Can't run my java programs
I installed J2SE v 1.4.2_04 SDK on my computer.
I'm using textpad to write my programs. After i'm done writing my programs in can compile them on textpad and javac in command prompt. But when i try to run my program using java HelloWorld and textpad I get this error...
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld .
And the program in just a simple helloworld progam.
Can anybody help me please?
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Hai to every one ..Iam new to java language ...am using windows xp operating system , i did not installed java language in my system .. how can i run a java program with out installing java language... Which files is requied to run java program..?
any one can help me??Hai to every one ..Iam new to java language ...am
using windows xp operating system , i did not
installed java language in my system .. how can i run
a java program with out installing java language...
you ... can ... not ... do ... this
Which files is requied to run java program..?
any one can help me??a JVM. Download it from sun's website.
[url http://java.sun.com/javase/downloads/index.jsp]Download JavaSE here -
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pls pls help me
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regards
maulik & riteshthis will run the java program in the background.It'll just use the Windows Java Console instead of the command-line console. It has nothing to do with running as a background process.
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Can I run my java program in windows environment?
How can i make my compiled java program run into windows environment?
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How can I run this java program? Please help.
I have jmf installed, sunone running , the file may be in the wrong directory.
It is in some directory nowhere near the java lang dir.
When I try to compile or build i cant. I'm off on a basic thing.
here is the code.
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Receiver;
import javax.sound.midi.MidiMessage;
import javax.sound.midi.ShortMessage;
import javax.sound.midi.SysexMessage;
public class MidiNote
/** Flag for debugging messages.
If true, some messages are dumped to the console
during operation.
private static boolean DEBUG = false;
public static void main(String[] args)
try {
// TODO: make settable via command line
int nChannel = 0;
int nKey = 0; // MIDI key number
int nVelocity = 0;
* Time between note on and note off event in
* milliseconds. Note that on most systems, the
* best resolution you can expect are 10 ms.
int nDuration = 0;
int nArgumentIndexOffset = 0;
String strDeviceName = null;
if (args.length == 4)
strDeviceName = args[0];
nArgumentIndexOffset = 1;
else if (args.length == 3)
nArgumentIndexOffset = 0;
else
printUsageAndExit();
nKey = Integer.parseInt(args[0 + nArgumentIndexOffset]);
nKey = Math.min(127, Math.max(0, nKey));
nVelocity = Integer.parseInt(args[1 + nArgumentIndexOffset]);
nVelocity = Math.min(127, Math.max(0, nVelocity));
nDuration = Integer.parseInt(args[2 + nArgumentIndexOffset]);
nDuration = Math.max(0, nDuration);
MidiDevice outputDevice = null;
Receiver receiver = null;
if (strDeviceName != null)
MidiDevice.Info info = getMidiDeviceInfo(strDeviceName, true);
if (info == null)
out("no device info found for name " + strDeviceName);
System.exit(1);
try
outputDevice = MidiSystem.getMidiDevice(info);
outputDevice.open();
catch (MidiUnavailableException e)
if (DEBUG) { out(e); }
if (outputDevice == null)
out("wasn't able to retrieve MidiDevice");
System.exit(1);
try
receiver = outputDevice.getReceiver();
catch (MidiUnavailableException e)
if (DEBUG) { out(e); }
else
/* We retrieve a Receiver for the default
MidiDevice.
try
receiver = MidiSystem.getReceiver();
catch (MidiUnavailableException e)
if (DEBUG) { out(e); }
if (receiver == null)
out("wasn't able to retrieve Receiver");
System.exit(1);
/* Here, we prepare the MIDI messages to send.
Obviously, one is for turning the key on and
one for turning it off.
MidiMessage onMessage = null;
MidiMessage offMessage = null;
try
onMessage = new ShortMessage();
offMessage = new ShortMessage();
((ShortMessage) onMessage).setMessage(ShortMessage.NOTE_ON, nChannel, nKey, nVelocity);
((ShortMessage) offMessage).setMessage(ShortMessage.NOTE_OFF, nChannel, nKey);
/* test for SysEx messages */
//byte[] data = { (byte) 0xF0, (byte) 0xF7, (byte) 0x99, 0x40, 0x7F, 0x40, 0x00 };
//onMessage = new SysexMessage();
//offMessage = new SysexMessage();
//onMessage.setMessage(data, data.length);
//offMessage = (SysexMessage) onMessage.clone();
catch (InvalidMidiDataException e)
if (DEBUG) { out(e); }
* Turn the note on
receiver.send(onMessage, -1);
* Wait for the specified amount of time
* (the duration of the note).
try
Thread.sleep(nDuration);
catch (InterruptedException e)
if (DEBUG) { out(e); }
* Turn the note off.
receiver.send(offMessage, -1);
* Clean up.
receiver.close();
if (outputDevice != null)
outputDevice.close();
} catch (Throwable t) {
out(t);
System.exit(0);
private static void printUsageAndExit()
out("MidiNote: usage:");
out(" java MidiNote [<device name>] <note number> <velocity> <duration>");
out(" <device name>\toutput to named device");
out(" -D\tenables debugging output");
System.exit(1);
private static void listDevicesAndExit(boolean forInput, boolean forOutput) {
if (forInput && !forOutput) {
out("Available MIDI IN Devices:");
else if (!forInput && forOutput) {
out("Available MIDI OUT Devices:");
} else {
out("Available MIDI Devices:");
MidiDevice.Info[] aInfos = MidiSystem.getMidiDeviceInfo();
for (int i = 0; i < aInfos.length; i++) {
try {
MidiDevice device = MidiSystem.getMidiDevice(aInfos);
boolean bAllowsInput = (device.getMaxTransmitters() != 0);
boolean bAllowsOutput = (device.getMaxReceivers() != 0);
if ((bAllowsInput && forInput) || (bAllowsOutput && forOutput)) {
out(""+i+" "
+(bAllowsInput?"IN ":" ")
+(bAllowsOutput?"OUT ":" ")
+aInfos[i].getName()+", "
+aInfos[i].getVendor()+", "
+aInfos[i].getVersion()+", "
+aInfos[i].getDescription());
catch (MidiUnavailableException e) {
// device is obviously not available...
if (aInfos.length == 0) {
out("[No devices available]");
System.exit(0);
e
* This method tries to return a MidiDevice.Info whose name
* matches the passed name. If no matching MidiDevice.Info is
* found, null is returned.
* If forOutput is true, then only output devices are searched,
* otherwise only input devices.
private static MidiDevice.Info getMidiDeviceInfo(String strDeviceName, boolean forOutput) {
MidiDevice.Info[] aInfos = MidiSystem.getMidiDeviceInfo();
for (int i = 0; i < aInfos.length; i++) {
if (aInfos[i].getName().equals(strDeviceName)) {
try {
MidiDevice device = MidiSystem.getMidiDevice(aInfos[i]);
boolean bAllowsInput = (device.getMaxTransmitters() != 0);
boolean bAllowsOutput = (device.getMaxReceivers() != 0);
if ((bAllowsOutput && forOutput) || (bAllowsInput && !forOutput)) {
return aInfos[i];
} catch (MidiUnavailableException mue) {}
return null;
private static void out(String strMessage)
System.out.println(strMessage);
private static void out(Throwable t)
t.printStackTrace();Please post your code using code tags.
When I try to compile or build i cant.What is your question? Exactly what error message do you get? -
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Can we run a java class in an external server ( other than application server and client system )?
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If this is the case I think you can call this web service from SAP and triger the execution of the application on the "external server".
SAP is behaving as a client in this case.
Another alternative:
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thanks
kamran ahmedHi Darryl.Burke
So your telling, we cannot run our Java Program when system shutdowns...In my application, when user has schedule for next days and he shutdown his PC. On the next day when System Started i should able to get back my schedule on the Specified time(I'm TimerTask class in Java)... How can i achieve this using Java? can u tell me clearly.. -
Error while running a Java Program
Can anyone help me,
I am getting the following error while running a Java program, Below is the exception thrown, please help.
java.nio.BufferOverflowException
at java.nio.Buffer.nextPutIndex(Buffer.java:425)
at java.nio.DirectByteBuffer.putChar(DirectByteBuffer.java:463)
at org.jetel.data.StringDataField.serialize(StringDataField.java:295)
at org.jetel.data.DataRecord.serialize(DataRecord.java:283)
at org.jetel.graph.DirectEdge.writeRecord(DirectEdge.java:216)
at org.jetel.graph.Edge.writeRecord(Edge.java:288)
at com.tcs.re.component.RESummer1.run(RESummer1.java:505)
java.nio.BufferOverflowException
at java.nio.Buffer.nextPutIndex(Buffer.java:425)
at java.nio.DirectByteBuffer.putChar(DirectByteBuffer.java:463)
at org.jetel.data.StringDataField.serialize(StringDataField.java:295)
at org.jetel.data.DataRecord.serialize(DataRecord.java:283)
at org.jetel.graph.DirectEdge.writeRecord(DirectEdge.java:216)
at org.jetel.graph.Edge.writeRecord(Edge.java:288)
at com.tcs.re.component.RECollectCont.run(RECollectCont.java:304)Ok, let's see. Write the following class:
public class Grunt {
public static void main(String[] args) {
System.out.println("Hello Mars");
}Save it as "C:\Grunt.java", compile by typing:
javac c:\Grunt.javaRun by typing:
java -classpath "C:\" GruntDoes it say "Hello Mars"? If yes, go back to your program and compare for differences (maybe you used the "package" statement?).
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Running a java program a set number of times
This is a general question. Is it possible to make a java program run only 5 times for the sake of arguement.
Basically I want to write a program that will give the user some flexibility when it will actually run another Java program, but I only want them to be able to say "not now' for a set number of times. When the last time comes the other program will launch. I was initially thinking of the Do Whilw loop, but this needs to work when the program is restarted.
Program starts, it has 5 times it will run before it does something else(doesn't really matter now I think). User takes option "Not Now" and the program ends, but warns the user this will run 4 more times before you will need to do something.
This process will repeat until the user takes the option "Ok install now" or the time limit expires and the install occurs anyway. Can someone point me in the right direction.ok I see so it's like one those programs that you download for free on the internet and they give you a set amount times to use it before you have to pay for it. but in this case when the number of times you use it equals 5 (or when the user clicks ok) a different java app will open automatically.
My first thought would be to Write a Serialized object to disk using objectOutputStream that stores the number of times the application has been opened. and each time the program runs it checks for the serialized object and then you can do something like what I posted before. of course if were worried about security the user could always look for the object and erase it, if so then I guess we would have to come up with another plan of attack
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Running a java program from an icon
I want to run my program from an icon on my desktop. I have a .bat file that I've built a shortcut to and it works.MY GUI program does display and run when I click on the icon. The problem is that the DOS window also shows up behind my GUI.
Is there anyway to prevent the DOS window from showing? Or is there another way to run a Java program without resorting to a DOS command line or running it through FORTE or another IDD?Chris's solution worked well, with one small problem. Once my GUI starts, it takes up the whole screen. Normally when I run it, it appears as a small window.
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Running a Java program at startup in Linux
Hello
How do I run a Java program at startup in Linux? I know in Windows I can put a .bat file in C:\Windows\Start Menu\Programs\StartUp\ directory, but in Linux I have no idea how it is done.
Thank you,
MihaiThis is really a Linux question, not Java.
And then it depends on the version of Linux you are using.
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Running a java program in a directory other than the current directory
How do I run a java program that's located in a directory other than the current directory?
There is a file Test.java in /dir1/subdir1. If my current directory is anywhere other than that directory, say /dir2/subdir2, I can compile Test.java by using:
javac -classpath /dir1/subdir1 /dir1/subdir1/Test.java
But when I try to run it with:
java -classpath /dir1/subdir1 /dir1/subdir1/Test
I get a java.lang.NoClassDefFoundError: \dir1\subdir1\Test
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Exception while Running a Java Program for UME.
Hi Experts,
I am trying to run a java program to acess UME. Its a sample to create user but all of my samples are throwing this exception in NWDS (Console).Can anyone tell me why is it throwing this exception .
com.sap.security.api.UMRuntimeException: UME factory 'com.sap.security.api.IUserFactory' cannot be accessed because UME initialization has not started yet.
Please check
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at com.sap.security.api.UMFactory.checkInitialized(UMFactory.java:1019)
at com.sap.security.api.UMFactory.getUserFactory(UMFactory.java:801)
at Search.main(Search.java:25)
Exception in thread "main"
Thanks in advance
SomilHi,
Earlier i faced the same exception when i tried to call the UME form Standalone java application,To resolve this i used stateless session bean approach. i follow the Below Mentioned Steps,
1:-- create an J2EE -- EJB module project.
2:-- Create stateless session bean and define the require methods ,implement Local and remote interface methods in your bean class.
3:-- refer the UME apis in EJB Projects build path.
4:-- Call UME in Bean class methods.Build the EJB project and Archive.
5:--Now create an Enterprise application Project ,Include the EJB module project to your EA Project by right clicking on EA project.Build EA project and EAR file
6:--Deploy the EAR file on your server.
7:--Now from your standalone java application include these two projects in Project tab of your Application.
8:--Lookup the stateless session bean in your java class by its default JNDI name ,Obtain remote or local Home interface,And execute the BEAN Method which deals with UME.
You can also refer this tutorial in some parts of it UME apis(like IUser,UMFactory) are used in Servelets and EJB ,You can download this tutorial source from SDN for your reference.
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/297f35cf-0201-0010-00b2-fe2f3e23d360
Siddharth
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