Exporting methods that throw exceptions?

Using 10g Preview, I have encountered the following situation:
I've written a custom method in my ViewRowImpl class that I intend to export as a client row method. It's a public void method that takes a single String parameter.
Originally, I declared that the method throws Exception. With the throws clause present, the View Object wizard does not display the method in the list of available methods to export to the client. Removing the throws clause causes the method to appear in the list.
There's nothing in the documentation that I can find to explain this apparent restriction. The closest thing I can find has to do with all types in the signature being Serializable. Nothing is mentioned about exceptions.
Can somebody explain why methods that declare thrown exceptions can't be exported to the client? Or does the type of exception declared need to be narrower, such as a JboException?

I wondered the same thing. Take a look at this thread:
Why can't I throw exception from the Impl?

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How does it work : String MethdName (argument) throws Exception {}

HI,
I am very new to Java. I was looking through some code written by some other developer.
the code looks like
String MethdName (argument) throws Exception {
// some code here
What it exactly means? Are we forcing this method to always throw an exception? or only if some exception occurs then it will throw the exception?
Regards,
Lucky

It doesnt throw exceptions always.
What this means is that if you code inside the method does use some API or function that throws exceptions when a particular condition is not met, you method would throw the same exception to it's caller. If you didn't add the throw exception clause in your method, you would have to try/catch the exception that would be thrown in your code.
Or else, your code won't compile.
Summary:
A method that throws an uncaught, checked exception must include a throws clause in its declaration.
Read this for some additional info:
[Java Exception Handling|http://ajaxweb.wikidot.com/java-exception-handling]
[Sun Java Tutorial - Exceptions|http://java.sun.com/docs/books/tutorial/essential/exceptions/index.html]

In VS 2012 , ReportClass.Export(Exportoptions) throwing Exception "Method not found: 'CrystalDecisions.ReportAppServer.DataDefModel.PropertyBag CrystalDecisions.ReportAppServer.ReportDefModel.ISCRExportOptions.get_ExportOptionsEx()'".

Hi Team,
Problem : we are getting below exception on vs-2012 "Method not found: 'CrystalDecisions.ReportAppServer.DataDefModel.PropertyBag CrystalDecisions.ReportAppServer.ReportDefModel.ISCRExportOptions.get_ExportOptionsEx()'"
Could you please help me why we are getting this Error?
Note : Im not using Exportstream method , just using only Export method (refer code sample) for exporting Crystal report.
EnvironMent Details :
Crystal Report Version : CRforVS_13_0_5.exe
(SAP Crystal Reports runtime engine for >net Framework (64-bit)
SAP crystal Reports ,version for Microsoft Visual studio)
OS -Windows 7 -64 BIT
RAM : 16 GB
code where i Got the Exception
               dfdoFile.DiskFileName = Path.Combine(reportPath, reportFileName);
                expOptions.ExportDestinationType = ExportDestinationType.DiskFile;
                expOptions.ExportFormatType = ExportFormatType.CrystalReport;
                expOptions.DestinationOptions = dfdoFile;
                objReport.Export(expOptions);
below is stack trace :
   at CrystalDecisions.ReportSource.EromReportSourceBase.ExportToStream(ExportRequestContext reqContext)
   at CrystalDecisions.CrystalReports.Engine.FormatEngine.ExportToStream(ExportRequestContext reqContext)
   at CrystalDecisions.CrystalReports.Engine.FormatEngine.Export(ExportRequestContext reqContext)
   at CrystalDecisions.CrystalReports.Engine.ReportDocument.Export(ExportOptions options)
   at Medtech.BaseObjects.Report.CreatePDF(ReportClass objReport, DataView objRptDataView, String printerName, PrinterPaperOrientation
i have attached Screenshot for your reference ,

Hi Sandeep
You are using Service Pack 5 (Crystal Report Version : CRforVS_13_0_5.exe). I'd like you to update your install to SP 13:
SAP Crystal Reports, developer version for Microsoft Visual Studio: Updates & Runtime Downloads
and test.
- Ludek
Senior Support Engineer AGS Product Support, Global Support Center Canada
Follow me on Twitter

How to throw exception in run() method of Runnable?

Hi, everyone:
I want to know how to throw exception in run() method of interface Runnable. Since there is no throwable exception declared in run() method of interface Runnable in Java API specification.
Thanks in advance,
George

Thanks, jfbriere.
I must add though that if your run() methodis
executed after a call to Thread.start(), then
it is not a good choice to throw anyRuntimeException
from the run() method.
The reason is that the thrown exception won't be
handled appropriately by a try-catch block.Why do you say that "the thrown exception won't be
handled appropriately by a try-catch block"? Can you
explain it in more detail?
regards,
George
Because the other thread runs concurrently with and independently of the parent thread, there's no way you can write a try/catch that will handle the new thread's exception: try {
myThread.start();
catch (TheExceptionYouWantToThrowFromRun exc) {
handle it
do the next thing This won't work because the parent thread just continues on after myThread.start(). Start() doesn't throw the exception--run() does. And our parent thread here has lost touch with the child thread--it just moves on to "do the next thing."
Now, you can do some exception handling with ThreadGroup and uncaughtException(), but make sure you understand why the above won't work, in case that was what you were planning to do.

How to throw Exception in Thread.run() method

I want to throw exception in Thread.run() method. How can I do that ?
If I try to compile the Code given below, it does not allow me to compile :
public class ThreadTest {
     public static void main(String[] args) {
     ThreadTest.DyingThread t = new DyingThread();
     t.start();
     static class DyingThread extends Thread {
     public void run() {
     try {
               //some code that may throw some exception here
          } catch (Exception e) {
          throw e;//Want to throw(pass) exception to caller
}

(a) in JDK 1.4+, wrap your exception in RuntimeException:
catch (Exception e)
throw new RuntimeException(e);
[this exception will be caught by ThreadGroup.uncaughtException() of this thread's parent thread group]
In earlier JDKs, use your own wrapping unchecked exception class.
(b) if you know what you are doing, you can make any Java method throw any exception using Thread.stop(Throwable) regardless of what it declares in its "throws" declaration.

Limit the time of lookup and make the method to throw an Exception

When I connect from
Client
Remote Desktop Client
Server:
SUN JAVA SYSTEM APPLICATION SERVER 9.0
Initial Context object is initialized as per below coding,
System.setProperty("org.omg.CORBA.ORBInitialHost", prop.getProperty("hostName"));
System.setProperty("org.omg.CORBA.ORBInitialPort", prop.getProperty("portNumber"));
InitialContext ctx = new InitialContext();
while .lookup("globalJndiNameForSessionBean") method is invoked on the InitialContext object and if the server is not available, it is throwing non stop error.
Please tell me wether I have to add any other Properties to limit the time of lookup and make the method to throw an Exception after two or three second, if the server is not available.

What do you mean by 'non-stop error'? This can only happen if your code goes into a non-stop loop.
The default TCP connect timeout is about 75 seconds, which in some circumstances is too long, but two or three seconds definitely isn't long enough. Ten to twenty would be more like it.
I'm not aware of any system properties that limit the ORB connect timeout but then I'm not aware where the existing J2SE ORB system properties are documented. If anybody has ever found this please let us know.

Throwing exceptions in a TableModel setValueAt method?

I have a TableModel. I would like the setValueAt method to throw an exception if there is an exception.
The problem is that I cant throw an Exception because the method's signiture does not allow it.!! MoreOver, it is the JTable which will call the method. So if I throw a RuntimeException the GUI crumbles!! I and I cant make the user know about the exception.
I dont think that it is a good practice to show the error using a JOptionPane inside the setValueAt method!! I want to pass the exception from the tableModel to the User. what is the best practice?!
thanks..

Swing related questions should be posted in the Swing forum.
what is the best practice?!I don't think there is a way to throw an exception. The default editors change the Border color to RED to indicate an error. If you don't want to show an option pane in the setValueAt (I don't believe it belongs there either), then you could add code to the editor to display an option pane as shown in this posting:
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=645740

Throwing exceptions in an actionPerformed method

it tells me I can't do it
is there a way to get around this?
I'm reading a file inside the method so thats the exception in case it matters

It's not in swing.. i'm making it on eclipse
public void actionPerformed(ActionEvent e) {
read();
//do some stuff
private void read() throws Exception{
BufferedReader reader = new BufferedReader(new FileReader(file));
//read some stuff
thats the lines that are causing me trouble, the only thing i've learned to do is throw exceptions in read() though I know there are better ways such as try{ and catching specific exception I don't know how to use them.
when I try to make actionPerformed throw Exceptions like I did to read() it says:
Exception Exception is not compatible with throws clause in ActionListener.actionPerformed(Action Event)
So... I don't know what to do and this is the final step in a program i've been making for a while now.

Catching or Methods Throwing Exceptions

Hi,
I'm just wondering whats the difference between catching an exception and a method throwing an exception?
I'm a bit confused on their purpose dealing with exceptions.
catching an exception
void p1()
          try{
               p2();
          }catch(IOException ex){
     }method throwing an exception
void p1() throws IOException
          p2();
     }

one more stuff i need to add is that:
When we declare a particular code within a try catch
statement it means that that particular code is very
much prone to an exception , i mean the programeer
knows that code will throw a exception and hence we
mention in try catch block.
But in other case when we suffixed that particular
method with throws clause it means the programmer is
not sure ,that code might throw an exception,hence we
put in throws clause.Not quite, the programmer always knows if a checked exception is being thrown, since the compiler requires it to be caught or having a throws clause. Unchecked (runtime) exceptions don't require a throws clause and the programmer must/can catch it if he wants to.

Exceptions - documentation on which methods throw exceptions ?

Hi, does anyone know where I can find full documentation on iphone SDK methods
The iphone SDK documentation seems to be incomplete.
For instance, the discussion section of the SDK documentation for NSMutableArray addObject method doesn't mention anything about exceptions.
However, the method could throw an exception (and this is mentioned in http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSMu tableArray_Class/Reference/Reference.html)
I'm assuming that alloc will not throw exceptions and that it will just return nil if no memory is available. However, I haven't found any documentation that states this.
Does anyone have a pointer to Apple documentation for methods (that includes information on any (and all) exceptions thrown by the method and also includes information on possible return values for the method) ?

There is this
http://java.sun.com/products/jdbc/driverdevs.html
I am pretty sure that there is little in the meta data stuff that has to be supported.

Getting the name of the page that throws an exception from an error page

How can I get the name of the page that throws an
error exception from an error page?.
Thanks.

In each of your jsp pages, u should set the name of page in the request object. e.g.
In jsp page called main.jsp you should do request.setAttribute("pageName","main.jsp");
Then in error page you can get the name like
String pageInError = (String) request.getAttribute("pageName");
I hope that answers your question.
thx

[svn:osmf:] 9866: Adding '@throws' clauses to ILayoutRenderer add/ remove target methods, and adding a 'targets(target:ILayoutTarget)' method that allows checking addition/removal validity up front.

Revision: 9866
Author:   [email protected]
Date:     2009-09-01 00:56:48 -0700 (Tue, 01 Sep 2009)
Log Message:
Adding '@throws' clauses to ILayoutRenderer add/remove target methods, and adding a 'targets(target:ILayoutTarget)' method that allows checking addition/removal validity up front.
Modified Paths:
    osmf/trunk/framework/MediaFramework/org/openvideoplayer/layout/ILayoutRenderer.as
    osmf/trunk/framework/MediaFramework/org/openvideoplayer/layout/LayoutRendererBase.as

Dispatching GridSelectionEvent throw exception at runtime - A build issue with FB 4.5

This is a strang probelm I am facing with.
My code dispatches GridSelectionEvent after setting girds' selected item in one logic path. Following is code lines -
myDataGrid.selectedItem = instanceTag;
myDataGrid.dispatchEvent(new GridSelectionEvent(GridSelectionEvent.SELECTION_CHANGE));
Flash player throws following error on above statements encounter -
TypeError: Error #1009: Cannot access a property or method of a null object reference.
    at spark.accessibility::DataGridAccImpl/eventHandler()
    at flash.events::EventDispatcher/dispatchEventFunction()
    at flash.events::EventDispatcher/dispatchEvent()
    at mx.core::UIComponent/dispatchEvent()
I am saying it is a strang for me because when I use swf file generated by Flex Builder (4.5)'s export to release build, it does not throw error and code works fine as expected.
But, when I user swf file generated by Ant script, I face the above issue.
The Flex builder settings is as shown in following image -
Ant mxmlc script is as follow -
<mxmlc
           file="${basedir}/src/AppMonConfigWizard.mxml"
            static-rsls="false"
           keep-generated-actionscript="false"
           output="${basedir}/bin-release/AppMonConfigWizard.swf" >
     <locale>en_US</locale>
      <load-config filename="${FLEX_HOME}/frameworks/flex-config.xml"/>
      <source-path path-element="${FLEX_HOME}/frameworks"/>
      <source-path path-element="${basedir}/src/locale/{locale}"></source-path>
      <compiler.library-path file="${basedir}/../wizard_framework/bin/wizard_framework.swc" append="true"/>
     <compiler.library-path file="${basedir}/../../utils/bin/utils.swc" append="true"/>
      <include-resource-bundles>ErrorMessages</include-resource-bundles>
      <include-resource-bundles>Strings</include-resource-bundles>
</mxmlc>
As mentioned earlier that following statements cause exception -
     myDataGrid.selectedItem = instanceTag;
     myDataGrid.dispatchEvent(new GridSelectionEvent(GridSelectionEvent.SELECTION_CHANGE));
If I change it to
     myDataGrid.setSelectedIndex(<some index value>)   /*selectedItem replaced with setSelectedIndex*/
     myDataGrid.dispatchEvent(new GridSelectionEvent(GridSelectionEvent.SELECTION_CHANGE));
it does not throw exception. I would like to mention that myDataGrid.selectedItem = instanceTag; does sets the selected item but then in that case issue arises when dispatching event.
I my application, similar statemetns were lot at many places (as there were no such issue with SDK 3.1 which was using earlier) so instead of making changes there, it would be better to imitate the build that Flex builder uses when exported the release build.
Thanks in advance,
Prithveesingh Zankat.

Solved it: had set the only public surface contracts checkbox by mistake and the cosntructor was protected...
Luis Abreu

Function module JOB_CLOSE throwing exception

Hello,
We have a batch job which has 2 steps:
1) Step 1 uses job_open, job_submit and job_close and immediately schedules batch job A/P_ACCOUNTS which in turn creates batch input sessions A/P_ACCOUNTS.
2) Step 2 Processes A/P_ACCOUNTS sessions created yesterday or today.
In few cases, job_close is throwing exception job_close_failed. I believe that error is coming due to non availability of work processes. Job A/P_Accounts is defined as a class C batch job. There is a check in the FM job_close which does the following check:
- if the class of a batch job is B or C, it calculates the number of free work processes. If there are no work processes available then JOB_CLOSE throws JOB_CLOSE_FAILED exception.
- If the class is u2018Au2019, it skips this check.
We have an option of changing the class of batch job to A but there are some system critical jobs that are running as class A.
My question is:
In the code, JOB_CLOSE has been called for scheduling the job A/P_ACCOUNTS with parameter start immediately. Can anyone please let me know what will happen if function JOB_CLOSE is not called with start immediately option? Will the batch job A/P_ACCOUNTS wait till the time work processes are available?
Or, can anything else be done to solve the issue?
Regards,
Siddharth

HI,
This is my experience with job_close..
when i was working in zprograms then i was able to scedule it any time i wanted..
but in my standard program when i tried it didn't worked....
so i have to use that option of starting it immediately..
and then it is working fine..
now if i schedule 5 jobs... one after another..
its get queued up...and once the processor is free...its working..
my code of job close
CALL FUNCTION 'JOB_CLOSE'
    EXPORTING
      jobcount             = job_count
      jobname              = job_name
      strtimmed            = yes " yes = 'X'
    IMPORTING
      job_was_released     = job_released
    EXCEPTIONS
      cant_start_immediate = 1
      invalid_startdate    = 2
      jobname_missing      = 3
      job_close_failed     = 4
      job_nosteps          = 5
      job_notex            = 6
      lock_failed          = 7
      invalid_target       = 8
      OTHERS               = 9.
regards,
Yadesh

How can I implement a get method that lets me divide two values, Help plz

I need to implement a method that divides the values return by two other methods but I keep getting an error message, I think its divide by zero error ( I am not too sure on the exact error msg as I do not have java installed on this pc as yet), here is my example,
I have two get methods that take an int value so say
getValueOne() as method one
getValueTwo() as method two
Now I have a third method that does the following,
Public int getValueThree() {
int value =0;
value = (getValueOne() / getValueTwo())
return value;
I am not two sure on the exact code but it does something like this and I get an error. Could someone please guide me how I can successfully implement a get method that divides two values that are returned by two methods.
Thanks,
Zub

Hi, thanks for your reply. Right, how can I go about to throw an exception? I can definitely give the exact code and error message tomorrow when I can access my home pc.
And you are right there are some values that are zero! I am not very sure what throwing an exception means to be honest. Could you please give an example?
Thanks...

Exporting methods that throw exceptions?

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