Catch String Exception
I want the user only to put in the string"n" and catch any other errors. If the the user enters the string "n", the screen will print "i". In this case, what should i put for the catch statement?
that's what i did:
try {
System.out.println("Enter n");
Scanner input = new Scanner (System.in);
String word = input.nextLine();
catch (Exception e){
System.out.println("");
System.out.println("i");
First off, where you have the print of the letter 'i' will happen whether or not an exception is caught, which is probably not what you want.
Second, the code in your catch block will not be executed currently if the user types something other than 'n'. In your try block you got to test the input and if it is bad, you need to throw an exception.
Note to teachers, i will find you and slap you silly for given students bad example problems like this.
Similar Messages
-
Why do I need to catch this exception?
Hello all
This is a question about exception handling. I have to build a diary application that lets you save reminders on particular dates using xml. Just to make it a little tougher, I was not allowed to use the Calendar class. This is the code I wrote:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
import java.text.*;
import javax.xml.parsers.*;
import org.xml.sax.*;
import java.io.*;
import org.w3c.dom.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;
import static java.lang.Math.*;
public class CalendarAssignment extends JFrame implements ActionListener
int MonthLength [] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
public JButton [] days = new JButton[43];
private JLabel lbl, reminderlbl;
private JPanel top, grid, remindercenter, reminderbottom;
private JFrame reminderframe;
private JTextField year1, reminderinput, dayno;
private JComboBox months;
private Container container;
private JButton fetch, save, cancel;
private Document doc;
private File file;
private Node node;
private String year, month, day;
public static void main( String[] args ) {
CalendarAssignment c = new CalendarAssignment( );
c.setSize( 400, 300 );
c.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
c.show( );
public CalendarAssignment( ) {
int CurrentYear, CurrentMonth;
String YearString, MonthString, Now;
Date today;
container = getContentPane( );
container.setLayout( new BorderLayout( ) );
SimpleDateFormat DateFormatter;
DateFormatter = new SimpleDateFormat( "MM.yyyy" );
today = new Date( );
Now = DateFormatter.format( today );
MonthString = Now.substring( 0,2 );
YearString = Now.substring( 3,7 );
CurrentMonth = Integer.valueOf( MonthString );
CurrentYear = Integer.valueOf( YearString );
top = new JPanel( );
String [] items = { "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November",
"December" };
months = new JComboBox( items );
months.setEditable( false );
months.setSelectedIndex( CurrentMonth - 1 );
year1 = new JTextField( );
year1.setText( YearString );
year1.setEditable( true );
year1.setHorizontalAlignment( year1.CENTER );
fetch = new JButton( "Fetch Month" );
fetch.addActionListener( this );
top.setLayout( new GridLayout( 1, 3, 20, 0 ) );
top.add( months );
top.add( year1 );
top.add( fetch );
grid = new JPanel( );
grid.setLayout( new GridLayout( 7, 7, 0, 0 ) );
String [] week = { "Mon", "Tue", "Wed", "Thur", "Fri", "Sat", "Sun" };
for ( int a = 0; a < 7; a ++ ) {
JLabel lbl = new JLabel( week[a], JLabel.CENTER );
grid.add( lbl );
for ( int i = 0; i < 42; i ++ ) {
days[i] = new JButton( );
grid.add( days[i] );
days.addActionListener( this );
DrawCalendar( CurrentMonth, CurrentYear );
container.add( top, BorderLayout.NORTH );
container.add( grid, BorderLayout.CENTER );
private void DrawCalendar( int SelectMonth, int SelectYear ) {
int DisplayMonthLength, Buttons;
String ButtonID = "";
int OffSet = MonthStart( SelectMonth, SelectYear );
DisplayMonthLength = MonthLength [SelectMonth - 1];
if ( SelectMonth == 2 )
DisplayMonthLength += LeapYear( SelectYear );
for ( Buttons = 1; Buttons < 43; Buttons ++ ) {
if ( ( Buttons <= OffSet ) || ( Buttons > ( DisplayMonthLength + OffSet ) ) ) {
ButtonID = "";
days[Buttons-1].setEnabled( false );
else {
ButtonID = Integer.toString( Buttons - OffSet );
days[Buttons-1].setEnabled( true );
days[Buttons-1].setLabel( ButtonID );
grid.add( days[Buttons-1] );
private int LeapYear( int year ) {
int FourHundred, OneHundred, Fourth;
FourHundred = year % 400;
OneHundred = year % 100;
Fourth = year % 4;
if( ( ( FourHundred == 0 ) ) || ( ( OneHundred != 0 ) && ( Fourth == 0 ) ) )
return ( 1 );
else
return ( 0 );
private int MonthStart( int Month, int Year ) {
int OffSet, LastMonths, BeforeOrAfter, Years;
int AllDays = 0;
int YearDays = 365;
int YearMonths = 12;
BeforeOrAfter = Year - 2006;
Years = abs( BeforeOrAfter );
if( BeforeOrAfter != 0 )
BeforeOrAfter = BeforeOrAfter / Years;
switch( BeforeOrAfter ) {
case 1:
for( int a = 2006; a < Year; a ++ ) {
AllDays += YearDays + LeapYear( a );
AllDays += LastMonthsCalc( Month, Year );
break;
case -1:
for( int a = 2005; a > Year; a -- ) {
AllDays += YearDays + LeapYear( a );
for( LastMonths = YearMonths; LastMonths >= Month; LastMonths -- ) {
AllDays += MonthLength[LastMonths - 1];
if( LastMonths == 2 )
AllDays += LeapYear( Year );
break;
default:
if( Month > 1 )
AllDays += ( LastMonthsCalc( Month, Year ) );
OffSet = AllDays % 7;
if( BeforeOrAfter ==( -1 ) )
return( 6 - OffSet );
else if( OffSet > 0 )
return( OffSet - 1 );
else
return( 6 );
private int LastMonthsCalc( int Month, int Year ) {
int Counter;
int days = 0;
for( Counter = 1; Counter < Month; Counter ++ ) {
days += MonthLength[Counter - 1];
if( Counter == 2 )
days += LeapYear( Year );
return( days );
public void CreateReminder( String buttonID, String yearID, String monthID ) {
reminderframe = new JFrame( );
reminderlbl = new JLabel( );
reminderframe.setLayout( new GridLayout( 2, 1, 0, 0 ) );
remindercenter = new JPanel( );
reminderlbl = new JLabel( "Please type in reminder to be saved for " + buttonID + " " + monthID + " " + yearID + ":", JLabel.CENTER );
reminderinput = new JTextField( 30 );
reminderinput.setHorizontalAlignment( reminderinput.CENTER );
reminderinput.setEditable( true );
remindercenter.setLayout( new GridLayout( 2, 1, 0, 0 ) );
remindercenter.add( reminderlbl );
remindercenter.add( reminderinput );
reminderbottom = new JPanel( );
save = new JButton( "Save" );
save.addActionListener( this );
cancel = new JButton( "Cancel" );
cancel.addActionListener( this );
dayno = new JTextField( buttonID );
dayno.setEditable( false );
dayno.setEnabled( false );
dayno.show( false );
reminderbottom.setLayout( new FlowLayout( ) );
reminderbottom.add( save );
reminderbottom.add( cancel );
reminderbottom.add( dayno );
reminderframe.setSize( 500, 75 );
reminderframe.add( remindercenter );
reminderframe.add( reminderbottom );
reminderframe.pack( );
reminderframe.show( );
public void SaveReminder( String dayID, String yearID, String monthID ) throws Exception {
file = new File( "Diary.xml" );
doc = DocumentBuilderFactory.newInstance( ).newDocumentBuilder( ).parse( file.toURL( ).toString( ) );
String year = yearID;
String month = monthID;
String day = dayID;
//System.out.println( year );
//System.out.println( month );
//System.out.println( day );
CreateEntry( doc.getDocumentElement( ) );
writeXmlFile( );
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", year );
node = searchNode;
searchNode = getMonth( node );
if( searchNode == null ) {
Element newNode = doc.createElement( "Month" );
searchNode = node.appendChild( newNode );
newNode.setAttribute( "Id", month );
node = searchNode;
searchNode = getDay( node );
if( searchNode == null ) {
Element newNode = doc.createElement( "Day" );
searchNode = node.appendChild( newNode );
newNode.setAttribute( "Id", day );
node = searchNode;
String entry = reminderinput.getText( );
Node textNode = doc.createTextNode( entry );
node.appendChild( textNode );
return true;
private Node getYear( Node node ) {
node = node.getFirstChild( );
while( node != null ) {
if(node.getNodeName( ).equals( "Year" ) && String.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" ) && String.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" ) && String.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 );
public void actionPerformed( ActionEvent e ) {
String IDButton = e.getActionCommand( );
String IDYear = year1.getText( );
Object IDMonthObj = months.getSelectedItem( );
if( e.getSource( ) == fetch ) {
String YearText = year1.getText( );
int YearNumber = Integer.valueOf( YearText );
int MonthsIndex = months.getSelectedIndex( ) + 1;
DrawCalendar( MonthsIndex, YearNumber );
else if( e.getSource( ) == cancel ) {
reminderframe.hide( );
else if( e.getSource( ) == save ) {
String IDDay = dayno.getText( );
String IDMonth = String.valueOf( IDMonthObj );
SaveReminder( IDDay, IDYear, IDMonth );
else {
String IDMonth = String.valueOf( IDMonthObj );
Toolkit.getDefaultToolkit( ).beep( );
int n = JOptionPane.showConfirmDialog( null, "Set reminder on this date?", "Question", JOptionPane.YES_NO_OPTION );
if( n == JOptionPane.YES_OPTION ) {
CreateReminder( IDButton, IDYear, IDMonth );
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. -
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 xI 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. -
How can I catch the exception type c = type i?
How can I catch the exception and display the error message when I assign the u2018ABC123u2019 value to an int data type.
Code is as follow.
REPORT zfsl_sum_functions.
DATA: cin(50),
cout(50),
iin TYPE i,
iout TYPE i,
etext TYPE string.
cin = '123ABC'. " how can i catch this
iout = cin.
WRITE: iout.The CATCH-ENDCATCH statement is obsolete as of release was620. You should use TRY. CATCH. ENDCATCH.
The exception that will be raise is CX_SY_CONVERSION_NO_NUMBER, so you have to catch that exception or a super class of this exception class.
REPORT zfsl_sum_functions.
DATA: cin(50),
cout(50),
iin TYPE i,
iout TYPE i,
etext TYPE string.
DATA: rf_cx_error TYPE REF TO CX_SY_CONVERSION_NO_NUMBER,
errortxt TYPE string.
TRY.
cin = '123ABC'. " how can i catch this
iout = cin.
WRITE: iout.
CATCH CX_SY_CONVERSION_NO_NUMBER INTO rf_cx_error.
errortxt = rf_cx_error->get_text( ).
WRITE errortxt.
ENDTRY. -
Can i catch an exception from another thread?
hi,guys,i have some code like this:
public static void main(String[] args) {
TimeoutThread time = new TimeoutThread(100,new TimeOutException("超时"));
try{
t.start();
}catch(Exception e){
System.out.println("eeeeeeeeeee");
TimeoutThread will throws an exception when it runs ,but now i can't get "eeeeeeeeeee" from my console when i runs the main bolck code.
i asked this question in concurrent forums,somebody told me that i can't.so ,i think if i can do this from aspect of jvm.
thank you for your help
Edited by: Darryl Burke -- Double post of how to catching exceptions from another thread lockinguser5449747 wrote:
so ,i think if i can do this from aspect of jvm. What does that mean? You think you'll get a different answer in a different forum?
You can't catch exceptions from another thread. It's that easy. You could somehow ensure that exceptions from that other thread are always caught and somehow passed to your thread, but that would be a different thing (you would still be catching the exception on the thread it is originating from, as is the only way).
For example you can use setUncaughtExceptionHandler() on your thread to provide an object that handles an uncaught exceptions (and you could pass that uncaught exception to your other thread in some way). -
How to throw or catch sql exception for executeReader sql adapter
Wcf sql adapter was created and executeReader was used.
When an invalid sql statement was constructed and send it to wcf sql adapter, it will hanging there, and no response. No exception was catched even though send chape was inside a catch block. How can I catch this kind of exception
or throw this exception ? I need to give client an exception resposne.
thanks
GaryI used scope with exception handle which has Exception object type: "System.SystemException".
I guess this type "System.SystemException" can catch any exception, including sql exception. Maybe I am wrong. I got error from window event:
A message sent to adapter "WCF-Custom" on send port "WcfSendPort_SqlAdapterBinding_DalCore_Custom" with URI "mssql://shig-quad-2k3e1//DataSourceOne?" is suspended.
Error details: System.Data.SqlClient.SqlException: Incorrect syntax near '='.
Server stack trace:
at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result)
at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
at System.ServiceModel.Channels.ServiceChannel.EndRequest(IAsyncResult result)
Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at System.ServiceModel.Channels.IRequestChannel.EndRequest(IAsyncResult result)
at Microsoft.BizTalk.Adapter.Wcf.Runtime.WcfClient`2.RequestCallback(IAsyncResult result)
MessageId: {B24EF5B8-298A-4D4F-AA98-5E639361A7DB}
InstanceID: {F8924129-265B-4652-B20E-8D25F8F20A51}
If "System.SystemException" can't catch all exception, which type can catch all exception ? I want to catch all exception in this catch block.
thanks
Gary -
Bug? EJB method Return Value and Client Catch the Exception?
oc4j 9.0.3 on the windows 2000
I write a Stateless Session Bean named SB1 ,
and define application exception.
The Code as follow:
public class AppErrorException extends Exception
public interface SB1 extends EJBObject
public String getMemono(String sysID, String rptKind, String parentMemono)
throws RemoteException, AppErrorException;
public class SB1Bean implements SessionBean
public String getMemono(String sysID, String rptKind, String parentMemono)
throws RemoteException, AppErrorException
throw new AppErrorException("Error in getMemono");
public class SB1TestClient
try
memomo= sb1.getMemono(.....);
catch(AppErrorException ae)
ae.printStackTrace();
I found a bug.
If SB1.getMemono() throws the AppErrorException, but SB1TestClient will not catch any Exception.
It is not normal!!!!
[cf]
But If I convert "public String getMemono(...)" into "public void getMemono(...)",
When SB1.getMemono() throws the AppErrorException, but SB1TestClient will catch any Exception.
It is normal.getMemono(.......)'s code as follow:
public String getMemono(String sysID, String rptKind, String parentMemono)
throws AppErrorException
log("getMemono("+sysID+", "+rptKind+", "+parentMemono+")");
Connection connection= null;
CallableStatement statement = null;
String memono= "";
short retCode= -1;
String retMsg= "";
try
String sql= this.CALL_SPGETMEMONO;
connection = ResourceAssistant.getDBConnectionLocal("awmsDS");
statement= connection.prepareCall(sql);
statement.setString(1, sysID.trim());
statement.setString(2, rptKind.trim());
statement.setString(3, parentMemono.trim());
statement.registerOutParameter(4, java.sql.Types.VARCHAR);
statement.registerOutParameter(5, java.sql.Types.SMALLINT);
statement.registerOutParameter(6, java.sql.Types.VARCHAR);
statement.executeQuery();
retCode= statement.getShort(5);
retMsg= statement.getString(6);
log("retCode="+retCode);
log("retMsg="+retMsg);
if (retCode==AppConfig.SHORT_SP_RETCODE_FAILED)
log("retCode==AppConfig.SHORT_SP_RETCODE_FAILED");
this.sessionContext.setRollbackOnly();
throw new AppErrorException(retMsg);
memono= statement.getString(4);
log("memono="+memono);
if (rptKind.trim().length()<6)
log("rptKind.trim().length()<6");
this.sessionContext.setRollbackOnly();
throw new AppErrorException("rptKind.trim().length()<6");
memono= "SS";
catch (AppErrorException ae)
log("catch(AppErrorException ae)");
throw ae;
//throw new EJBException(ae.getErrMsg());
catch (Exception e)
log("catch (Exception e)");
this.sessionContext.setRollbackOnly();
throw new AppErrorException(IExceptionConst.ERR_MSG_SYSMEMONO_00000, e.toString());
//throw new EJBException(IExceptionConst.ERR_MSG_SYSMEMONO_00000+", "+e.toString());
finally
log("this.sessionContext.getRollbackOnly()="+this.sessionContext.getRollbackOnly());
ResourceAssistant.cleanup(connection,statement);
return memono; -
Centralized way of catching unexpected Exceptions in Java?
Hi Guys,
Is there a centralized way to catch unexpected Exceptions in Java?
Here's an example:
public static void main(String[] args)
try
new Thread()
public void run()
String s = null;
//NullPointerException is thrown here
s.indexOf(12);
}.start();
catch (Exception ex)
System.err.println("This is not called");
ex.printStackTrace();
}Think about a program error, that the program is not prepared for, i.e. NullPointerException or an ArrayIndexOutOfBounds exception.
What I'm after is not like "put critical block in try-catch", but something like registering a global ExceptionListener in java.lang.Runtime, a monitoring MBean or something that I could use in my program to do a simple exception logging.
Any idea, help would be greatly appreciated!
peterNullPointerException , IOException ....all are subclasses of the base class Exception, so catch(Exception) will catch any exception in the current thread. So modify ur code a bit
public static void main(String[] args)
new Thread()
public void run()
try{
String s = null;
//NullPointerException is thrown here
s.indexOf(12);
catch (Exception ex)
System.err.println("This is not called");
ex.printStackTrace();
}.start();
..... -
I am having problems catching an exception I made
I made an exception, but my program won't catch it.
import java.io.*;
import java.util.Scanner;
public class Driver {
public static void main(String [] args){
String input;
InputStream yourfile;
Scanner file;
Scanner scan = new Scanner (System.in);
System.out.println("Enter the file you want to view:");
input = scan.next();
yourfile = Driver.class.getResourceAsStream(input);
file = new Scanner(yourfile);
System.out.println("Designation Code Report Number Title");
input = file.nextLine();
try{
do{
input = file.nextLine();
if ((input.charAt(0)=='U')){
System.out.println("Unclassified "+ input);
else
if ((input.charAt(0)=='C')){
System.out.println("Confidential "+ input);
else
if ((input.charAt(0)=='P')){
System.out.println("Proprietary "+ input);
}while(file.hasNext()==true);
}catch(InvalidDocumentCodeException exception){
System.out.println("LOSE");
}My exception code:
public class InvalidDocumentCodeException extends Exception {
public InvalidDocumentCodeException(String message) {
super(message);
}That was a brain fart of a mistake. I put the throw in there, but it says that it's undefined.
import java.io.*;
import java.util.Scanner;
public class Driver {
public static void main(String [] args){
String input;
InputStream yourfile;
Scanner file;
Scanner scan = new Scanner (System.in);
System.out.println("Enter the file you want to view:");
input = scan.next();
yourfile = Driver.class.getResourceAsStream(input);
file = new Scanner(yourfile);
System.out.println("Designation Code Report Number Title");
input = file.nextLine();
try{
do{
input = file.nextLine();
if ((input.charAt(0)=='U')){
System.out.println("Unclassified "+ input);
else
if ((input.charAt(0)=='C')){
System.out.println("Confidential "+ input);
else
if ((input.charAt(0)=='P')){
System.out.println("Proprietary "+ input);
else
throw InvalidDocumentCodeException("Exception!");
}while(file.hasNext()==true);
}catch(InvalidDocumentCodeException exception){
System.out.println("LOSE");
} -
A catch-all "exception handler" - what's the end of an stack trace?
I've created an application that is beeing tested these days, and I thought it would be a good idea to implement a "catch-all" exception handler so that I could notify the user when an exception occur (so that he may stop, send me the log, and to prevent errors that occur as a result of the first one).
The way I've started implementing it is I redirect error out to a custom output stream:
public class ConsoleOutStream extends ByteArrayOutputStream {
private JFrame owner;
public ConsoleOutStream(JFrame owner) {
this.owner = owner;
* Writes <code>len</code> bytes from the specified byte array
* starting at offset <code>off</code> to this byte array output stream.
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
public synchronized void write(byte b[], int off, int len) {
super.write(b, off, len);
checkForExceptions();
* Writes the specified byte to this byte array output stream.
* @param b the byte to be written.
public synchronized void write(int b) {
super.write(b);
checkForExceptions();
private void checkForExceptions() {
reset();
if(this.toString().indexOf("xception") != -1) {
System.out.println("Exception!!\n\n");
System.out.println(this.toString());
}then i redirect System.err:
PrintStream out = new PrintStream(new ConsoleOutStream(this));
System.setErr(out);
The problem is that the checkForExceptions() method will be called, e.g. 3 times for each exception - and I just want to display an error message to the user once (of course).
Anyone done something similar?I'm interested in catching all "unhandled errors"how about:
public static void main(String[] args){
try{
//whatever you would normally call from main
}catch (Throwable e){
System.out.println("There was an unhandled exception:");
e.printStackTrace();
} -
Can't catch the exception when transaction rollback ,BPEL/SOA 11G,updated!
Hi Guys ,
I have two insert/update invoke actions through dbadpter in my BPEL process .
When I set the GetActiveUnitOfWork property of those two db adapters to true ,it successfully makes the global transaction work . any of them failed will cause the other rollback.
But the CatchAll brunch can't catch the exception in that case,
I can only see exception message from the system output :
02/11/2009 11:36:46 AM oracle.toplink.transaction.AbstractSynchronizationListener beforeCompletion
WARNING:
Local Exception Stack:
Exception [TOPLINK-4002] (Oracle TopLink - 11g Release 1 (11.1.1.1.0) (Build 090527)): oracle.toplink.exceptions.DatabaseException
Internal Exception: java.sql.SQLIntegrityConstraintViolationException: ORA-00001: unique constraint (Table1_PK) violated
from BPEL console , you can't even see the error , the process finished with no exception.
When I set GetActiveUnitOfWork to false, CatchAll brunch is able to catch the exception , but global rollback is not working .
I try all the other method like set the transaction property of BPEL to required , using checkpoint() in java embedding . it looks like only way is set GetActiveUnitOfWork to true, but can't catch exception.
Here are some updated:
Here is my process
Main Sequence
Invoke (dbadapter update)
Invoke (dbadapter insert)
Global CatchAll
Invoke(jmsAdapter sendjms)
if I disable the CatchAll branch , when insert failed , the insert will rollback as well, even GetActiveUnitOfWork set to false.
enable CatchAll branch , even doing nothing in this branch , the update won't rollback when insert failed. it looks like when catch the exception , bpel seems not rollback , I try to add throw rollback in catchall branch, no any effect.
any clue ?
Kevin
Edited by: kyi on Nov 5, 2009 10:10 AMHi All,
We are also facing a similar kind of issue.
We have a simple BPEL which will makes use of JAva embedding to call an end point to check its availibility.
The Java code for cheking the enpoint connectivity is below
try{
boolean endpointAvailable = false;
long start = System.currentTimeMillis();
int endpointTestURL_port = 8445 ;
int endpointTestURL_timeout = 500;
String endpointTestURL_queryString = "" ;
String endpointTestURL_protocol = (String)getVariableData ("endpointProtocol");
addAuditTrailEntry("endpointTestURL_protocol: " + endpointTestURL_protocol);
String endpointTestURL_host = (String)getVariableData ("endpointHost");
addAuditTrailEntry("endpointTestURL_hostl: " + endpointTestURL_host);
URL endpoint = new URL(endpointTestURL_protocol, endpointTestURL_host, 8445, endpointTestURL_queryString);
addAuditTrailEntry("endpoint object is created" );
String endpointTestURL = endpoint.toExternalForm();
addAuditTrailEntry("Checking availability of endpoint at URL: " + endpointTestURL);
// Configure connection
HttpURLConnection connection = (HttpURLConnection)endpoint.openConnection();
connection.setRequestMethod("GET");
addAuditTrailEntry("The Method is Get");
connection.setConnectTimeout(5000);
addAuditTrailEntry("Timeout is 500 ms");
// Open connection
connection.connect();
addAuditTrailEntry("Open Connection");
String responseMessage = connection.getResponseMessage();
addAuditTrailEntry("Recieved availability response from endpoint as: " + responseMessage);
// Close connection
connection.disconnect();
endpointAvailable = true;
if (endpointAvailable)
setVariableData("crmIsAvailable", "true");
else
setVariableData("crmIsAvailable", "false");
catch(Exception e)
System.out.println ("Error in checking endpoint availability " + e) ;
addAuditTrailEntry("error message is : " +e);
When we run the above as a seperate java program it runs fine i.e goes to the catch block and catches the exception.
But when we run it within the java embedding in BPEL(11G) it gives us the follwoing error.
The reason was The execution of this instance "490001" for process "default/GMDSSalesLeadsBackMediationInterface!1.0*soa_e1a6362f-c148-417c-819c-9327017ebfa4" is supposed to be in an active jta transaction, the current transaction status is "ROLLEDBACK" .
Consult the system administrator regarding this error.
at com.oracle.bpel.client.util.TransactionUtils.throwExceptionIfTxnNotActive(TransactionUtils.java:119)
at com.collaxa.cube.engine.CubeEngine.store(CubeEngine.java:4055)
at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:4372)
at com.collaxa.cube.engine.CubeEngine.endRequest(CubeEngine.java:4281)
at com.collaxa.cube.engine.CubeEngine._createAndInvoke(CubeEngine.java:713)
at com.collaxa.cube.engine.CubeEngine.createAndInvoke(CubeEngine.java:545)
at com.collaxa.cube.engine.delivery.DeliveryService.handleInvoke(DeliveryService.java:654)
at com.collaxa.cube.engine.ejb.impl.CubeDeliveryBean.handleInvoke(CubeDeliveryBean.java:355)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at com.bea.core.repackaged.springframework.jee.intercept.MethodInvocationInvocationContext.proceed(MethodInvocationInvocationContext.java:104)
at oracle.security.jps.ee.ejb.JpsAbsInterceptor$1.run(JpsAbsInterceptor.java:88)
at oracle.security.jps.util.JpsSubject.doAsPrivileged(JpsSubject.java:313)
at oracle.security.jps.ee.util.JpsPlatformUtil.runJaasMode(JpsPlatformUtil.java:414)
at oracle.security.jps.wls.JpsWeblogicEjbInterceptor.runJaasMode(JpsWeblogicEjbInterceptor.java:61)
at oracle.security.jps.ee.ejb.JpsAbsInterceptor.intercept(JpsAbsInterceptor.java:106)
at oracle.security.jps.ee.ejb.JpsInterceptor.intercept(JpsInterceptor.java:106)
at sun.reflect.GeneratedMethodAccessor960.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.bea.core.repackaged.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:310)
at com.bea.core.repackaged.springframework.jee.intercept.JeeInterceptorInterceptor.invoke(JeeInterceptorInterceptor.java:69)
at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)
at com.bea.core.repackaged.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)
at com.bea.core.repackaged.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at com.bea.core.repackaged.springframework.jee.spi.MethodInvocationVisitorImpl.visit(MethodInvocationVisitorImpl.java:37)
at weblogic.ejb.container.injection.EnvironmentInte
we also get
BEA1-108EA2A88DAF381957FF
weblogic.transaction.internal.TimedOutException: Transaction timed out after 301 seconds
BEA1-108EA2A88DAF381957FF
at weblogic.transaction.internal.ServerTransactionImpl.wakeUp(ServerTransactionImpl.java:1733)
at weblogic.transaction.internal.ServerTransactionManagerImpl.processTimedOutTransactions(ServerTransactionManagerImpl.java:1578)
at weblogic.transaction.internal.TransactionManagerImpl.wakeUp(TransactionManagerImpl.java:1900)
at weblogic.transaction.internal.ServerTransactionManagerImpl.wakeUp(ServerTransactionManagerImpl.java:1488)
at weblogic.transaction.internal.WLSTimer.timerExpired(WLSTimer.java:35)
at weblogic.timers.internal.TimerImpl.run(TimerImpl.java:273)
at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:528)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:201)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:173)
javax.ejb.EJBException: Transaction Rolledback.: weblogic.transaction.internal.TimedOutException: Transaction timed out after 301 seconds
BEA1-108EA2A88DAF381957FF
We tried the following
Increase the JTA timeout in the EM console to a larger value like 600 secs.
The BPEL instance is not getting created.
Any help would be appreciated
Thanks
Lalit -
I have a getter method which is called from a "main" method in my class. This "main" method controls the functionality in my class. The getter method calls another method which can throw an exception.
Should I catch the exception and exit the program from the getter method or let this exception bubble through the getter method and be handeled by the "main" method?Or like this?
public class test {
private void doEverthing(){
String string = getMyArrayList();
private String getMyArrayList(){
try {
String string = methodWhichThrowsException();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return new String();
private String methodWhichThrowsException() throws Exception{
throw new Exception("aaa");
public static void main(String[] args) {
test t = new test();
t.doEverthing();
} -
Is it good practice to catch High level Exception in the try block, this would also catch RuntimeException. My personal opinion is not to catch the Runtime Exception and let the JVM handle it. However if there is a need to catch specific Runtime Exception, code should be written for that.
try
// Your code
catch (Exception e)
e.printStackTrace()
}I agree that runtime exceptions should generally not
be caught as they are mistakes of programmers.
But in order to debug a large project with hundreds of
classes it can be useful to do that anyways.
Any my big question is: how?
I tried to wrap the content of the main method in a
try / catch block hoping that I could catch all
exceptions not handled somewhere else.
But it didn't work.
I manually threw some exceptions somewhere in my GUI
and the main method wrapper didn't get them.
But the VM did and printed the exception message.
But I didn't want the VM to catch my exceptions. I
wanted to catch them myself at the lowest possible
point in my own classes.
And I thought that was the main method.
Can anyone help me?
Thank you
Matthias Klein
P.S. please excuse my improvable english; it's not my
mother tongue.AWT uses many different threads in your program that you never find out about unless something breaks. main(String arg[]) starts as the lowest possible point but, if you construct a Frame, Image, or certain other objects from the AWT package, AWT Threads automatically start over which you have little or no control.
Overall, I don't think it's actually possible to catch the Runtime Exceptions out of these Threads. The best this you can do about them is prevent them from happening. -
Not able to catch the exception
Hi,
I'm trying to run an ADF page (Test.jspx) . The only page content I have is an embedded BI report.
I have used a report executable in my page definition.
A sample code snippet is:
<executables>
<biContent id="biExecBinding1" connectionId="TMBIPresentationServerConn" path="/shared/TMSharedFolders/MOT_SalesAccount" type="biReportContent" xmlns="http://xmlns.oracle.com/bi/report/bindings">
</executables>
Here TMBIPresentationServerConn is the name of the connection of the BI Server.
If BI Server is down, on running my page , an exception is being thrown by the framework.
I want to catch this exception and perform my own logic, but since i am using a binding context for report , i am not able to catch this exception.
Could you please let me know how can i catch the exception if BI is down?
Thanks
Nutan(as I suspected from your first post)
You are using a version of JDeveloper that isn't available to the general public, and are asking about it on a public forum. You should use the internal Oracle forum - I don't know the URL, because I am one of the unwashed general public ;)
John
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