HelloWorldApp throws Exception in Main

Hi folks,
Can some one help me to get this working. It compiles fine but when i run using the
java HelloWorldApp
it throws this error
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp
the program i am trying to run is
class HelloWorldApp {
public static void main(String[] args) {
System.out.println("Hello World!"); //Display the string.
Thanks
pavan

Perhaps:
mkdir c:\java\classes
javac -d c:\java\classes YourClass.java
That'll put the output classes in the classes directory, which is cleaner anyway, rather than keeping them with your source.
Then set your classpath to include c:\java\classes

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Throws Exception in main and return code for JVM

Hello,
Could someone tell me what the following statement :
public class Foo {
public static void main(java.lang.String[] args) throws Exception {
// Some source code
is supposed to do with the return code of the VM when the Exception is thrown.
I mean what num�ric value is supposed to return the following instruction :
java -classpath ... com.app.Foo
Because my Java program is run in a script shell which is supposed to get a return code which as to be interpreted.
Off course I am not allowed to do the test myself because this script shell is executed on a production server ...

I don't know what the return code will be, but you could do this:
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try
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Why throw exception in main thread

A very simple example
public class ExceptionTest {
public static void main(String[] args) throws StupidException {
   int i = 0;
   if (i == 0)
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public class StupidException {
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Umm, one of us is missing something here. My only question is "What are you surprised about?" You have the line
throw new StupidException();and you don't catch that exception anywhere, so of course the program is going to exit that way. You explicitly told main to throw an exception and it did it.
Sorry, not trying to sound snotty or anything. I guess I still just don't know what you're asking.
>
class ExceptionTest {
public static void main(String[] args) throws
StupidException {
int i = 0;
if (i == 0)
throw new StupidException();
class StupidException extends Exception {
public StupidException() {
System.out.println("Da. This is a stupid
d exception!");
}The error that occurs during runtime, along with
expected output, is the following:
Da. This is a stupid exception!
StupidException
at ExceptionTest.main(ExceptionTest.java:7)
Exception in thread "main"
Process completed.
Okay. Now the question again will be "Why is this
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method to throw an IOException. This is a common
throwable.It's possible for main to throw any throwable you tell it to.
>
It is true that a try/catch can handle this. But then
again creating an exception package for a full
application makes could use of the write once/use
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>
Anyone able to naildown the conflict with the runtime
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Using sql bulk copy throwing exception -The given value of type String from the data source cannot be converted to type int of the specified target column

Hi All,
I am reading notepads files and inserting data in sql tables from the notepad-
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sudhanshu sharma Do good and cast it into river :)

Hi,
I think you'll have to do an explicit column mapping if they are not in exact sequence in both source and destination.
Have a look at this link:
https://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlbulkcopycolumnmapping(v=vs.110).aspx
Good Luck!
Kaur.
Please mark as answer if this resolves your issue.

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Read the error messages and pay attention to the line number of the error:
1)1 import java.io.*;
2
3 public class Test
4 {
5   public static void openFile()
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7     FileOutputStream f = new FileOutputStream("data.txt");
8   }
9
10   public static void main (String[] args)
11   {
12     openFile();
13   }
14 }
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Test.java:7: unreported exception java.io.FileNotFoundException; must be caught or declared to be thrown
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1 error2)1 import java.io.*;
2
3 public class Test
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9
10   public static void main (String[] args)
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1 error3)
1 import java.io.*;
2
3 public class Test
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10   public static void main (String[] args)
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17     {
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20   }
21 }
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$
1 import java.io.*;
2
3 public class Test
4 {
5   public static void openFile() throws FileNotFoundException
6   {
7     FileOutputStream f = new FileOutputStream("data.txt");
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9
10   public static void main (String[] args) throws FileNotFoundException
11   {
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14 }
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$

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Clients of your class might not like you throwing
exceptions from the ctor. If they're checked
exceptions it'll mean try/catch blocks. If there are
LOTS of checked exceptions that'll mean lots of catch
blocks. Could get messy fast. You could catch in the
ctor and wrap in a subclass of
java.lang.RuntimeException. Those are unchecked, like
java.lang.IllegalArgumentException.I would strongly advise against making your checked exceptions unchecked just so that the caller's code will compile without try/catch blocks. Either way--checked or unchecked--if I do Foo foo = new Foo();
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@%: I know you're aware of the proper use of checked/unchecked exceptions, but the way you worded you post kind of sounded like you were saying, "just use unchecked if you find the caller has too many try statements."
¶

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Hi,
I'm having a problem trying to throw an error inside a try block.
To illustrate:
public class TestException {
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try {
int ret = foo();
System.out.println("ret is " + ret);
} catch (Exception ex) {
System.out.println("exception caught");
public int foo() throws Exception {
int ret = 0;
try {
throw new Exception("test exception");
} finally {
return ret;
public static void main(String[] args) {
new TestException();
If I run this the only output is "ret is 0" - I do not catch the thrown exception! What am I doing wrong?
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public class SubException1 extends SuperException {...}
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at at.dms.kjc.Main.run(Unknown Source)
at at.dms.kjc.Main.main(Unknown Source)
at ca.ubc.cs.jex.Jex.main(Unknown Source)
Can you tell me why?
Otherwise, I received jex-files, in which no exception is appeared. When should exceptions be returned in jex file?

How to throw exception..?

class A
void execute() throws Exception
int i=10/0;
public static void main(String args[])
try
new A().execute();
catch(Exception e)
System.out.println(e);
(or)
class A
void execute() throws Exception
try
int i=10/0;
catch(Exception e)
throw e;
public static void main(String args[])
try
new A().execute();
catch(Exception e)
System.out.println(e);
}hi i want to knw which form of throwing of exception is best from the above two program... and also tell me the reason pls... can anyone give the solution.....

There are two general classes of exceptions in java, often called checked and unchecked.
The exception thrown by zero divide, in your example, is a RuntimeException and doesn't require a throws clause.
Most exceptions are throw with a throw statement, but a few kinds are throw directly by the JVM, zero divide or NullPointerExceptions being examples.
If you need to throw an exception you typically create an exception class of your own, by extending the Exception class. That way you can have a catch clause that catches just that one kind of exception and your program can act accordingly.

This is regarding "throw exceptions" in Java

Hi, I have Queue class and a Test drive for the Queue class called QueueDriver. After I run the program I see a number which I have set in the QueueDrive shown up in the terminal window. How can I throw an exception here along with a message? what kind of exception would it be? IOException......OR FileNotFound exception.....OR is there a generic type of exception?
Thanks.

Queue class;
public class Queue
    private Object []items;
    private int max_items;
     private int next_free;
     private int next_full;
     public Queue(int _max_items)
         max_items = _max_items;
          items = new Object[max_items];
          next_free = next_full = 0;
     public void enqueue(Object it)
          items[next_free] = it;
          next_free = (next_free + 1) % max_items;
     // throw exception....
     public Object dequeue()
         Object rtn = items[next_full];
         next_full = (next_full + 1) % max_items;
         return rtn;
     // throw exception....
QueueDriver;
import Queue;
public class QueueDriver
    public static void main(String[] args)throws Exception;
        Queue int_queue = new Queue(50);
        try
            int_queue.enqueue(new Integer(12));
            int_queue.enqueue(new Integer(5));
            System.out.println((Integer) int_queue.dequeue());
           catch(QueueException e)
               System.out.println("Caught QueueException: " + e.getMessage());
}

HelloWorldApp throws Exception in Main

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