Java class versus Bean
In terms of implementation, what are the main differences between an ordinary class and a bean? Also,can we use an ordinary class for JSP pages in "useBean:" ?
In terms of implementation, what are the main
differences between an ordinary class and a bean?Beans have getter and setter methods while a class might not have them
Also,can we use an ordinary class for JSP pages in
"useBean:" ?yes you can. try it out
npaila
Similar Messages
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Difference b/w Java Class and Bean class
hi,
can anybody please tell me the clear difference between ordinary java class and java Bean class. i know that bean is also a java class but i donno the exact difference between the both.
can anybody please do help me in understanding the concept behind the bean class.
Thank u in advance.
Regards,
FazlinaWhile researching this question, I came across this answer by Kim Fowler. I think it explains it better than any other answer I have seen in the forum.
Many thanks Kim
Hi
Luckily in the java world the definition of components is a little
less severe than when using COM (I also have, and still occasionaly
do, worked in the COM world)
Firstly there are two definitions that need to be clarified and
separated: JavaBean and EnterpriseJavaBean (EJB)
EJB are the high end, enterprise level, support for distributed
component architectures. They are roughly equivalent to the use of MTS
components in the COM/ COM+ world. They can only run within an EJB
server and provide support, via the server, for functionality such as
object pooling, scalability, security, transactions etc. In order to
hook into this ability EJB have sets of interfaces that they are
required to support
JavaBeans are standard Java Classes that follow a set of rules:
a) Hava a public, no argument constructor
b) follow a naming patterns such that all accessor and modifier
functions begin with set/ get or is, e.g.
public void setAge( int x)
public int getAge()
The system can then use a mechanism known as 'reflection/
introspection' to determine the properties of a JavaBean, literally
interacting with the class file to find its method and constructor
signatures, in the example above the JavaBean would end with a single
property named 'age' and of type 'int' The system simply drops the
'set' 'get' or 'is' prefix, switches the first letter to lower case
and deduces the property type via the method definition.
Event support is handled in a similar manner, the system looks for
methods similar to
addFredListener(...)
addXXXListener
means the JavaBean supports Fred and XXX events, this information is
particularly useful for Visual builder tools
In addition there is the abiliity to define a "BeanInfo' class that
explicitly defines the above information giving the capability to hide
methods, change names etc. this can also be used in the case where you
cannot, for one reason or another, use the naming patterns.
Finally the JavaBean can optionally - though usually does - support
the Serializable interface to allow persistence of state.
As well as standard application programming, JavaBeans are regularly
used in the interaction between Servlets and JSP giving the java
developer the ability to ceate ojbect using standard java whilst the
JSP developer can potentially use JSP markup tags to interact in a
more property based mechanism. EJB are heaviliy used in Enterprise
application to allow the robust distribution of process
HTH.
Kim -
Java class bean can not access to DB in JSP file
Hi, I wrote a java class bean in order to access to MySql database ,and this bean is used in a JSP file,so that the bean can query from DB and then display the queried information on the JSP file,but it can not work correctly,the following is the source code and error message popup by the system,
does anybody has experience in solving thus question,Please reply ,Thank you for your help.
%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import = "java.sql.*" %>
<jsp:useBean id="conn" scope="page" class="news.conn"/>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>1</title>
<style>
<!--
A:link {
COLOR: #993399
.s {
FONT-SIZE: 13px; LINE-HEIGHT: 170%; FONT-FAMILY: "utf-8"
-->
</style>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber1">
<tr>
<td width="100%">
<img border="0" src="images/ruanjian.jpg" width="770" height="154"></td>
</tr>
<tr>
<td width="100%">@</td>
</tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" bordercolor="#111111" width="100%" id="AutoNumber2">
<tr>
<td width="13%">@</td>
<td width="87%">
<img border="0" src="images/mid-rdxw2.gif" width="101" height="18"><p>
<%
ResultSet rs,rsNest;
String strSql=null;
strSql = "select * from news where TYPE=1";
rs = conn.executeQuery(strSql);
while (rs.next()){
%>
<span class="s"> <a href="newsContent.jsp?newsId=<%=rs.getInt(id")%">"><%=rs.getString("Title")%></a><br>
<%
%>
<p>
<img border="0" src="images/mid-hyxw2.gif" width="94" height="19"></p>
<%
strSql="select * from news where TYPE=2";
rs = conn.executeQuery(strSql);
while (rs.next()){
%>
<span class="s"> <a href="newsContent.jsp?newsId=<%=rs.getInt("id")%>"><%=rs.getString("Title")%></a><br>
<%
%>
<p>@</td>
</tr>
</table>
<p align="center">Study Online</p>
<p align="center">@</p>
</body>
</html>
Error message:
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Exception in JSP: /newsMain.jsp:47
44: strSql = "select * from news where TYPE=1";
45: rs = conn.executeQuery(strSql);
46:
47: while (rs.next()){
48:
49: %>
50:
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:451)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
root cause
java.lang.NullPointerException
org.apache.jsp.newsMain_jsp._jspService(newsMain_jsp.java:98)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.27 l</a>nogoodatcoding wrote:
Tolls wrote:
Is that Jasper Exception telling us where the problem is in the jsp, though?
If it is, then "rs" is null in the call rs.next()...which means conn.executeQuery() is returning null. Which means that whatever class conn is (news.conn?) has a problem maybe?That's possible. Though, it may just be the case that the 'conn' object itself is null! That line is the first place where it's being used and there are no checks that I can see...we'll have to wait for the OP to investigate and reply I guess.That's what I originally thought, then I noticed it was saying line 47, which is the rs.next() line. Assuming Jasper is correct in its choice of line, then it's the rs that's null. Which means the conn is doing strange things.
Edit: Now that I think about it, going by the previous thread the OP posted, I'm wondering whether news.conn class is their attempt to move the JDBC stuff out of the JSP page, and it's grabbing the "real" connection (java.sql.Connection) and getting the result set and returning it...or getting something wrong and returning null.
Edited by: Tolls on 11-Jun-2009 12:24 -
Any difference in creating a web service from a java class or session bean?
Hi,
The JDeveloper tutorial at http://www.oracle.com/technology/obe/obe1013jdev/10131/devdepandmanagingws/devdepandmanagingws.htm demonstrates creating a web service from a plain java class. I'm wondering:
- Is it possible to create a web service from a stateless session bean instead of a java class? If so, what's the proper way to do this in JDeveloper? When I tried doing so in JDeveloper 10.1.3.0.4 (SU5) using the J2EE Web Service wizard, the wizard did not list the session bean in the Component To Publish dropdown (it does list any java classes available in the project). I can proceed by manually typing in the name of the session bean. After the wizard completes though, the @Stateless annotation that had been in my session bean class code is removed and replaced by a @WebService annotation. The end result is that it looks like it made no difference whether I had tried to create the web service from a session bean or plain java class as the annotations in the resulting web service code are the same (although if I had started from a session bean, the class for the web service still implements the Local/Remote EJB interface that the session bean originally implemented).
- Assuming it's possible to create a web service from a stateless session bean, is there any advantage/disadvantage creating a web service from a java class vs a stateless session bean? I'm creating the web service from scratch so I also need to either build the java class or stateless session bean the web service would be based on from scratch too.
Thanks for any ideas about this.Hi,
EJB Session beans (EJB 3.0) are deployed as WebServices by annotating the class with @WebService and the methds with @WebMethod (both tags require you to add the JSR-181 library to your project (available in the JDeveloper list of libraries)). Unlike the J2E WebService, the EJB session bean service is turned into a WebService upon deployment. This means you obtain teh WSDL file after deployment
- Assuming it's possible to create a web service from a stateless session bean, is there any advantage/disadvantage creating a web service from a java class vs a stateless session bean?
The difference is that EJB Session bean based web services are integrated with the J2EE container, which means that they can leverage container services like transaction handling, data sources, security, JMS etc.
Frank -
StreamCorruptedException from Stateless Session bean to java class
Hi all,
We have 2 servers, a ColdFusion App server which contains suns jdk 1.4.2 and websphere appserver using Ibm jdk, 1.4.2. On Server 1, we have a standalone java class which does a stateless session bean lookup and requests a service from it. On server 2(websphere), we have a stateless session bean deployed which connects to a database using a jndi lookup, executes a query and returns back a CachedRowSet object (which populates the ResultSet from the above query.) In some cases, session bean returns back an array of objects or String objects or just plain int values.
When the java class on server 1 invokes the methods returning CachedRowSet, we are getting a StreamCorruptedException, whereas on the server side, there is no exception. everything gets executed fine on websphere. This is the case only for CachedRowSet and not for other return types(as mentioned earlier the session bean returns an array of object in some cases which the java class on server 1 is successfully able to use).
This is what the piece of code look like on server 1:
// First gets a StatelessSessionBean using suns InitialContextFactory
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL,"iiop://localhost:2809");
System.out.println("Creating initial context");
Context ctx = new InitialContext(env);
System.out.println("Initial context created.");
Object homeObj = ctx.lookup("cell/nodes/localhost/servers/server1/ejb/SSBHome");
SSBHome eHome = (SSBHome)PortableRemoteObject.narrow(homeObj,SSBHome.class);
System.out.println("Got Home");
SSB eBean = eHome.create();
CachedRowSet crs = eBean.getAccts(param1, param2);
//This is the line of code which throws the exception.
The stacktrace shoows as follows:
Got Home
java.io.StreamCorruptedException
at com.sun.corba.se.internal.io.IIOPInputStream.inputRemoteMembersForReadFields(IIOPInputStream.java:1675)
at com.sun.corba.se.internal.io.IIOPInputStream.readFields(IIOPInputStream.java:1595)
at com.sun.corba.se.internal.io.InputStreamHook.readFields(InputStreamHook.java:177)
at java.math.BigInteger.readObject(BigInteger.java:3034)
at com.sun.corba.se.internal.io.IIOPInputStream.readObject(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.invokeObjectReader(IIOPInputStream.java:1298)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:908)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1484)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1893)
at com.sun.corba.se.internal.io.IIOPInputStream.defaultReadObjectDelegate(IIOPInputStream.java:424)
at com.sun.corba.se.internal.io.InputStreamHook.defaultReadObject(InputStreamHook.java:163)
at java.math.BigDecimal.readObject(BigDecimal.java:1084)
at com.sun.corba.se.internal.io.IIOPInputStream.readObject(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.invokeObjectReader(IIOPInputStream.java:1298)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectUsingFVD(IIOPInputStream.java:1182)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:259)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.EJBProj._SSB_Stub.getAccts(_SSB_Stub.java:240)
at com.test.Test1.getAccts(Test1.java:101)
at com.test.Test1.<init>(Test1.java:65)
at com.test.Test1.main(Test1.java:81)
java.io.IOException: Unable to read value from underlying bridge : Serializable readObject method failed internally
at com.sun.corba.se.internal.io.IIOPInputStream.throwExceptionType(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.defaultReadObjectDelegate(IIOPInputStream.java:446)
at com.sun.corba.se.internal.io.InputStreamHook.defaultReadObject(InputStreamHook.java:163)
at java.math.BigDecimal.readObject(BigDecimal.java:1084)
at com.sun.corba.se.internal.io.IIOPInputStream.readObject(Native Method)
at com.sun.corba.se.internal.io.IIOPInputStream.invokeObjectReader(IIOPInputStream.java:1298)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectUsingFVD(IIOPInputStream.java:1182)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:259)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:948)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:289)
at com.sun.corba.se.internal.corba.TCUtility.unmarshalIn(TCUtility.java:266)
at com.sun.corba.se.internal.corba.AnyImpl.read_value(AnyImpl.java:561)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_any(CDRInputStream_1_0.java:635)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_any(CDRInputStream.java:260)
at com.sun.corba.se.internal.javax.rmi.CORBA.Util.readAny(Util.java:100)
at javax.rmi.CORBA.Util.readAny(Util.java:90)
at com.sun.corba.se.internal.io.ValueHandlerImpl.read_Array(ValueHandlerImpl.java:586)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:244)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:1577)
at com.sun.corba.se.internal.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:1796)
at com.sun.corba.se.internal.io.IIOPInputStream.inputObject(IIOPInputStream.java:913)
at com.sun.corba.se.internal.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:261)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:247)
at com.sun.corba.se.internal.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:209)
at com.sun.corba.se.internal.iiop.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1084)
at com.sun.corba.se.internal.iiop.CDRInputStream.read_value(CDRInputStream.java:293)
at com.EJBProj._SSB_Stub.getAccts(_SSB_Stub.java:240)
at com.test.Test1.getAccts(Test1.java:101)
at com.test.Test1.<init>(Test1.java:65)
at com.test.Test1.main(Test1.java:81)
Again, everything seems to work fine on websphere server.
Any Clue of why this is happening?
All suggestions are greatly appreciated.
Thanks
Neorav
Message was edited by:
NeoravBSorry for the confusion!
The solution mentioned above is not the right solution.
The above given code works fine irrespective of having corbaloc in the url, if you are working in the IBMs jvm.
It fails if you are working in suns jvm.
Anyone with any idea whats missing here.
Thanks a lot for any suggestion/ideas
Neorav -
Bean works slow than a Java class
Hi,
I am trying to zip a file using beans that gets the parameters from jsp. I tried the same block of code as a Plain java class it does the zip action very fast but the same code when executed with bean does the zip action very slow, can some body tell what would be the problem.
thanks.With other words, the network speed/bandwidth is the bottleneck.
A decent HDD can reach 70MB/s. A 10Mbit network won't go any faster than 10MB/s. Upgrade to 100Mbit, 1Gbit or optic fiber. -
Call Bean from normal java class
Dear Friends,
Is it ok to call an entity bean or session bean frm normal Java class.
(Java class is in the same application as the beans).
Is there a special way to lookup the beans from normal java classes.
Thanking You,
Chamal.it is ok and very commonly done.
Note that the simple java program must be running in the same local network. You cannot have the java program and EJBs distributed over internet. (I m not certain of it, but mostly I shoudl be correct. If you have the resources, try it out and let me know)
In most of the cases, EJBs are called by
1. A servlet
2. Another EJB
3. a simple java program.
In the first 2 cases, you can go for Local Interfaces (more so in the second case than the first). The reason being that the the client and server will be in the same JVM (typically the Application server). Thus, in the first case, if the Web container and the ejb container are in the same app server, EJBs can be local.
However, in the third case, it is unlikey that you will have the client runnng and the same jvm as the server, because the app server has its own jvm.
sample code (this method is being called from the main method of a simple java program. it is self explanatory):
public void processRequestForSessionBean()
System.out.println("REQUEST RECEIVED");
try
Hashtable nameHashtable = new Hashtable();
nameHashtable.put( Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory" );
nameHashtable.put( Context.PROVIDER_URL, "t3://localhost:7001" );
InitialContext context = new InitialContext(nameHashtable);
System.out.println("created initial context");
Object lookupObject = context.lookup("CustomerBean");
System.out.println("Got the lookup object");
CustomerDataHome home = (CustomerDataHome) PortableRemoteObject.narrow(lookupObject,
Class.forName("com.shiv.business.CustomerDataHome"));
System.out.println("Home interface");
customerData = home.create();
System.out.println("Remote Interface");
addDataToSB(customerData);
ArrayList namesList = customerData.getNames();
System.out.println(namesList.toString());
//customerData.remove();
catch (Exception exception)
System.out.println("FATAL ERRORS");
exception.printStackTrace();
} -
Accessing managed-beans property from simple java class
I have managed bean that is registered in faces-config.xml:
<managed-bean>
<managed-bean-name>documentReportsBean</managed-bean-name>
<managed-bean-class>[myApp].beans.DocumentReportsBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
I want to access property of documentReportsBean from other java class without registering managed-property in faces-config. How can I do that?Thank you, what I needed was someone saying the right word. "ValueBinding" in this case.. :)
Two lines:
ValueBinding vb = FacesContext.getCurrentInstance().getApplication().createValueBinding("#{documentReportsBean}");
DocumentReportsBean pbean = (DocumentReportsBean) vb.getValue(FacesContext.getCurrentInstance());
gives my full control. Nice -
How to get properties of a bean from another java class
Hi,
I am new to JSF. Currently I am facing a problem, and hope you experts can give me some guidance.
The JSF app i am working on has one Java class for handling a tree structure, MyTreeNode.java, and it also has a bean, NameBean.java, which has two properties, username and password.
I can easily associate an input text with the #{name.username} to store the user's login... but later on, I need to fetch that information inside of MyTreeNode.java. How do I do that? Thanks!
-- Jim<managed-bean>
<managed-bean-name>Person</managed-bean-name>
<managed-bean-class>demo.PersonBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-property>
<property-name>bank</property-name>
<property-class>demo.BankBean</property-class>
<value>#{bank}</value>
</managed-property>
<managed-bean>
<managed-bean>
<managed-bean-name>bank</managed-bean-name>
<managed-bean-class>demo.BankBean</managed-bean-class>
<managed-bean-scope>session</managed-bean-scope>
<managed-bean>this version doesnt work for me.
does the single beans have to look any special?
some demo code out there?
thx! -
Changing Java class into Java Bean
Can anybody tell me how to change a Java class into simple Java Bean.I dont need any visual interface of Java Bean.I simply want to turn my Java class into Java Bean.
You can use almost any class as a java bean.
To be a bean it must
1 - Have a constructor which takes no arguments (so it can be instantiated)
2 - For properties/attributes which you want to have readable/writable, provide get / set methods of the appropriate type.
Thats it. -
Changing Java class in to Java Bean
Can somebody tell me how to change a normal Java class into Java Bean.I dont need any visual interface in Java Bean.I simple need to turn my Java class into Java Bean.
Hi,
Chanchal,
you didn't specify anything abt ur java class. In a java bean basically you use getter and setter methods to call. import relevant packages and extend them into your class. If u give sufficient info, then i can help you out.
Durga -
How can i display the result of java class in InputText ?
Hi all,
How can i get the result of java class to InputText Or OutputText ???
also can every one in the forum give me road map for dealing with java in oracle adf because i'm beginner in oracle adf
i saw some samples in oracle adf corner but it's difficult for me.User,
Always mention your JDev version, technologies used and clear usecase description (read through this announcement : https://forums.oracle.com/forums/ann.jspa?annID=56)
How can i get the result of java class to InputText Or OutputText ???Can you elaborate on your requirement? Do you mean the return value of a method in a class as output text? Or an attribute in your class (bean?) as text field?
-Arun -
How to implement a java class in my form .
Hi All ,
I'm trying to create a Button or a Bean Area Item and Implement a class to it on the ( IMPLEMENTATION CLASS ) property such as ( oracle.forms.demos.RoundedButton ) class . but it doesn't work ... please tell me how to implement such a class to my button .
Thanx a lot for your help.
AIN
nullhi [email protected]
tell me my friend .. how can i extend
the standard Forms button in Java ? ... what is the tool for that ... can you explain more please .. or can you give me a full example ... i don't have any expereience on that .. i'm waiting for your reply .
Thanx a lot for your cooperation .
Ali
<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by [email protected]:
Henrik, the Java importer lets you call Java classes on the app server side - I think what Ali is trying to do is integrate on the client side.
If you want to add your own button then if you extend the standard Forms button in Java and then use this class name in the implementation class property then the Java for your button will be used instead of the standard Forms button. And since it has extended the basic Forms button it has all the standard button functionality.
There is a white paper on OTN about this and we have created a new white paper which will be out in a couple of months (I think).
Regards
Grant Ronald<HR></BLOCKQUOTE>
null -
How to access variables declared in java class file from jsp
i have a java package which reads values from property file. i have imported the package.classname in jsp file and also i have created an object for the class file like
classname object=new classname();
now iam able to access only the methods defined in the class but not the variables. i have defined connection properties in class file.
in jsp i need to use
statement=con.createstatement(); but it shows variable not declared.
con is declared in java class file.
how to access the variables?
thankshere is the code
* testbean.java
* Created on October 31, 2006, 12:14 PM
package property;
import java.beans.*;
import java.io.Serializable;
public class testbean extends Object implements Serializable {
public String sampleProperty="test2";
public String getSampleProperty() {
return sampleProperty;
}jsp file
<%@ page contentType="text/html;charset=windows-1252"%>
<%@ page import="java.sql.*,java.util.*"%>
<html>
<head>
<title>Schedule Details</title>
</head>
<jsp:useBean id="ConProp" class="property.testbean"/>
<body>
Messge is : <jsp:getProperty name="msg" property="sampleProperty"/>
<%
out.println(ConProp.sampleProperty);
%>
</body>
</html>out.println(ConProp.sampleProperty) prints null value.
is this the right procedure to access bean variables
thanks -
Aloha all-
I'm familar with using LiveCycle Data Services with Flex and love its use of front-end ActionScript classes that map back to the server. I was wondering if such functionality was possible with Java classes? My guess is no, but wanted to make sure as I've been going through the docs and haven't found anything explicit.
Basically, I'm thinking about using LiveCycle DS in an all Java project (Swing front end) and if it communication could be handled by DS, which I'm familiar with, instead of creating my own JMS topics, that'd be great. Plus it provides a way to move the app from Java/Swing to Flex/Air.
RonHi Ron,
We don't currently provide a client-side Java API for LC DS.
If you plan on switching from Swing to Flex/Air in the future, the major thing to watch out for is that the classes you ship over the wire from the server to the client adhere to the Java bean serialization rules that Flash AMF serialization requires (no-arg constructor, public get/set methods for properties, etc.). But you should be able to expose the same server code to a Flex/Air client with minimal to no impact.
Porting your front-end app from Swing to Flex/Air wouldn't offer any opportunities for client-side code reuse.
Best,
Seth
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