Catching DML Exception in onCommit method, how to revert /rollback?

Hi,
JDev 10.1.2, ADF/Struts
Flow: Registrate -> Confirm -> Message Registrated
I need to catch Exception/Errors when the problems occur during the commit.
I added a try catch block but the Exception isn't caught
so I check to see if there are errors after the doIt gets called.
Am I missing something?
Other question, I tried to use the following code to keep the created row after rollback:
AM.getTransaction().setClearCacheOnRollback(false); // to keep the created entities
AM.getTransaction().rollback();
but it seems that the created row is not maintained after a duplicate index exception is caught?
I added a onCommit method in my ConfirmAction:
public void onCommit(DataActionContext ctx)
try {
if (ctx != null)
if (ctx.getEventActionBinding() != null)
ctx.getEventActionBinding().doIt();
if (this.hasErrors(ctx))
System.out.println(getClass().getName()+".onCommit after doIt => hasErrors");
// get application module
// rollback
// forward to registrate
catch (Exception ex) {
System.out.println(getClass().getName()+".onCommit Exception caught ex: "+ex.toString());
ex.printStackTrace();
// No exception caught if problem in Commit
Thanks for your help
Fred

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import java.awt.event.*;
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import java.util.*;
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import org.xml.sax.*;
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import javax.xml.transform.stream.*;
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If you compile it, you will realise that I get an error about exception handling. My lecturer gave me an example code of how to do the same thing without using a GUI:
import javax.xml.parsers.*;
import org.xml.sax.*;
import java.io.*;
import java.util.*;
import org.w3c.dom.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
public class CallDOM
     Document doc;
     File file;
     Scanner input;
     int year, month, day;
     String currentYear, currentMonth;
     public static void main(String args[]) throws Exception
          CallDOM cd=new CallDOM();
     CallDOM() throws Exception
          file=new File("Diary.xml");
          //create DOM from file
          doc = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(file.toURL().toString());
          input=new Scanner(System.in);
          System.out.println("1) Create entry");
          System.out.println("2) Read entry");
          System.out.println("3) Show Diary");
          System.out.println("4) Quit");
          int choice=input.nextInt();
          while(choice!=4)
               switch(choice)
                    case 1: GetDate();CreateEntry(doc.getDocumentElement());break;
                    case 2: GetDate();ReadEntry(doc.getDocumentElement());break;
                    case 3: ShowDiary(doc.getDocumentElement());
               System.out.println("1) Create entry");
               System.out.println("2) Read entry");
               System.out.println("3) Show Diary");
               System.out.println("4) Quit");
               choice=input.nextInt();
          writeXmlFile();
     public void GetDate()
          System.out.println("Enter date (dd mm yyyy)");
          day=input.nextInt();
          month=input.nextInt();
          year=input.nextInt();
     public boolean ReadEntry(Node node)
          node = getYear(node);
          if(node==null) return false;
          node = getMonth(node);
          if(node==null) return false;
          node = getDay(node);
          if(node==null) return false;
          node = node.getFirstChild();
          while(node!=null)
               System.out.println(node.getNodeValue().trim());
               node=node.getNextSibling();
          return true;
     public boolean CreateEntry(Node node)
          Node searchNode;
          searchNode = getYear(node);
          if(searchNode==null)
               Element newNode = doc.createElement("Year");
               searchNode = node.appendChild(newNode);
               newNode.setAttribute("Id",Integer.toString(year));
          node = searchNode;
          searchNode = getMonth(node);
          if(searchNode==null)
               Element newNode = doc.createElement("Month");
               searchNode = node.appendChild(newNode);
               newNode.setAttribute("Id",Integer.toString(month));
          node = searchNode;
          searchNode = getDay(node);
          if(searchNode==null)
               Element newNode = doc.createElement("Day");
               searchNode = node.appendChild(newNode);
               newNode.setAttribute("Id",Integer.toString(day));
          node = searchNode;
          System.out.println("Enter Text");
          String entry=input.next();
          entry+=input.nextLine();
          Node textNode = doc.createTextNode(entry);
          node.appendChild(textNode);
          return true;
     public void ShowDiary(Node node)
          Stack<Node> stack=new Stack<Node>();
          Node child;
          stack.push(node);
          while(!stack.empty())
               node = stack.pop();
               if(ProcessNode(node))
                    child = node.getLastChild();
                    while(child!=null)
                         stack.push(child);
                         child = child.getPreviousSibling();
     private boolean ProcessNode(Node node)
          if(node.getNodeName().equals("Year"))
               currentYear=node.getAttributes().item(0).getNodeValue();
          if(node.getNodeName().equals("Month"))
               currentMonth=node.getAttributes().item(0).getNodeValue();
          if(node.getNodeName().equals("Day"))
               System.out.print(node.getAttributes().item(0).getNodeValue()+"/"+
                                        currentMonth+"/"+currentYear+": ");
               node=node.getFirstChild();
               while(node!=null)
                    System.out.println(node.getNodeValue().trim());
                    node=node.getNextSibling();
               return false;
          return true;
     private Node getYear(Node node)
          node=node.getFirstChild();
          while(node!=null)
               if(node.getNodeName().equals("Year")
                    && Integer.valueOf(node.getAttributes().item(0).getNodeValue())==year)
                         return node;
               node = node.getNextSibling();
          return null;
     private Node getMonth(Node node)
          node=node.getFirstChild();
          while(node!=null)
               if(node.getNodeName().equals("Month")
                    && Integer.valueOf(node.getAttributes().item(0).getNodeValue())==month)
                    return node;
               node = node.getNextSibling();
          return null;
     private Node getDay(Node node)
          node=node.getFirstChild();
          while(node!=null)
               if(node.getNodeName().equals("Day")
                    && Integer.valueOf(node.getAttributes().item(0).getNodeValue())==day)
                    return node;
               node = node.getNextSibling();
          return null;
     private void writeXmlFile() throws Exception
        Source source = new DOMSource(doc);
        Result result = new StreamResult(file);
        Transformer xformer = TransformerFactory.newInstance().newTransformer();
        xformer.setOutputProperty(OutputKeys.INDENT,"yes");
        xformer.setOutputProperty(OutputKeys.DOCTYPE_SYSTEM,"Diary.dtd");
        xformer.transform(source, result);
}My question is, why does the exceptions in the example code not need to be caught? And why do I have to catch the exceptions in my code? Several exceptions are thrown in the example code, but there is no catch statement.
Thanks for any advice!!

Since your question didn't come with any relevant details, and since you have huge steaming piles of irrelevant code, all I can give is a general answer to "Why do I need to catch this exception?"
[url http://java.sun.com/docs/books/tutorial/essential/exceptions/index.html]Exception tutorial at http://java.sun.com/docs/books/tutorial/essential/exceptions/index.html
Here's a quick overview of exceptions:
The base class for all exceptions is Throwable. Java provides Exception and Error that extend Throwable. RuntimeException (and many others) extend Exception.
RuntimeException and its descendants, and Error and its descendants, are called unchecked exceptions. Everything else is a checked exception.
If your method, or any method it calls, can throw a checked exception, then your method must either catch that exception, or declare that your method throws that exception. This way, when I call your method, I know at compile time what can possibly go wrong and I can decide whether to handle it or just bubble it up to my caller. Catching a given exception also catches all that exception's descendants. Declaring that you throw a given exception means that you might throw that exception or any of its descendants.
Unchecked exceptions (RuntimeException, Error, and their descendants) are not subject to those restrictions. Any method can throw any unchecked exception at any time without declaring it. This is because unchecked exceptions are either the sign of a coding error (RuntimeException), which is totally preventable and should be fixed rather than handled by the code that encounters it, or a problem in the VM, which in general can not be predicted or handled.

Error in Raising exceptions in a method and handling the same in the WF

Hi All
I tried to implement Raising exceptions in a method and handling the same in the workflow
in the same way given in SAPtechnical site .
1.by adding a error msg in exception parameter .
2. if the select query fails, to fetch the agent then :exit_return 9001 'ztable name' space space space.
3.in the Background activity in which this method is called there automatically one outcome appears ,and I hav acitvated that outcome and in that done what need to be done for that error handling - just send a mail to concern person .
4. in the normal outcome of the activity , the step to be executed are there .
but its not working , if exception come then the WF stuck there only . it do not follow the exception outcome .
Kindly help me , How can I do the exception handly in WF.
thanks & Regards
Kakoli

> That is usually the case - you catch an error in the underlying program and pass that back so the workflow can go into error.
> You're doing it correctly.
I don't think that's quite right.
If you define an error/exception in a method, it is automatically mapped to an outcome of the step/task.
If you activate that outcome, then you can handle the exception in a branch of the workflow.
For example: 'Remote connection is down, please contact Basis'
The step should only go into error if an outcome occurs that you have NOT activated.
So the original question is valid. Please give some more information on what the error message is..
chrs
Paul

Catching an exception (help)!!!

Hi everyone, the problem i have is when the user enters a number that is out of bounds (higher or lower than the excepted values it should prompt the program to write to the screen "out of range, try again" or something along those lines.
However, it instead just prints "error - program terminated" which is the message that should be printed when there is a different problem within the program.
Can anyone help me get the program to print the correct messages, you can see what i mean from the code:
import java.io.*;
import java.util.ArrayList;
public class FlatCost {
    ArrayList floors = new ArrayList();
    public FlatCost(String filename) {
        try    {
            readDataFromFile(filename);
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            int floor;
            int rooms;
            String another = "y";
            while(another.equalsIgnoreCase("y"))      {
                System.out.print("\nEnter floor number (0 for ground): ");
                floor = Integer.parseInt(in.readLine());
                if(floor < 0 || floor > floors.size())        {
                System.out.println("floor out of range, try again");
            else        {
                System.out.print("\nEnter no. rooms: ");
                rooms = Integer.parseInt(in.readLine());
                if(rooms < 0 || rooms > ((String[])floors.get(floor)).length)          {
                    System.out.println("rooms out of range, try again");
                else          {
                    System.out.println("\nThe cost of a "+rooms+"-room flat on floor "+floor+" is "+
                    ((String[])floors.get(floor))[rooms+1]+" per month");
                    System.out.print("\nAnother? (y/n): ");
                    another = in.readLine();
        catch(Exception e){
            System.out.println("error - program terminated");
public void readDataFromFile(String filename)throws Exception {
BufferedReader br = new BufferedReader(new FileReader(filename));
String line = "";
while((line = br.readLine()) != null)
floors.add(line.split(" "));
br.close();
public static void main(String args[])throws IOException{
new FlatCost(args[0]);
}any help is appreciated
thanks
Sarah x

I barely know where to begin.
Start by printing out the stack trace when you catch an exception. That'll give you more information than the message you're printing out. You know the program is terminating - you need to know why.
You're writing in a VERY procedural style. There's little or nothing object-oriented about what you're doing.
You've got a bunch of stuff in that constructor that really doesn't belong there. You shouldn't have code to continuously ask a client for a floor and room number in a constructor. That really belongs in an application that drives the object, like the main method that you wrote.
Your FlatCost can read in a file that contains floor/room/price information, but if I were writing the application I'd read it in and store it in the ArrayList as you've done. Then I'd have a getCost() method that would take floor and room count as parameters and return the total cost.
Learning how to program is learning how to debug. I'd rewrite things a little bit and put System.out.println() statements into the code to narrow down exactly where the error was occurring and why. It won't take you long to figure it out. You don't even need a fancy debugger or IDE.

Write and read txt files and catch the exceptions

hey everyone, im in a bit of a bind. im trying to set up this try catch statement. here is what i have for code so far.
import java.util.Scanner;
import java.io.*;
public class Warning
    //   Reads student data (name, semester hours, quality points) from a
    //   text file, computes the GPA, then writes data to another file
    //   if the student is placed on academic warning.
    public static void main (String[] args)
     int creditHrs;         // number of semester hours earned
     double qualityPts;     // number of quality points earned
     double gpa;            // grade point (quality point) average
     String line, name, inputName = "students.dat";
     String outputName = "warning.dat";
     try
          Scanner FileScan1 = new Scanner (new File("students.dat"));
          // Set up scanner to input file
          // Set up the output file stream
          // Print a header to the output file
          outFile.println ();
          outFile.println ("Students on Academic Warning");
          outFile.println ();
          // Process the input file, one token at a time
          while (FileScan1.hasNext())//there is another line...
              {               // Get the credit hours and quality points and
               // determine if the student is on warning. If so,
               // write the student data to the output file.
          // Close output file
     catch (FileNotFoundException exception)
          System.out.println ("The file " + inputName + " was not found.");
     catch (IOException exception)
          System.out.println (exception);
     catch (NumberFormatException e)
          System.out.println ("Format error in input file: " + e);
}I am pretty sure the layout is good to go, but first and foremost that try statement is hanging me up. Could someone give me some suggestions about how i should set this up.
i want to read in this students.dat file, then output another file called warning.dat.
Thanks i really appreicate the help.

no, i was really hoping to just see if the way it is
set up it will be doable, that way i wouldn't be
working on code that was impossiable to sort through
properlyFair enough.
One thing I'd suggest is that if you're really basically only going to be printing the exceptions, and since that is the top-level method (main) --
I'd instead just add some "throws" clauses to main, get rid of the try/catch stuff, and just let the VM handle the exceptions for you. It will print them, just like you're doing, except that it will also print the stack traces, which you are not doing.
If you're going to handle exceptions, it's better to actually do something about them rather than just print them - otherwise you might just as well let the runtime do that for you.

Static abstract methods - how can I avoid them?

Hi everybody,
just found out that java doesn't allow static abstract methods nor static methods in interfaces. Although I understand the reasons, I can't think of how to change my design to gain the required behavior without the need of static abstract methods.
Here's what I want to do and how my thoughts lead to static abstract methods:
ClassA provides access to native code (c-dll, using jna). The path to the dll can be set programmatically. Here's a draft of the class:
public ClassA {
   private static String path;
   public static void setRealtivePath(String path) {
      //check if path exists and is not null -> get absolute path
      setPath(path);
   public static void setPath(String absolutePath) {
      this.path = path;
//code to provide access to native lib
}There is some more classes which provide access to different dlls (therefore the code for accessing the dlls differs from ClassA). Although this works, the setRelativePath method has to be implemented in each class. I thought it would be nice to put this method into a abstract super class that looks like this:
public abstract class superClass {
   public static void setRelativePath(String path) {
      //check if path exists and is not null -> get absolute path
      setPath(path);
   //force inherting class to implement a static method
   public static abstract void setPath(String absolutePath);
}thus simplifying ClassA and it's look-a-likes:
public ClassA {
   private static String path;
   @Override
   public static void setPath(String absolutePath) {
      this.path = path;
//code to provide access to native lib
}Since static abstract methods (and overriding static methods) is not allowed, this doesn't work.
I hope someone can catch my idea ;). Any suggestions how to do this in a nice clean way?
Thanks in advance,
Martin
Edited by: morty2 on Jul 22, 2009 2:57 AM

First of all, thanks a lot for your answer.
YoungWinston wrote:
Actually, you can "override" static methods (in that you can write the same method for both a subclass and a superclass, providing the superclass method isn't final); it's just that it doesn't work polymorphically. The "overriding" method masks the overridden one and the determination of what gets called is entirely down to the declared type.Yes, I know that. There's one problem: Your suggestion means that I simply have to drop the abstract modifier in the super classes setPath method. However, since the super class calls the setPath method (and not the inherting classes!) it will always be the super classes' method being called.
YoungWinston wrote:
Why are you so concerned with making everything static? Seems to me that the simplest solution would be to make all the contents instance-based.I want ClassA and it's look-a-likes to be set up properly at application start up, be accessible quite anytime and easily, they don't do anything themselves except for setting the path and calling into the native library which does the math. (Compareable to how you call e.g. Math.cos()). Therefore I don't think that an instance-based solution would be a better approach.
YoungWinston wrote:
Furthermore, you could make the class immutable; which might be a good thing - I'm not sure I'd want someone being able to change the pathname after I've >set up a class like this.Thanks for that!
PS: As mentioned in my first post, I do have a working solution. However, I'm really corious about finding a nicer and cleaner way to do it!
Martin

Throw JBO exception from doDML method-urgent HELP

Hi,
I am catching an exception on deleting a parent record without deleting a child record(FK constraint) in doDML delete operation method,when i am throwing a JBOexception with a custom message with in the catch block it is not refelecting in the front end,how can i display the FK contraint as a custom message in the front end?
however i was able to throw a jbo exception in TP2 with in the doDml method,which was displaying to the front end.
im using ADf TP3 11g
-regards

Hi,
a similar question was posted last week. I replied saying that TP3 is supposed to work as TP2. If this isn't the case, please wait for TP4 to verify if the problem still exist and if, post another message with a reproducible testcase. TP4 will be out soon
Frank

Catching DML Exception in onCommit method, how to revert /rollback?

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