Exception Handling in Java .. Help

Hi folks I needed some help in exception handling ...
I know that I could go like this
public class MyClass
     public static void main(String args[])
          try
          System.out.println(1/0);
          catch(java.lang.Exception e)
               e.printStackTrace();
Now what if i want to throw an error for example in C++ we would go like
try
throw 1;
throw 0;
throw 'A';
catch (int i) //If exception is of integer type ... you may overload it
cout << "Integer value thrown and caught \n";
catch (...) //Unexpected error
cout << "Some other unexpected exception \n";
How could i impliment a code such as the above in Java using throw...
Thanks again folks...

1. When you post code, use code tags to make it readable. Copy/paste from your original source in your editor (NOT from your earlier post here), highlight the code, and click the CODE button. Use the Preview tab to see how your post will work.
2. [http://download.oracle.com/javase/tutorial/essential/exceptions/]

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Study security related exception handling in Java

Hi all,
I am required to do an indepth study on security-related exception handling in Java, their Pluses and minuses... Can ppl suggest me places where I can get a kick start? Any resource that u know can help me out?
I appreciate ur help in this regard...FYI, I am a grad student and I am doing this as a part of my course-work...I am writing up a report on this...
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Take a look at the JAAS API and docs.
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We have developed a client java application with our own exception hierarchy derived from java.lang.exception. We raise our own exception in case of error scenarios. But there is one additional thing which we want to do:
1. When ever any exception is raised in our exception we want to do some generic exception handling (like kicking of some module which collects the log files and send it to the administrator.
2. We want the above activity to happen also when any runtime exception is raised. We are not catching any runtime exception and we have no handle for this.
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We do not want to have done at every catch block we have in our code. I mean we want to have some hook at a very generic place.
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As far as I know, for exceptions that are caught, you must make a call to a generic handler in the catch block, or you may rethrow the exception as a RuntimeException, and let it propagate.
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Integration Process exception handling & alerts, Java

Hello,
I would like to enhance my basic scenarios fool proof and with as much Java as possible.
I have set up several asynchronous and synchronous File to SOAP transfers between systems A and B
using PI70 including my own Java mapping classes and PI's AF_Modules beans. They work just fine.
I have not designed my own Integration Processes yet, so execution is based on channel settings and availability timing.
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Hi m,
Strange Name
>>I have learned this aproach may be exposed to general faults resulting manual monitoring and repairing. For example server problems at receiver side can result data losses as sender channel just keeps removing source files like normally, as the process would be better to just stop right there and alert or something.
If you are looking to handle this particular scenario, then we have the alert mechanism and CCMS monitoring. There you will come to know whether the end system down or not.
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Regards
Suraj

Give me a idea for null pointer exception handling in java

dear friends,
Now i'm doing one program thats read a xml file element and store on txt file in java.now it's working but i have one problem.The problem is the parent node have number of child node.For a example, now i read the file.The first parent have a 5 child.that time work.the next parent have a 4 child this time one child is not on there.so now my program show one run time error.thats "NullPointerException" please give me a solution.its very urgently.
advance Thanks !

import java.io.*;
import org.w3c.dom.Document;
import org.w3c.dom.*;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
public class rsk1{
public static void main (String argv []){
try {
               int j=0,arry=0;
               FileWriter Out = new FileWriter("file1.txt");
               BufferedWriter f1 = new BufferedWriter (Out);
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document doc = docBuilder.parse (new File("Transaction.xml"));
// normalize text representation
doc.getDocumentElement ().normalize ();
System.out.println ("Root element of the doc is " +
doc.getDocumentElement().getNodeName());
NodeList listOfPersons = doc.getElementsByTagName("transactionid");
int totalPersons = listOfPersons.getLength();
System.out.println("Total no of people : " + totalPersons);
arry = totalPersons * 5;
String sr[] = new String[arry];
               String s1=" ";
               int k=0;
for(int s=0; s<listOfPersons.getLength() ; s++,k++){
Node firstPersonNode = listOfPersons.item(s);
for(int r=0; r<4;r++)
if(firstPersonNode.getNodeType() == Node.ELEMENT_NODE){
Element firstPersonElement = (Element)firstPersonNode;
NodeList firstNameList = firstPersonElement.getElementsByTagName("item");
Element firstNameElement = (Element)firstNameList.item(r);
NodeList textFNList= firstNameElement.getChildNodes(); //ERROR OCCUR IN THIS LINE
sr[++j]=((Node)textFNList.item(0)).getNodeValue().trim();
}//end of if clause
}//end of for loop with s var
System.out.println("Process completed");
for(int i=1;i<=j;i++)
     f1.write(sr);
                                   f1.write(" ");
                                   if(i%3==0)
                                        f1.newLine();
f1.close();
}catch (SAXParseException err) {
System.out.println ("** Parsing error" + ", line "
+ err.getLineNumber () + ", uri " + err.getSystemId ());
System.out.println(" " + err.getMessage ());
}catch (SAXException e) {
Exception x = e.getException ();
((x == null) ? e : x).printStackTrace ();
}catch (Throwable t) {
t.printStackTrace ();
}//end of main

OPEN out_cur FOR        SELECT exception handling help

Here is the stored procedure for reading a data based on the input, if no data then return null ref cursor and proper error message.
I am not sure, i am handling proper exception handling ? Please help me to complete this item.
Thanks.
PROCEDURE testing
module IN VARCHAR2,
module_id IN VARCHAR2,
out_cur OUT SYS_REFCURSOR,
out_error_no OUT NUMBER
BEGIN
out_error_no := 0;
CASE
WHEN module = 'a' AND module_id = 'b' THEN
BEGIN
OPEN out_cur FOR
SELECT id,
mime_type,
file_length,
file_name ,
uploadeddate,
created_user ,
status_name
FROM l_table_cnt
WHERE id = module_id;
EXCEPTION
WHEN OTHERS THEN
OPEN out_cur_file_cursor FOR
SELECT
NULL id,
NULL mime_type,
NULL file_length,
NULL file_name,
NULL uploadeddate,
NULL created_user,
NULL status_name
FROM dual
WHERE 1= 0;
out_error_no := 2;
RAISE_APPLICATION_ERROR(-20024,'No Document ');
END;

Venkadesh wrote:
The correct way is to just open the ref cursor and pass it back and then the receiving code that is going to use that cursor handles whether there is any code in it or not. can you please explain with simple exampleIs it really that difficult?
Ok...
Here's the procedure to return a ref cursor...
SQL> ed
Wrote file afiedt.buf
1 create or replace procedure get_rc(p_deptno in number, p_rc out sys_refcursor) is
2 begin
3    open p_rc for 'select * from emp where deptno = :1' using p_deptno;
4* end;
SQL> /
Procedure created.Now we have some application that wants to consume a ref cursor... in this case the application is SQL*Plus, but it could be Java or .NET etc.
It declares it's local reference to the ref cursor...
SQL> var r refcursor;then calls the procedure to get a ref cursor reference assigned...
SQL> exec get_rc(10, :r);
PL/SQL procedure successfully completed.Now, the application itself determines if there is any data when it comes to actually perform the fetches on it...
SQL> print r;
     EMPNO ENAME      JOB              MGR HIREDATE                    SAL       COMM     DEPTNO
      7782 CLARK      MANAGER         7839 09-JUN-1981 00:00:00       2450                    10
      7839 KING       PRESIDENT            17-NOV-1981 00:00:00       5000                    10
      7934 MILLER     CLERK           7782 23-JAN-1982 00:00:00       1300                    10in the above case it had data, so it displayed it.
So what if there isn't any data...
SQL> exec get_rc(90, :r);
PL/SQL procedure successfully completed.
SQL> print r;
no rows selected
SQL>SQL*Plus (the application that calls the procedure) is the one that has determined that there was not data when it came to fetch it (using the print statement in this case). And when it found there was no data it handled it itself (in this case printing the message "no rows returned").
The procedure doesn't have to do any overhead of determining if there is data going to be returned or not, because it's not it's responsibility and completely unnecessary. The calling application can easily determine if there is data or not when it starts to try and fetch it.

Handling exceptions in EBS Java concurrent program

Hi,
I want to do exception handling in Java concurrent program, is there any standard set of exceptions already provided by EBS for concurrent programs or should I create my own Exception class for exception handling.
Thanks!

Hi Kashif, Thanks for replying.
I am creating a Java concurrent program in EBS by implementing the interface - oracle.apps.fnd.cp.request.JavaConcurrentProgram
EBS Version - 12.1.3
DB - Oracle Database 11g Express Edition Release 11.2.0.2.0 - 64bit
OS - Oracle Linux Server release 6.2
Also can I create a properties file to store messages and access the file from my concurrent program.
Thanks!

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Hi,
I'm new to Java so I'm a little rusty with exception handling. Please help me with this portion of my code. I'm supposed to screen out the bad input by the user. The user has to enter a double value and not an illegal value, for example: 45ab would be unacceptable. I've tried this way but after entering a number, the program just exits. Thanks first for helping me out.
import javax.swing.*;
import java.io.*;
import java.text.*;
public class Circle {
public static double readDouble() {
boolean done = false;
String s;
double d=0;
while (!done) {
JOptionPane.showInputDialog("Enter a double : ");
System.out.flush();
try {
BufferedReader in = new BufferedReader (
new InputStreamReader(System.in));
s = in.readLine();
d = Double.parseDouble(s);
d = new Double(s).doubleValue();
done = true;
}catch (IOException e){
done = true;
}catch (NumberFormatException e1){
JOptionPane.showMessageDialog(null,"Error -- input a double -- Try again");
return d;
public static void area(){
double radius1;
double area;
radius1 = readDouble();
area = (radius1 * radius1) * Math.PI;
// Rounding the area value to 2 decimal places
NumberFormat nf = NumberFormat.getNumberInstance();
nf.setMaximumFractionDigits(2);
JOptionPane.showMessageDialog(null, "The area is " + nf.format(area));
// There are more code after this.

Hello, I quickly wrote a possible solution to your problem, hope it will help you. (ICQ #28985387)
import javax.swing.*;
public class InputExample {
public static double getDouble() {
String input;
do {
input = JOptionPane.showInputDialog(null, "Enter a double", "Input", JOptionPane.QUESTION_MESSAGE);
} while(!validateDouble(input));
return Double.parseDouble(input);
private static boolean validateDouble(String input) {
double num = 0;
try {
if(input.length() == 0) {
JOptionPane.showMessageDialog(null, "Please enter a value", "Warning", JOptionPane.WARNING_MESSAGE);
return false;
num = Double.parseDouble(input);
} catch(NullPointerException exception) {
System.exit(0);
} catch(NumberFormatException exception) {
JOptionPane.showMessageDialog(null, "Not a double", "Warning", JOptionPane.WARNING_MESSAGE);
return false;
if (num < -Double.MAX_VALUE || Double.MAX_VALUE < num) {
JOptionPane.showMessageDialog(null, "Must be between\n" + (-Double.MAX_VALUE) + "\nand " + Double.MAX_VALUE, "Warning", JOptionPane.WARNING_MESSAGE);
return false;
return true;
}

Exception Handling Within Methods

I'm currently looking over exception handling within Java and have what whats probably a very simple question to answer!
If within a method I have a try and catch block to handle all exceptions that the specific method may throw, do I then also need to specify the exceptions that the method will throw within its signature? (As I have already handled them).

After a bit more reading I think i've found my answer.
You only declare a method throws an exception if you wish to deal with it further up the method call stack. This raises another question though. If I did handle the exceptions that my method could throw within the method itself as well as declaring the method to throw the exceptions within its signature. What would happen?

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hi,
I am currently implementing try {} catch(Exception expp) { throw expp;} to handle exceptions in my intranet appln.
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Here are some articles for your reference:
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http://www.codeproject.com/Articles/26236/Handling-Error-Centrally-in-a-SharePoint-Applicati
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Pls help..Constructor,setter, getter and Exception Handling Problem

halo, im new in java who learning basic thing and java.awt basic...i face some problem about constructor, setter, and getter.
1. I created a constructor, setter and getter in a file, and create another test file which would like to get the value from the constructor file.
The problem is: when i compile the test file, it come out error msg:cannot find symbol.As i know that is because i miss declare something but i dont know what i miss.I post my code here and help me to solve this problem...thanks
my constructor file...i dont know whether is correct, pls tell me if i miss something...
public class Employee{
     private int empNum;
     private String empName;
     private double empSalary;
     Employee(){
          empNum=0;
          empName="";
          empSalary=0;
     public int getEmpNum(){
          return empNum;
     public String getName(){
          return empName;
     public double getSalary(){
          return empSalary;
     public void setEmpNum(int e){
          empNum = e;
     public void setName(String n){
          empName = n;
     public void setSalary(double sal){
          empSalary = sal;
my test file....
public class TestEmployeeClass{
     public static void main(String args[]){
          Employee e = new Employee();
               e.setEmpNum(100);
               e.setName("abc");
               e.setSalary(1000.00);
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               System.out.println(e.getName());
               System.out.println(e.getSalary());
}**the program is work if i combine this 2 files coding inside one file(something like the last part of my coding of problem 2)...but i would like to separate them....*
2. Another problem is i am writing one simple program which is using java.awt interface....i would like to add a validation for user input (something like show error msg when user input character and negative number) inside public void actionPerformed(ActionEvent e) ...but i dont have any idea to solve this problem.here is my code and pls help me for some suggestion or coding about exception. thank a lots...
import java.awt.*;
import java.awt.event.*;
public class SnailTravel extends Frame implements ActionListener, WindowListener{
   private Frame frame;
   private Label lblDistance, lblSpeed, lblSpeed2, lblTime, lblTime2, lblComment, lblComment2 ;
   private TextField tfDistance;
   private Button btnCalculate, btnClear;
   public void viewInterface(){
      frame = new Frame("Snail Travel");
      lblDistance = new Label("Distance");
      lblSpeed = new Label("Speed");
      lblSpeed2 = new Label("0.0099km/h");
      lblTime = new Label("Time");
      lblTime2 = new Label("");
      lblComment = new Label("Comment");
      lblComment2 = new Label("");
      tfDistance = new TextField(20);
      btnCalculate = new Button("Calculate");
      btnClear = new Button("Clear");
      frame.setLayout(new GridLayout(5,2));
      frame.add(lblDistance);
      frame.add(tfDistance);
      frame.add(lblSpeed);
      frame.add(lblSpeed2);
      frame.add(lblTime);
      frame.add(lblTime2);
      frame.add(lblComment);
      frame.add(lblComment2);
      frame.add(btnCalculate);
      frame.add(btnClear);
      btnCalculate.addActionListener(this);
      btnClear.addActionListener(this);
      frame.addWindowListener(this);
      frame.setSize(100,100);
      frame.setVisible(true);
      frame.pack();
    public static void main(String [] args) {
        SnailTravel st = new SnailTravel();
        st.viewInterface();
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       if (e.getSource() == btnCalculate){
          SnailData sd = new SnailData();
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       sd.setDistance(distance);
              sd.setSpeed(0.0099);
          sd.setTime(distance/sd.getSpeed());
          String answer = Double.toString(sd.getTime());
          lblTime2.setText(answer);
          lblComment2.setText("But No Exception!!!");
       else
       if(e.getSource() == btnClear){
          tfDistance.setText("");
          lblTime2.setText("");
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               System.exit(1);
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    public void windowDeiconified (WindowEvent e) { };
    public void windowIconified (WindowEvent e) { };
    public void windowActivated (WindowEvent e) { };
    public void windowDeactivated (WindowEvent e) { };
    public void windowOpened(WindowEvent e) { };
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   private double speed;
   private double time;
   public SnailData(){
      distance = 0;
      speed = 0;
      time = 0;
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      return distance;
   public double getSpeed(){
      return speed;
   public double getTime(){
      return time;
   public void setDistance(double d){
      distance = d;
   public void setSpeed(double s){
      speed = s;
   public void setTime(double t){
      time = t;
}Pls and thanks again for helps....

What i actually want to do is SnailTravel, but i facing some problems, which is the
- Constructor,setter, getter, and
- Exception Handling.
So i create another simple contructor files which name Employee and TestEmployeeClass, to try find out the problem but i failed, it come out error msg "cannot find symbol".
What i want to say that is if i cut below code (SnailTravel) to its own file(SnailData), SnailTravel come out error msg "cannot find symbol".So i force to put them in a same file(SnailTravel) to run properly.
I need help to separate them. (I think i miss some syntax but i dont know what)
And can somebody help me about Exception handling too pls.
class SnailData{
   private double distance;
   private double speed;
   private double time;
   public SnailData(){
      distance = 0;
      speed = 0;
      time = 0;
   public double getDistance(){
      return distance;
   public double getSpeed(){
      return speed;
   public double getTime(){
      return time;
   public void setDistance(double d){
      distance = d;
   public void setSpeed(double s){
      speed = s;
   public void setTime(double t){
      time = t;
}

Java Exception Handling

Hello everyone,
I'm searching for a design pattern / framework to manage exception handling. I'm currently working on a distributed document management system for PC / AS/400, which consists of Commandline clients, a Socket Server and a windows NT daemon in java, which accepts network requests from the Socket Server. Communication is done via serialized Objects.
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thanks in advance for any answers
regards

You should look into Bridge [GOF:151] and Memento [GOF:273].
Bridge allows you to decouple your mechanism from the implementation memento on how to propergate the decoupled exception information.

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My problem is test the exact exceptions returned by JAVA Standard Engine for program handling.
I work in systems usually set to "Italian Locale" and the result is different in different platforms.
When I work in MSWindows with Java almost messages are in English but not all, for example IOException "Cannot assign requested address" in the Italian Locale is "Indirizzo richiesto non valido nel proprio contesto" but other messages like "Socket Closed" remain "Socket Closed".
Catch the exact exception through description is not a good idea but I don't found other way for Java SE native exceptions!
In Solaris I try to set English LANG environment in the user context and it works.
In MS Windows I try to set the definition in start java with:
*"java -Duser.language=en -Duser.region=US"*
and in the code I try to add the statement:
Locale.setDefault(Locale.US);
but without results.
Is there anybody that has the same problem?
Is there a better way to catch the exact type of Java SE exceptions ?
My test Environments:_
Solaris 10 jdk 1.6.0.02
MS Windows 2000 jdk 1.6.0.02
MS Windows XP jdk1.6.0.02 and 1.5.0.12
Fragment program example for additional explanation:_
try {
} catch (IOException ex) {
if (ex.getMessage().equals("Socket Closed"))
System.out.println("Ok socket closed exception catched");
if (ex.getMessage().equals("Cannot assign requested address"))
System.out.println("Ok assign requested address exception catched");
}

My problem is test the exact exceptions returned by JAVA Standard Engine for program handling.
I work in systems usually set to "Italian Locale" and the result is different in different platforms.
When I work in MSWindows with Java almost messages are in English but not all, for example IOException "Cannot assign requested address" in the Italian Locale is "Indirizzo richiesto non valido nel proprio contesto" but other messages like "Socket Closed" remain "Socket Closed".
Catch the exact exception through description is not a good idea but I don't found other way for Java SE native exceptions!
In Solaris I try to set English LANG environment in the user context and it works.
In MS Windows I try to set the definition in start java with:
*"java -Duser.language=en -Duser.region=US"*
and in the code I try to add the statement:
Locale.setDefault(Locale.US);
but without results.
Is there anybody that has the same problem?
Is there a better way to catch the exact type of Java SE exceptions ?
My test Environments:_
Solaris 10 jdk 1.6.0.02
MS Windows 2000 jdk 1.6.0.02
MS Windows XP jdk1.6.0.02 and 1.5.0.12
Fragment program example for additional explanation:_
try {
} catch (IOException ex) {
if (ex.getMessage().equals("Socket Closed"))
System.out.println("Ok socket closed exception catched");
if (ex.getMessage().equals("Cannot assign requested address"))
System.out.println("Ok assign requested address exception catched");
}

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Also I am working on Linux for the first time and I noticed that when i gave a couple of System.outs in the code to find out what was happening, they appeared allright in windows, but did not appear in Linux !! (then even the exception below disappeared, and that did not load help either !!)
java.lang.NullPointerException
at javax.help.HelpSet.parseInto(HelpSet.java:567)
at javax.help.HelpSet.<init>(HelpSet.java:129)
at com.mysoftware.util.MyJavaHelp.<init>(MyJavaHelp.java:52)
at com.mysoftware.util.MyJavaHelp.getInstance(MyJavaHelp.java:64)
Parsing failed for null
Got an IOException (null)
An answer to this will be highly appreciated...

At present I am not sure if I can post code. I am trying to find that out. However, can u tell me what u mean by a Windows - window? I will try to figure that out...
Thanks a lot..

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Hi
still new to ODI
I have created a java beanshell script in ODI which calls a simple java class, cars, then sets the no of seats to a value designed to raise an exception. Exception raised but procedure works OK,
How can I register the fact that it has failed through exception handling? (It is possible that my java exception handling isn't quite right)
The no of seats has no effect on the success/failure of the ODI procedure, but the log shows that the exception is caught !
any assistance gratefully received.
Regards
Terry
cars class: (added to agent start)
====================
public class cars {
private int seats;
public void setSeats (int seats) throws tooManySeatsException {
if (seats) < 100) {
this .seats = seats;
} else {
throw new tooManySeatsException("Too many seats");
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class tooManySeatsException extends Exception {
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super();
Java beanshell procedure in ODI
====================
import cars;
public class carsTest {
public carsTest(){
public void init(){
cars c = new cars();
c.setSeats(20);
//c.setseats(200);
try {
carsTest ct = new carsTest();
ct.init();
} catch (Exception e) {
throw Error (e);
}

Your code throws exception when you set value >100 but you are setting 20 thus it would not throw exception.
In the procedure step you can uncheck "Ignore error" flag to let execution failed on throwing any exception from your code. If you check that flag then the execution would not fail rather lease the task in warning state.

Exception Handling in Java .. Help

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