jar
adk.jar -
Is there any difference between java Beans and general class library?
Hello,
I know a Java Bean is just a java object. But also a general class instance is also a java object. So can you tell me difference between a java bean and a general class instance? Or are the two just the same?
I assume a certain class is ("abc.class")
Second question is is it correct that we must only use the tag <jsp:useBean id="obj" class="abc.class" scope="page" /> when we are writng jsp program which engage in using a class?Any other way to use a class( create object)? such as use the java keyword "new" inside jsp program?
JohnWen604
19-July-2005a bean is a Java class, but a Java class does not have to be a bean. In other words a bean in a specific Java class and has rules that have to be followed before you have a bean--like a no argument constructor. There are many other features of beans that you may implement if you so choose, but read over the bean tutorial and you'll see, there is a lot to a bean that is just not there for many of the Java classes.
Second question: I'll defer to someone else, I do way to little JSP's to be able to say "must only[\b]". -
Error: 500 Cannot create bean of class Simulation
Hello, I was working with J2ee 1.2 and suddenly I got this error. Any one has an idea about it?, I can't continue working.
Thanks...
Error: 500
Internal Servlet Error:
javax.servlet.ServletException: Cannot create bean of class Simulation
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:384)
at _0005csimulation_0002ejspsimulation_jsp_325._jspService(_0005csimulation_0002ejspsimulation_jsp_325.java:215)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:247)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
at java.lang.Thread.run(Thread.java:484)
Root cause:
javax.servlet.ServletException: Cannot create bean of class Simulation
at _0005csimulation_0002ejspsimulation_jsp_325._jspService(_0005csimulation_0002ejspsimulation_jsp_325.java:79)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:161)
at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:247)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:352)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:865)
at org.apache.tomcat.core.ServiceInvocationHandler.method(ServletWrapper.java:626)
at org.apache.tomcat.core.ServletWrapper.handleInvocation(ServletWrapper.java:534)
at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:378)
at org.apache.tomcat.core.Context.handleRequest(Context.java:644)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:440)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:144)
at org.apache.tomcat.service.TcpConnectionThread.run(TcpEndpoint.java:310)
at java.lang.Thread.run(Thread.java:484)This is the code for the simulatin class.
I think nothing special.
Begin --- Simulation.java
import java.io.*;
import java.util.*;
public class Simulation
private int lastMessage;
private int transactions;
private int transaction_prospere;
/* Creation des variables du system */
private String Quantite_acheteurs;
private String Quantite_vendeurs;
private String Argent_initiale;
private String Articles_initiales;
private String Prix_initial;
private String Mechants_acheteurs;
private String Mechants_vendeurs;
private String Cycles_simulation;
private String Choisir_strategie;
private String Choisir_formule;
private String Afficher_resultats;
int iAfficher_resultats = (new Integer(Afficher_resultats)).intValue();
/* Section de declaration des constants */
private int OFFRE_DE_VENTE = 0;
private int DEMANDE_ACHAT = 1;
private int BROADCAST = -1;
private int TRICHEUR = -1;
private int PROSPERE = 1;
private int VRAI = 1;
private int FAUX = 0;
private int ACHETEUR = 0;
private int VENDEUR = 1;
private int GENTIL = 0;
private int MECHANT = 1;
private double SEUIL_MECHANT = 0.87;
Messages message_anterieur= null;
/*** PADOVAN ********************************/
public String Padovan_alpha;
Begin --- Creation des agents...
Pour la creation des agents il y a une generation des chiffres aleatoires
pour repartir les vendeurs et les acheteurs, ainsi que les gentils et les
mechants dans le vecteur d'agents
public Vector Creation_des_agents(){
System.out.println ("<<<<<<<<<<Executing...Creation_des_agents>>>>>>>>");
/* Le vector avec des agents....*/
Vector agents = new Vector();
lastMessage = 0; /* Le derni�re message ajout� au tableau */
transactions = 0; /* Compteur pour les transactions */
transaction_prospere = 0; /* Compteur pour les transaction prosp�res*/
/* Conversion de variables de string a int */
int iQuantite_acheteurs = (new Integer(Quantite_acheteurs)).intValue();
int iQuantite_vendeurs = (new Integer(Quantite_vendeurs)).intValue();
int iArgent_initiale = (new Integer(Argent_initiale)).intValue();
int iArticles_initiales = (new Integer(Articles_initiales)).intValue();
int iPrix_initial = (new Integer(Prix_initial)).intValue();
int iMechants_acheteurs = (new Integer(Mechants_acheteurs)).intValue();
int iMechants_vendeurs = (new Integer(Mechants_vendeurs)).intValue();
int i; /* Compteur pour la generation des agents */
double agent_type; /* Pour generation aleatoire et savoir si est acheteur ou vendeur */
int iagent_type; /* Type d'agent acheteur=0, vendeur=1 */
double agent_comportement; /* Pour generation aleatoire et savoir si est gentil ou mechant */
int iagent_comportement; /* Comportement de l'agent 0=gentil, 1=mechant, gentil par default */
int total=iQuantite_acheteurs+iQuantite_vendeurs;
/* Pour les agents......... */
int j=0;
for (i=0;i<total;)
iagent_comportement = 0;
j++;
agent_type=Math.random(); /* Pour repartir les agentes vendeurs et acheteurs aleatoirement. */
iagent_type=(agent_type<0.5?0:1); /* 0-> acheteur, 1-> vendeur */
if (iagent_type==0){ /*Creation des acheteurs.... */
if(iQuantite_acheteurs>0)
iQuantite_acheteurs--; /* un acheteur de moins */
/* Generation du comportement */
if (iMechants_acheteurs>0) /* Faltan generar agentes mechantes */
if ((iQuantite_acheteurs > iMechants_acheteurs))
agent_comportement = Math.random(); /* Pour repartir les comportement de l'agent */
iagent_comportement=(agent_comportement<0.5?0:1); /* 0->gentil, 1->mechant */
else
iagent_comportement=1;
if (iagent_comportement==1) /* S'il est mechante... */
iMechants_acheteurs --;
Agents agent = new Agents(i,ACHETEUR,0,0,iArgent_initiale,iagent_comportement, total);
agent.setPadovan_alpha(Padovan_alpha);
i++;
agents.addElement(agent);
else{ /* Creation des vendeurs... */
if(iQuantite_vendeurs>0)
iQuantite_vendeurs--; /* un vendeur de moins */
/* Generation du comportement */
if (iMechants_vendeurs>0) /*Faltan generar agentes mechantes */
if ((iQuantite_vendeurs > iMechants_vendeurs))
agent_comportement = Math.random(); /* Pour repartir les comportement de l'agent */
iagent_comportement=(agent_comportement<0.5?0:1); /* 0->gentil, 1->mechant */
else
iagent_comportement=1;
if (iagent_comportement==1) /* S'il est mechante... */
iMechants_vendeurs --;
Agents agent = new Agents(i,VENDEUR,iArticles_initiales,iPrix_initial,0,iagent_comportement,total);
agent.setPadovan_alpha(Padovan_alpha);
i++;
agents.addElement(agent);
}/* End for */
System.out.println ("<<<<<<<<<<Ending...Creation_des_agents>>>>>>>>>>");
return agents;
} /* End Creation_des_agents */
End --- Creation des agents...
Begin --- Setters and getters.........
public void setQuantite_acheteurs(String Quantite_acheteurs) {
this.Quantite_acheteurs= Quantite_acheteurs;
public void setQuantite_vendeurs(String Quantite_vendeurs) {
this.Quantite_vendeurs= Quantite_vendeurs;
public void setArgent_initiale(String Argent_initiale) {
this.Argent_initiale= Argent_initiale;
public void setArticles_initiales(String Articles_initiales) {
this.Articles_initiales= Articles_initiales;
public void setPrix_initial(String Prix_initial) {
this.Prix_initial= Prix_initial;
public void setMechants_acheteurs(String Mechants_acheteurs) {
this.Mechants_acheteurs= Mechants_acheteurs;
public void setMechants_vendeurs(String Mechants_vendeurs) {
this.Mechants_vendeurs= Mechants_vendeurs;
public void setCycles_simulation(String Cycles_simulation) {
this.Cycles_simulation= Cycles_simulation;
public void setChoisir_strategie(String Choisir_strategie) {
this.Choisir_strategie= Choisir_strategie;
public void setChoisir_formule(String Choisir_formule) {
this.Choisir_formule= Choisir_formule;
public void setPadovan_alpha(String Padovan_alpha) {
this.Padovan_alpha= Padovan_alpha;
public void setAfficher_resultats(String Afficher_resultats) {
this.Afficher_resultats= Afficher_resultats;
public String getPadovan_alpha( ){
return this.Padovan_alpha;
} // End of the class Simulation
End --- Simulation -
Message Driven Bean and Distributed transaction
Hi ALL
I am developing an asynchronous application using MDB. My application flow is as follows:
1. From MDB onMessage i am calling a method MethodA that
a. calls a simple pojo1 where I am getting a Connection on XA enable datasource1 and executing Stored Procedure1 of DatabaseSchema1.
b. In that pojo without committing m closing the connection and coming back in MethodA.
c. Again from MethodA m calling a different pojo2 where I am getting a new Connection on XA enable datasource2 and executing Stored Procedure2 of
DatabaseSchema1. In this pojo also without committing m closing the connection and coming back in MethodA.
d. Again from MethodA m calling pojo1 where I am getting a new Connection on XA enable datasource1 and executing a different function of Stored Procedure1 of DatabaseSchema1.
Public class MDB{
Public void onMessage(��.)
Try{
Method1();
Catch(Exception x)
mdbcontext.setRollbackOnly();
Private void MethodA()
Call pojo1;
Call pojo2
Pojo1
Public void CallSP1()
Get connection from Datasource1 (shema1,user1, pwd1);
Call sp1();
//return without commit;
Pojo2
Public void CallSP2()
Get connection from Datasource2 (shema1,user2, pwd2);
Call sp2();
//return without commit;
SP1:
Insert table1
Savepoint 1
Insert into Table1
Rollback to 1
Insert a row
End SP1 (without commit)
SP2:
Insert table2
Savepoint 2
Update table2
Rollback to 2
Insert table2
End SP2 (without commit)
In ejb-jar.xml
Transaction type is Container
Transaction attribute is Required for all
Now problem is:
Case 1: success case when no exception is there at Java layer
SP1 works fine I mean there is only 2 inserts in Table 1
But In SP2 there are 3 inserts
Case 2: if an exception comes at Java layer
SP1 is fine
Rollback is not happening in SP2
In ejb-jar.xml transaction attributes is Required for all methods and transaction type is Container.
Backend is Oracle 10g and init.xa has already been run on that.
Will be very obliged if can have a single hint of the problem.
Both datasource are XA enable
Backend is Oracle 10g
Application server is WAS 6.0
Queue is WAS MQ 6.0
Thanks{color:#008000}Hi Friends,
Thought of updating the answers for my questions in case somebody else would find it helpful.
{color}
{color:#999999}{color:#00ccff}I'm trying to make message driven bean and use the OnListener method.
But since I'm doing this for the first time I have very limited knowledge.
The following are my doubts :
1. Should I have a main function while using the MDB?{color}
{color:#008000} There is no need for any main function.{color}
{color:#00ccff}2. Is it mandatory to have JNDI setup done?
{color} {color}{color:#008000} There is no need for any JNDI setup done. But you need to configure the details on the
Websphere by creating valid entries inside Resources namely -
Queue Connection Factory, Queues and Listener Ports under the server.
Thanks,
Arun Prithviraj{color} -
Javax.servlet.jsp.JspException: Exception creating bean of class ProdFormFB
Hi I am trying to deploy a struts based web application using "DynaActionForms"
When I am trying to access the jsp page I am getting the following error.
I am providing as much as details as it can help full to u.
Thank u.
FormBean class ProdFormFB.java
========================================================================
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class ProdFormFB extends DynaActionForm
public void reset(ActionMapping mapping, HttpServletRequest request)
System.out.println("reset() called. . . . ");
set("prodId", new Integer(10));
set("prodName", new String("XYZ"));
set("price", new Float(22.25));
public ActionErrors validate(ActionMapping mappings, HttpServletRequest request)
System.out.println("=== validate() called ===");
ActionErrors aes=new ActionErrors();
System.out.println("aes.size() ===> "+aes.size());
String prodName = (String)get("prodName");
if( prodName==null || prodName.equals("") )
System.out.println("Adding prodName.req error . . . . . . .");
aes.add("prodName",new ActionError ("prodName.req.error"));
return aes;
========================================================================
Action Class ProdAction.java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import org.apache.struts.action.*;
public class ProdAction extends Action
public ActionForward execute(ActionMapping mapping,ActionForm form, HttpServletRequest request,HttpServletResponse response)throws Exception
ProdFormFB fb = (ProdFormFB)form;
System.out.println("fb.get('prodId')==> "+fb.get("prodId"));
System.out.println("fb.get('prodName')==> "+fb.get("prodName"));
System.out.println("fb.get('price')==> "+fb.get("price"));
return mapping.findForward("dres");
}========================================================================
jsp page : npform.jsp
<%@ taglib uri = "/tags/struts-html" prefix="html"%>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<html:html>
<head>
<title>Product Form</title>
</head>
<body>
<html:form action="/pAction">
<center>
<br><br>
<center> <font color="green" style="bold" size=5>Product Form using Struts</font></center><br><br>
<table>
<tr>
<td>
<b> Product ID : </b> <html:text property="prodId"/> </td><td><font color="red" style="bold"><html:errors property="prodId"/> </font>
</td>
</tr>
<tr>
<td>
<b> Prod Name : </b> <html:text property="prodName"/> </td><td> <font color="red" style="bold"> <html:errors property="prodName"/> </font>
</td>
</tr>
<!-- <tr>
<td>
<b> Price : </b> <html:text property="price"/> </td><td> <font color="red" style="bold"> <html:errors property="price"/> </font>
</td>
</tr> -->
<tr colspan="2" align="center">
<td>
<html:submit property="submit" value="Store"/>
</td>
</tr>
</table>
</center>
</html:form>
</body>
</html:html>========================================================================
Configuration in struts-config.jsp
<form-beans>
<form-bean name="NewProdForm" type="ProdFormFB">
<form-property name="prodId" type="java.land.Integer"/>
<form-property name="prodName" type="java.land.String"/>
<form-property name="price" type="java.land.Float"/>
</form-bean>
</form-beans>
<action-mappings>
<action name="NewProdForm" path="/pAction" type="ProdAction" input="/npform.jsp" validate="true" scope="request">
<forward name="dres" path="/dres.jsp"/>
</action>
</action-mappings>========================================================================
After deploying successfully I am I am entering the following URL
http://localhost:7001/oursapp/npform.jsp
The following Exception on Browser: and also on the server console ......
javax.servlet.jsp.JspException: Exception creating bean of class ProdFormFB: {1}
at org.apache.struts.taglib.html.FormTag.initFormBean(FormTag.java:463)
at org.apache.struts.taglib.html.FormTag.doStartTag(FormTag.java:433)
at jsp_servlet.__npform._jspService(__npform.java:178)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1006)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419)
at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6718)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Plz... Help me out is solving the problem .......
my email : [email protected]I never used DynaActionForm, what I have noticed here is, don't you need to declare the form bean? I may be wrong.
<form-beans>
<form-bean name="newProdForm" type="com.package.form.NewProdForm"></form-bean>
</form-beans> -
Hi..
I am trying to pass a 2D String array to a Java Bean and i am getting
"java.lang.NoSuchMethodError"
Any Ideas?
Thanks
Joe
Jsp Call
Sorts s = new Sorts();
s.getTotal(items);
"items[][]" is a 2 dimentional arrays and size can vary..
Java Bean
public class Sorts implements Serializable {
public double getTotal(String sItems[][]){
double aSum=0;
for(int i=0;i<sItems[0].length;i++){
aSum=aSum+(Double.parseDouble(sItems[1])*Double.parseDouble(sItems[2][i]));
return aSum;Can someone show me how to pass a 2 Dimentional Array to a Java Bean method? obviously i am doing something wrong.
Joe
Hi..
I am trying to pass a 2D String array to a Java Bean
and i am getting
"java.lang.NoSuchMethodError"
Any Ideas?
Thanks
Joe
Jsp Call
Sorts s = new Sorts();
s.getTotal(items);
"items[][]" is a 2 dimentional arrays and size can
vary..
Java Bean
public class Sorts implements Serializable {
public double getTotal(String sItems[][]){
double aSum=0;
for(int i=0;i<sItems[0].length;i++){
aSum=aSum+(Double.parseDouble(sItems[1])*Double.pars
Double(sItems[2][i]));
return aSum; -
Javax.servlet.ServletException: Cannot create bean of class
People,
HELP!! I am getting desperate!!!
I am a newbie when it comes to TOMCAT, but i have been using Blazix before.
My current system is using APACHE/TOMCAT on a Solaris machine and I keep hitting the same problem. I have gone through the archives but the only thing it states is to check the directory which i have done.
I keep getting:
Error 500
Internal Error
javax.servlet.ServletException: Cannot create bean of class MyClass
The code used to work on the Blazix server so i am assuming it is something to do with a config parameter somewhere - but i do not know where. I have checked the directory/package structure and they seem to work. It even serves it when they are html pages not jsp, but obviously wont use the bean. :(
I can post code if necessary.
Please help
SteveThe FormData.class file is in examples/WEB-INF/classes/ directory.
Is this wrong? then should it be in a package called examples.steve???
<TITLE> Poc </TITLE>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<META NAME="Generator" CONTENT="Mozilla/4.61 [en] (WinNT; I) [Netscape]">
<META NAME="Author" CONTENT="Steve Brodie">
<META NAME="Proof of Concept order entry system" CONTENT="">
<META NAME="PROOF OF CONCEPT ORDER ENTRY SYSTEM " CONTENT="">
</HEAD>
<%@ page import="steve.FormData" %>
<jsp:useBean id="user" class="steve.FormData"/>
<jsp:setProperty name="user" property="*"/>
<FORM METHOD=POST ACTION="SaveDetails.jsp">
<CENTER>
<H1>
POC CNS demo <BR>
POC Order Entry System <BR></H1>
<H2><CENTER>PROOF OF CONCEPT ORDER ENTRY SYSTEM <BR>
in order to illustrate the use of an new product<BR></H1>
</CENTER>
<BODY>
Please enter the following details: <BR>
Second name <INPUT TYPE=TEXT NAME=secondName SIZE=20><BR>
First name <INPUT TYPE=TEXT NAME=firstName SIZE=20><BR>
Address <INPUT TYPE=TEXT NAME=address1 SIZE=20><BR>
Address <INPUT TYPE=TEXT NAME=address2 SIZE=20><BR>
Post Code <INPUT TYPE=TEXT NAME=postCode SIZE=10><BR>
Phone NO. <INPUT TYPE=TEXT NAME=phone SIZE=10><BR>
<BR>
Credit Card<INPUT TYPE=TEXT NAME=credit SIZE=15><BR>
<BR>
Quality of Service:
<SELECT TYPE=TEXT NAME="QoS">
<OPTION SELECTED TYPE=TEXT NAME=Gold>Gold <BR>
<OPTION TYPE=TEXT NAME=Silver>Silver <BR>
<OPTION TYPE=TEXT NAME=Bronze>Bronze <BR>
</SELECT>
<BR>
<BR>
<INPUT TYPE=RESET>
<P><INPUT TYPE=SUBMIT>
<BR>
<BR>
<IMG SRC=../images/Cisco.gif>
</FORM>
</BODY>
</HTML>
package steve;
* @author Steven Brodie
* @date
* @version 0.0
import java.io.*;
import java.lang.*;
import java.util.*;
public class FormData {
String secondName = null;
String firstName = null;
String address1 = null;
String address2 = null;
String postCode = null;
int credit = 0;
int phone = 0;
String qos = null;
String file = "out";
String filex = "xout";
PrintWriter pout = null;
PrintWriter xout = null;
FormData() {
try {
pout = new PrintWriter(new BufferedWriter(new FileWriter(file + ".txt")));
xout = new PrintWriter(new BufferedWriter(new FileWriter(filex + ".xml")));
xout.println("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
xout.println("<OrderEntry xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"");
xout.println("xsi:noNamespaceSchemaLocation=\"http://machine2.com:8080/xml/xsd/OrderEntry.xsd\">");
} catch (IOException ioe) {
System.err.println("DataFileWriter error ioe on init");
ioe.printStackTrace();
System.exit(1);
public void setFirstName( String value ) {
firstName = value;
System.out.println(firstName);
pout.println(firstName);
xout.println("<firstname value= \"" + firstName + "\"/>");
public void setSecondName( String value ) {
secondName = value;
System.out.println(secondName);
pout.println(secondName);
xout.println("<secondname value= \"" + secondName + "\"/>");
public void setAddress1( String value ) {
address1 = value;
System.out.println(address1);
pout.println(address1);
xout.println("<address1 value= \"" + address1 + "\"/>");
public void setAddress2( String value ) {
address2 = value;
System.out.println(address2);
pout.println(address2);
xout.println("<address2 value= \"" + address2 + "\"/>");
public void setPostCode( String value ) {
postCode = value;
System.out.println(postCode);
pout.println(postCode);
xout.println("<postCode value= \"" + postCode + "\"/>");
public void setCredit( int value ) {
credit = value;
System.out.println(credit);
pout.println(credit);
xout.println("<creditCard value= \"" + credit + "\"/>");
public void setPhone( int value) {
phone = value;
System.out.println("0" + phone);
pout.println("0" + phone);
xout.println("<phoneNo value= \"0" + phone + "\"/>");
public void setQoS( String value ) {
qos = value;
System.out.println(qos);
pout.println(qos);
xout.println("<QoS value= \"" + qos + "\"/>");
xout.println("</OrderEntry>");
pout.flush();
pout.close();
xout.flush();
xout.close();
public String getFirstName() {
return firstName;
public String getSecondName() {
return secondName;
public String getAddress1() {
return address1;
public String getAddress2() {
return address2;
public String getPostCode() {
return postCode;
public int getCredit() {
return credit;
public int getPhone() {
return phone;
public String getQoS() {
return qos; -
Is there a bean or class framework for DatabaseSession?
Looking for a bean or class framework that supports a rather conventional 2-tier rich client/forms-type application.
Ideally (1) a bean encapsulating DatabaseSession to support QBE, navigation, insert, and delete functions over a Collection specified as a parameter to the bean; (2) a bean implemting a JToolBar to drive the first bean; and (3) document models to connect the object Collection to Swing widgets.
Anyone have or know of such a framework?
Thanks,
GeraldI was just wondering the same thing. With the new Facebook and Twitter integration, it seems to me that it should be the next logical step for iTunes.
Also, i love iCloud and iTunes Match, however, with this "cloud" technology now available and working great, I'd like to see iTunes move in a direction similar to Spotify. At this point, I don't see why (if I have all my music physically stored in my home computer) I have to re-download it into my devices (iPhone and iPad) to listen to it remotely... It should simply stream right from the cloud, and not actually take up precious space in your devices... This would be a great fix...
I use iTunes a lot because I use it to maintain my music collection, which I have built up over the years, but to be honest, I haven't downloaded an album or song since I became a member of Spotify about a year ago. Its just less of a hassle. No need to back up your music files because of the fear that you might lose them all, a thought which would sometimes keep me up at night... (It happened to my brother). With Spotify, all the music in the world is just there... being administered by someone else... all you have to do is hit play... and pay the monthly fee, of course...
Anyways, sorry for the long speech... -
JavaBean Models, Command Bean and J2EE Design Pattern
Hello,
I have read the available "How To", Using EJBs in Web Dynpro Applications where the author mentions that one should use a Command Bean (according to J2EE Design Patterns) so that one can invoke business methods in a Session Bean from our Web Dynpro Application. Well, although, I have read some available articles in the internet about J2EE design patterns, I still have some questions about command beans and its usage in Web Dynpro applications.
I have developed a WD App which uses EJBs to read data from the DB.
Let's suppose I only have two tables: BOOKS and AUTHORS.
Lets also suppose I have to Entity Beans (one for each table) and a Session Bean with two methods: Book[] getAllBooks() and Author[] getAllAuthors();
I also have a Command Bean which I imported in my WD App.
My questions are:
How should I design my Command Bean?
Can I have only one Command Bean with two methods each calling one of the methods of the Session Bean?
Or instead should I design two Command Beans, one for each call?
In the last case do the methods must be named <b>execute</b> or can I name them whatever I want?
Furthermore, how should I store the data in my command bean? In instance variables?
If so, can I use array of a class representing a record in the database table (for instance, classes Book and Author) or do I have to store the data in a generic collection (such as ArrayList for instance)?
I ask this last question because if I try to store the data in an array when I am importing the Command Bean as a JavaBean model I always get an error.
One last question: Can the Command Bean execute method directly return the data or should I always store the data in an instance variable an then get it using getter methods?
I know this questions are more about J2EE Design Patterns and JavaBeans specification than they are about Web Dynpro but I also have doubts about the rules that the command bean must obey in order to accomplish a successful JavaBean model import in WD.
Some guidance or tips would be highly appreciated.
King RegardsI have the same problem.
Does anyone know the solution?
Thanks
Davide -
Stateless session beans and idle timeouts (weblogic 10.3.1)
Need clarification about stateless session beans and the idle-timeout-seconds setting.
Situation is this – we have a process that is timing out due to an API call to a very slow Authentication server.
I am trying to resolve this with a code change, but need to further other understand what the server is actually doing.
We have a session bean which calls another which is calling a util class that does all the work and returns the results back up to the initial session bean. I have left out the ejbName in these examples (it’s irrelevant here).
Example:
SessionBean1 // basically called just once a day
@Session(defaultTransaction = Constants.TransactionAttribute.SUPPORTS,
enableCallByReference = Constants.Bool.TRUE,
type = Session.SessionType.STATELESS,
transTimeoutSeconds = "0",
initialBeansInFreePool = "0",
maxBeansInFreePool = "20")
Methods
@RemoteMethod() public boolean getUserList(String adminGroup) {
Map usrList = getUserList(adminGroup);
Private Map getUserList(String adminGroup) {
return SessionBean2.getUsers(adminGroup);
SessonBean2
@Session(defaultTransaction = Constants.TransactionAttribute.SUPPORTS,
enableCallByReference = Constants.Bool.TRUE,
type = Session.SessionType.STATELESS,
transTimeoutSeconds = "0",
initialBeansInFreePool = "3",
maxBeansInFreePool = "20")
Method
@RemoteMethod() public Map getUsers(String adminGroup) throws RemoteException {
return javaUtilClass.getUsers(adminGroup);
JavaUtilClass
Method
public Map getUsers(String adminGroup) throws RemoteException {
// This is where the work happens, calling the Authentication server to get a complete
// list of users for an admin group. When the user list is around 1500 entries, this can
// take an hour. Did I mention this server is very slow? It’s about this threshold of 1500
// that causes the timeout.
return Map of users
First thought, just bump the idle-timeout-seconds setting for the session beans (from the default 600), but that would be a temporary solution until the user list grew larger.
Second thought, refactor the call to the Authentication Server API to get the user list in blocks of data (say 400 at a time) and decreasing the call/response time between the method getUsers and the API call. This would still occur in the JavaUtilClass, so I am unsure this would make a difference. The session beans would still be idle and subject to timeout, correct?
Would setting initialBeansInFreePool to 1 in SessionBean1 make any difference?
Or should I be looking at replicating the re-factored method from the JavaUtilClass in SessionBean1 where the user list is being used so that the API calls come back to it and keep it 'active'?
Thanks for any advice you could give me on this.Hi
regarding timeouts, there are two ways:
1.- Changing the settings in the JTA WebLogic domain , called "Timeout Seconds". This will affect globally to all EJB deployed in the domain.
or
2.- Specified directly in the bean with a weblogic annotation, like this:
@TransactionTimeoutSeconds(value = 300)I hope this will help you.
Regards.
Felipe
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