Using bc4j with applets

Hi,
I was wondering if you have any tips on using bc4j in applets. The 2 biggest problems I'm having is the jar size of the applet after all libs are included
(4MB+) and the fact that I can't use XDK, JNDI, BC4J and some other libs from applets unless I sign them or change the policy file at each client using the applets.
I really think all the calls to System.getProperties(), etc. should be placed inside try catch blocks to catch the security exceptions raised by xdk, RMIInitialContextFactory, etc. and handled using
defaults for properties... it'd be even better if these properties could be set in another way as well.
Thanks in advance,
Leonardo Bueno

FYI... my environment is:
Oracle9iAS (9.0.3.0.0)
JDeveloper (9.0.3.4)

Similar Messages

How to use BC4J with JDeveloper 9i in a Team

Hello
I'm not sure if I'm to stupid, but to say the truth I didn't found the clue how to share a BC4J Application between several develeopers. Maybe someone can give me a hint.
That's my situation:
Our team is going to develop a web application using BC4J and BC4J-JSP, nothing special I think.
But my problem is, that BC4J and especially the wizards refer to a lot of different files. Even simple changes often result in multiple files being changed in different parts of the project.
Creating a view link between view objects in two packages for example changes the view objects in both packages. Also the project (.jpr) file or several "BC4J.xcfg" files are changed very often.
So it is not easy to find parts of code from which I can say they are owned by one developer and others which are owned by another. Most often, if you have to merge the work of different developers, you have to edit the BC4J-XML-Files using an external editor. Or did someone find a better way? Please tell me!
So, what is the best way to share code between developers?
Should I partition the application by packages?
- advantage:
it allows a fine partitioning
- disadvantages:
it has the great danger that BC4J makes changes in other packages which will be overseen when merging.
Should I create a projects for each developer and distribute code between the projects using libraries?
- advantage: no unseen changes will happen, as the libraries are readonly.
- disadvantages: no view links between view objects in different projects (Libraries) are possible! Also a lot of "load errors" can occure when updating a library, which have to be manually corrected in the dependent projects.
Are source code management systems a real help in this problem or do they just "manage" the problem? I already tried SCM and PVCS but was not very happy with the way of working. As JDeveloper is not "really easy" to use with theese tools.
So I would like to get any hints how other developers are dealing with this problem. Are you using BC4J with JDeveloper 9i in a team? Please tell me how do it and how you have partitioned your application.
Thanks in advance
Frank Brandstetter

Hi,
I'm not sure whether my answer is good enough for you, but it might help.
First of all, you have to use JDev 9.0.3, because 9.0.2 has big problems with associations/view links between objects in different projects.
Creating a view link between view objects in two packages for example changes the view objects in both packages. Also the project (.jpr) file or several "BC4J.xcfg" files are changed very often.This is not completely true in 9.0.3, as you may choose not to create an accessor in the imported object (and usually you don't need it neither!). As for bc4j.xcfg, there is a trick: define a "standard" database connection name to use all over your project! This will prevent modifying these files all the time!
Should I create a projects for each developer and distribute code between the projects using libraries?
- advantage: no unseen changes will happen, as the libraries are readonly.
- disadvantages: no view links between view objects in different projects (Libraries) are possible! Also a lot of "load errors" can occure when updating a library, which have to be manually corrected in the dependent projects.I would say, projects for each application component, which by chance will be managed by a single developer at a time.
As for the disadvantages, in 9.0.3 you are able to properly create associations and links using read-only objects. Hopefully, the release version will solve some generation inconsistencies...
Concerning the errors that occur when modifying a library, this might be balanced by the relative independence of the components... If you are able to develop following the dependency tree, you will not meet the problem very often.
Are source code management systems a real help in this problem or do they just "manage" the problem? I already tried SCM and PVCS but was not very happy with the way of working. As JDeveloper is not "really easy" to use with theese tools.Indeed, I do not have a SCMS really able to manage merges in the BC4J XML files... We rather try not to arrive there!
So I would like to get any hints how other developers are dealing with this problem. Are you using BC4J with JDeveloper 9i in a team? Please tell me how do it and how you have partitioned your application.I really hope that my hints will help.
Regards,
Adrian

HOWTO: Use BC4J With or Without DB Triggers

This HowTo describes how to use BC4J, database sequences and triggers
and what are the ramifications.
INTRODUCTION
BC4J has the ability to work with database sequences in order to obtain a
unique value when inserting records. BC4J also has the ability to
work either with a 'before insert' trigger which automatically creates
a new unique value for the primary key or without a trigger. When not using
a database trigger, BC4J also has the ability to obtain the sequence value
and set the primary key value.
Before discussing the ramifications of using one approach or the other, let's
show examples of how to use both approaches:
BC4J & sequences WITH a database trigger
and
BC4J & sequences WITHOUT a database trigger
HOWTO DEMONSTRATION STEPS
To illustrate both scenarios a simple database setup script is provided which
creates two tables:
CUSTOMER_NT which DOES NOT have a before insert trigger and
CUSTOMER_WT which DOES have a trigger.
Database Install Script:
<code>
drop trigger customer_insert_trigger;
drop table customer_wt;
drop table customer_nt;
drop sequence customer_wt_seq;
drop sequence customer_nt_seq;
create sequence customer_wt_seq start with 1;
create sequence customer_nt_seq start with 101;
create table customer_wt(
id number,
name varchar2(30),
constraint
customer_wt_pk
primary key (id)
create table customer_nt(
id number,
name varchar2(30),
constraint
customer_nt_pk
primary key (id)
prompt Inserting data...
insert into customer_wt (id, name)
values (customer_wt_seq.nextval, 'Mickey');
insert into customer_wt (id, name)
values (customer_wt_seq.nextval, 'Goofy');
insert into customer_nt (id, name)
values (customer_nt_seq.nextval, 'Daffy');
insert into customer_nt (id, name)
values (customer_nt_seq.nextval, 'Porky');
commit
prompt Creating trigger
create trigger customer_insert_trigger
before insert on customer_wt for each row
begin
select customer_wt_seq.nextval into :new.id from dual ;
end;
</code>
The next step is to create the DEFAULT Entity Objects and View Objects using
the Business Components Wizard.
USING BC4J WITH A DATABASE TRIGGER
Let's modify the entity object CustomerWt so it can use the database trigger.
Edit the entity object CustomerWt by right-clicking in the navigator.
Click on the 'Attribute Settings' tab and edit the ID attribute.
- Uncheck 'Mandatory'checkbox. This allows you to insert without a value for the primary key
- Check 'Refresh after Insert'. This obtains the value from the database generated by the trigger.
- Check 'Updateable While New'. Id is only updateable when inserting.
Click finish to complete the wizard. Save all and recompile the project.
Now let's test our work.
In the navigator right-click the application module and select 'Test..'. This will launch
BC4J's built in tester. Connect to the application.
In the tester double-click the CustomerWtView view object to run a test edit form.
After the edit form renders, navigate through the existing records using the navigate
buttons on the edit form. Now let's insert a record to execute the trigger.
click on the '+' button to insert a record. Enter a value in the 'Name' field and commit the change.
Observe that a new value has automatically been inserted into the Id field.
That's it! You have successfully used BC4J and a database trigger.
Now let's try it without a trigger..
USING BC4J WITHOUT A DATABASE TRIGGER
Now edit the entity object CustomerNT so it doesn't need a database trigger.
Similar to before, edit the entity object CustomerNt by right-clicking in the navigator.
Click on the 'Attribute Settings' tab and edit the ID attribute.
- Uncheck 'Mandatory'checkbox.
- Check 'Updateable While New'.
An additional step is also required. The Create method will have to be modified to extract
the value of the sequence.
In the Edit EntityObject Wizard click the Java tab and select Create method and click Finish.
The create method is generated in your Java fil e. In the Workspace view of the Navigator,
expand the CustomerNt entity object in the navigator. Double-click
CustomerNtImpl.java to open it in the Source Editor. In the Structure pane, double-click
create(AttributeList). Modify the Create method so it looks like this:
<code>
public void create(AttributeList attributeList) {
super.create(attributeList);
SequenceImpl s = new SequenceImpl("customer_nt_seq", getDBTransaction());
Integer next = (Integer)s.getData();
setId(new Number(next.intValue())); }
</code>
Save and compile the project.
Now test the ViewObject CustomerNtView using the tester as before.
In the edit form of CustomerNTView click on the '+' to insert a record. Observe that
just as before a new value has automatically been inserted in the ID field!
TO USE A DB TRIGGER OR NOT TO USE A DB TRIGGER.
Using a Database trigger sometimes preferable if you have non BC4J applications
also sharing the database. In this case it is still safest to just let the database
update it's own primary keys.
If you don't have any other non-BC4J applications sharing the database, then not using
a database trigger is perfectly acceptable and can have slightly better performance.
The important thing to remember is that the option is yours to use either approach!
null

Thank you for the reply Jonathon. I am using a ViewObject which
consist of several tables. I haven't tried the DB trigger
approach but just using the BC4 approach in overriding the
create method.
Here is the parent class create as a part of the
FasNameImpl.java file which does the job correctly.
public void create(AttributeList attributeList) {
super.create(attributeList);
SequenceImpl l_seq = new SequenceImpl
("SEQ_CUSTOMER_ID",getDBTransaction());
Integer l_next = (Integer)l_seq.getData();
setCustomerId(new Number(l_next.intValue()));
This is when I triedpassing the value to the child table. But I
can't figure it out. I think the link is working fine if I had a
ViewLink deployed but it doesn't look like it's doing the job
for ViewObject.
I am trying to call the childclass.method
(FasCustomer.setCustomerId(l_next);
But I am getting error.
Thanks a lot for your suggestions,
Kamran
703 696 1121

Using javaagents with applets

Is it possible to use javaagents with applets?
If it is, how?

FYI... my environment is:
Oracle9iAS (9.0.3.0.0)
JDeveloper (9.0.3.4)

Using BC4J with MS Access/MySQL

Hi,
I have to develop a small application for PC consisting of somes input forms and a data report (for screen & printer). I'm new to the BC4J framework and I don't have any experiencie with it.
I will work with one of this DB: MS Access or MySQL (SQL 92 compliant).
Before beginning my work I would want to know if somebody has any experience on using the framework with one of these databases. If so, does the framework work well with these databases? Is there some known problem or limitation? Has anybody some remendation on this matter?
Thank you so much.
M Laura.

Although we don't formally test with MySQL,
we have an inhouse project that uses
BC4J with MySQL - it works well.
The only way into Access is via the JDBC:ODBC bridge,
which I've always found troublesome.
regards, Karl McHorton (bc4j development)

Using JMF with applet

Hello,
I've got an applet that consumes a lot of CPU. I'm studying to migrate this applet to a pda, but it's not enough cpu for it. I'm reading JMF docs and I decide to generate a movie with the output of an applet. �If it's possible? My idea is to create the movie on the server. I can modify my applet to avoid the use of the applet inheritance and then render the output to an standard movie format. After I will send the movie to the browser
You can see the applet here. Click on View route 3D under the flash movie.
http://www.tmb.net/vullanar/en_US/resultatcerca.jsp?tipusrepre=0&origenx=31514.420&origeny=82758.000&descripcioorigen=L1+-ARCDE+TRIOMF&destix=34704.550&destiy=87378.460&descripciodesti=L2+-ARTIGUES-SANTADRI%C0&tipustransport=0&numtransbords=2&tempscaminant=20&velocitatcaminant=1&tipushora=1&dia=27&mes=05&hora=12&minut=22&idioma=en_US&operador=TMB&poblacioorigen=1&poblaciodesti=1
Thanks in advance,
David B.

passionforjava2 wrote:
...I have issues with applet unable to transmit voice using JMF. i know it is a security issue. As the error on the console says
java.lang.RuntimeException: No permission to capture from applets
Error : Couldn't create DataSourceWhen JMF is installed, it generally offers a checkbox to allow or deny 'capture in applet'. By default it is not checked, and if the user goes with that recommendation, I am not sure that anything will overrule that.
In a folder iPhone/myphone/What is the URL where we can visit this applet?
.. i have applet embedded html file along with .jar files with required classed and applet signed. Are you prompted to trust the digitally signed code? You can see the dialog I mean by visiting the applet linked from [http://pscode.org/test/docload/].
..Along with that .jar i do have jmf.jar and java.policy.applet file and jmf.properties file . Forget the policy files, they are a waste of time, and completely impractical for end users.

JSP using BC4J with MS SQL Server

I use JDevelop to develop my JSP apps with BC4J. When I Run a JSP app, the error happened.
The error message is [Microsoft][SQLServer 2000 Driver for JDBC]Can't start a cloned connection while in manual transaction mode.
Who can tell me what the error message means? Or What error might happened to my code?
What parameter I should setup? Or What code I should change?

There is a "how to" that addresses this issue
with SQL*Server:
http://otn.oracle.com/products/jdev/howtos/bc4j/bc_psqlserverwalkthrough.html
You need to qualify your jdbc URL: (this is from the howto)
On the Connection page, enter the Java class name and the URL.
Java class name: com.microsoft.jdbc.sqlserver.SQLServerDriver
URL: jdbc:microsoft:sqlserver://<db-host>:1433;SelectMethod=cursor
Note: There's a semicolon before SelectMethod=cursor.
Note on Select Method: From the MS SQL Server documentation: SelectMethod={cursor | direct} determines whether or not Microsoft SQL Server "server cursors" are used for SQL queries. Setting SelectMethod to direct allows SQL statements to be executed without incurring server-side overhead for managing a database cursor over the SQL statement. Direct mode is the most efficient for executing Select statements; however, applications are limited to a single active statement while executing inside a transaction. If multiple result sets are required from a single query execution, then the application must set SelectMethod to direct.
regards, Karl

How to use dll with applet?

I want to use a dll with a applet.
I try several solutions : signed applet, dll in jar, ... But without any result.

U can use it if u sign the applet. It is a bit trick way though.
Create an inputstream, read and copy the dll to some where path is defined (System dir for ex) from jar. Then load that library.. But u need a dummy class for that before starting applet. Rest is ur brain.. Best of luck. I tried and succeded.

Using t3s with applets

Hi -
We have a few applets accessing EJB's on WebLogic 5.1 (SP 6) which utilize
"t3" as the protocol and don't have any problem getting Contexts and issuing
requests. However, once we switch to t3s, we get an error indicating that
the server can't be found at t3s://myserver:443. This is not a firewall
problem (we've tested it with no firewall in place), nor does it appear to
be a certificate problem (WL server is running in 128-bit mode with a valid
cert, etc.) Does anyone have any experience running applets and WL,
particularly over t3s? I've included a stack trace below. Thanks in
advance -
Andy
[email protected]
=========================
javax.naming.CommunicationException. Root exception is
java.net.ConnectException: No server found at T3S://myserver:443
at weblogic.rjvm.RJVMFinder.findOrCreate(RJVMFinder.java:161)
at weblogic.rjvm.ServerURL.findOrCreateRJVM(ServerURL.java:200)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:195)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:148)
at
weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFact
ory.java:123)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
[applet call stack goes here]
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

FYI, I believe we have a legitimate fix, but we're still waiting for an
official stance from WL. The "fix" we've implemented includes the previously
mentioned workaround, plus the layering of SP8 weblogic.security package on
top of SP6.
Andy
"Andrew King" <[email protected]> wrote in message
news:[email protected]...
Hi -
It appears there's a bug with WL's RSA classes in SP6 (RSAKey, RSApkcs1),
128-bit vesion. We've hacked a couple of fixes which appear to work, butI'm
wondering if anyone else can confirm this. Thanks -
Andy
"Andrew King" <[email protected]> wrote in message
news:[email protected]...
Hi -
We have a few applets accessing EJB's on WebLogic 5.1 (SP 6) which
utilize
"t3" as the protocol and don't have any problem getting Contexts andissuing
requests. However, once we switch to t3s, we get an error indicating
that
the server can't be found at t3s://myserver:443. This is not a firewall
problem (we've tested it with no firewall in place), nor does it appearto
be a certificate problem (WL server is running in 128-bit mode with avalid
cert, etc.) Does anyone have any experience running applets and WL,
particularly over t3s? I've included a stack trace below. Thanks in
advance -
Andy
[email protected]
=========================
javax.naming.CommunicationException. Root exception is
java.net.ConnectException: No server found at T3S://myserver:443
at weblogic.rjvm.RJVMFinder.findOrCreate(RJVMFinder.java:161)
at weblogic.rjvm.ServerURL.findOrCreateRJVM(ServerURL.java:200)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:195)
at
weblogic.jndi.WLInitialContextFactoryDelegate.getInitialContext(WLInitialCon
textFactoryDelegate.java:148)
at
weblogic.jndi.WLInitialContextFactory.getInitialContext(WLInitialContextFact
ory.java:123)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
[applet call stack goes here]
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Using MVC with Applet inside Servlet

Hello fellow Java developers,
I want to implement the Model View Controller concept inside a Bean Applet combination running in a servlet environment.
When my model (the Bean) changes, I want my Applet (the View) to get notified so it can get the update from the Bean. The Applet is incorporated inside the jsp page (e.g. the servlet). The Bean is known inside the jsp. How do I make that same Bean known inside the Applet?
When I create a new Bean during init, or in the constructor of the Applet, I get a complete other reference than the Bean inside the jsp. So, when I ask information from the Bean, I often get NullPointerExceptions, because I am referencing the wrong Bean.
Does anyone have a solution for my problem?
Regards,
Michel

hi,
a servlet is server side object, an applet is client side object.
For the communication, you should try HttpUrlConnection from applet to servlet.
another way is tu use ejb, or rmi communcation

Using sockets with Applet

Hey,
I have a website which has an applet on one of the pages. I put in code that uses a socket to connect to MY computer. ( i want to use my computer as a server which stores data/accounts/etc) A SecurityException was thrown when I tested the applet. Is what I'm trying to do possible? or does something like this have to connect to a server which is on my website?
Thanks

I believe you can run something like this by signing the applet.
And then the user has the option of allowing or disallowing a signed applet to do that kind of thing. I don't know which is the default.

Problem using SAAJ with Applets

This method to do a SOAP connection call does not work within a Applet -- but it works fine otherwise.
Any help would be appreciated.
Thanks.
public void execute() {
     try {
         SOAPConnectionFactory
          soapConnectionFactory     = SOAPConnectionFactory.newInstance();
         connection               = soapConnectionFactory.createConnection();
         response     = connection.call(request, endpoint);
         connection.close();
     } catch (Exception ex) {
         ex.printStackTrace();
    } Trace follows:
Jun 8, 2006 8:22:12 PM com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection post
SEVERE: SAAJ0009: Message send failed
com.sun.xml.messaging.saaj.SOAPExceptionImpl: java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:127)
     at imt.util.SOAPTrans.execute(SOAPTrans.java:52)
     at test.util.applet_soap.init(applet_soap.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:121)
     ... 4 more
Caused by: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:325)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:150)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission setFactory)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkSetFactory(Unknown Source)
     at java.net.HttpURLConnection.setFollowRedirects(Unknown Source)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:239)
     ... 7 more
CAUSE:
java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:121)
     at imt.util.SOAPTrans.execute(SOAPTrans.java:52)
     at test.util.applet_soap.init(applet_soap.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:325)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:150)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission setFactory)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkSetFactory(Unknown Source)
     at java.net.HttpURLConnection.setFollowRedirects(Unknown Source)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:239)
     ... 7 more
CAUSE:
java.security.PrivilegedActionException: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.call(HttpSOAPConnection.java:121)
     at imt.util.SOAPTrans.execute(SOAPTrans.java:52)
     at test.util.applet_soap.init(applet_soap.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.xml.messaging.saaj.SOAPExceptionImpl: Message send failed
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:325)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection$PriviledgedPost.run(HttpSOAPConnection.java:150)
     ... 6 more
Caused by: java.security.AccessControlException: access denied (java.lang.RuntimePermission setFactory)
     at java.security.AccessControlContext.checkPermission(Unknown Source)
     at java.security.AccessController.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkPermission(Unknown Source)
     at java.lang.SecurityManager.checkSetFactory(Unknown Source)
     at java.net.HttpURLConnection.setFollowRedirects(Unknown Source)
     at com.sun.xml.messaging.saaj.client.p2p.HttpSOAPConnection.post(HttpSOAPConnection.java:239)
     ... 7 more
java.lang.NullPointerException
     at imt.util.SOAPTrans.getXMLResponse(SOAPTrans.java:37)
     at test.util.applet_soap.init(applet_soap.java:56)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)

Solved my own problem.
I was erroneously not signing one of my jar files.
cheers.

BC4J with Struts using EditAction's create method.

Hi,
I am using BC4J with struts and using the EditAction and UpdateAction classes provided by BC4J.
When i want to create a new row in the database the documentation asks me to call EditAction's create() method and then UpdateAction's execute() method to do it. But even when i just call UpdateAction's execute() method I am able to create a new row. So WHY should I call EditAction's create() method ?????

EditAction's create() method is something you would call in the action before rendering the empty form for the user to fill in.
It creates a row, and then marks the row as having STATUS_INITIALIZED using the Row.setNewRowState(Row.STATUS_INITIALIZED) call.
By setting the row to STATUS_INITIALIZED, this makes BC4J "forget" that it's a new row that needs to be inserted. In effect, it makes that new row a throwaway row used only for the purpose of rendering the blank form. An important reason you would want to do things this way is to pickup entity-level default values in the attributes of the new row.
For example, in the toy store demo, why is it that when you register as a new user the "Country" poplist defaults to "United States" ? (it's not the first entry in the list).
The answer is that, since the EditAction (or in this case my custom subclass of that) creates the blank row, the fact that the "toystore.model.businessobjects.Account" entity object declares that its Country attribute has a default value of "US" makes the blank row created in the "toystore.model.dataaccess.Accounts" view object have a default value of "US", and that default value in the blank row causes the <jbo:InputSelect> tag that renders the poplist to mark the corresponding "United States" option in the list as currently selected (as it's the display string associated in the poplist with the value "US").

Using BC4J Components with different App Servers

Can we use BC4J with 3rd party Application Servers (WebSphere, Weblogic, iPlanet etc)?
If so any advantages (Performance, Implementation, installation) in using these components with Oracle iAS?
Thanks
null

BC4J allows different ways of deploying your application.
1) Local Mode : where your client application and BC4J application are colocated togther and running in the same VM
2) As a EJB session bean
3) As a corba server object.
Using the Local mode deployment option you can deploy the BC4J application to any appservers (weblogic, websphere, iplanet) as long as they have standard VM and if your client application is JSP or Servlet then the appservers need a JSP or Servlet engine.
In JDeveloper 3.1 you can deploy BC4J applicaiton as EJB session bean to Oracle8i
In JDeveloper 3.2 ( which will released in next few weeks) you can deploy BC4J application as EJB session bean to Oracle8i , Oracle iAS and weblogic .
iAS comes preconfigured with BC4J runtime by default
raghu

BC4J with Jdeveloper 10.1.3.1.0

Hi,
I am new to jdeveloper. Can I use BC4J with this version ? I am looking for some sample code where it shows how to call my own Packages from a from and how to control my own transaction. Can anyone point me to some good samples ?
Thanks
Naresh

ADF BC in 10.1.3 is the newest version of BC4J.
You can find a complete developer guide for working with ADF BC as well as a tutorial here:
http://www.oracle.com/technology/products/adf/learnadf.html
(the left side of the page).

Using bc4j with applets

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