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?

Search the forum for "classpath"

Similar Messages

  • How can i run my java program with out java language

    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

  • How can i run my java program in background process?

    hi all,
    i am working on desktop monitoring so when i start my program on client machine that is visible to all but i want this program client not visible to all instead of this can be run in background process . so, nobody can see that.
    so, how i can do this ?
    pls pls help me
    thanks in advanced to helper
    regards
    maulik & ritesh

    this 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.
    Edit: though this might be exactly what the OP wants: not "background process" but "no DOS console".

  • Can I run my java program in windows environment?

    How can i make my compiled java program run into windows environment?
    What program will i use to be able to do that?

    1. Install the JRE.
    2. Go to the command line.
    3. Type something like java myClass or java -jar myJar.jar.
    You could also use one of the many java2exe (java to executable) programs floating out there.

  • How can I run a java program on Linux?

    I have JBuilder's IDE installed on my Linux partition and it works. However I don't know how to compile and test a program without it. Also I tried to install Limewire on Linux and although I've installed the Java SDK on the system. Once before I installed JBuilder and then JBuilder (I guess) installed it again. However it told me it couldn't find the Java Virtual Machine. Isn't this installed with the JDK? I am able to run programs through JBuilder so I can't see why I'd have a problem. Any answers to the above issues would be greatly appreciated.

    Go here and work out how to make a simple app to compile and run on the command line: http://java.sun.com/docs/books/tutorial/getStarted/cupojava/unix.html#2b
    (You should find the JDK from a directory under the jbuilder directory so use that and not the /usr/local/jdk1.4 in the example.)
    Then find the classes or source code of your project and do the same thing to it.

  • 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?

  • Can we run a java class in a external server through abap program?

    Dear Experts,
    Can we run a java class in an external server ( other than application server and client system )?
    I have tried running it in the client system through a program and it works.
    But i have the requirement of running it in another system. Can it be done?

    Hi,
    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:
    "have tried running it in the client system through a program and it works." please elaborate.
    Regards.

  • Can I write and run simple java programs in Xcode

    I need to write and run basic java programs on my mac. I would like to run it in Xcode, but I don't know how to set it up? Is there a way?

    Read the following discussion from last month on here:
    Can Xcode 4.5.1 compile/run java?

  • How can i run the java bean sample program download from OTN

    hello to all
    i have a p[roblem. i have downloaded the sample progam from oracle web site which is a java code that connect with the oracle and shows a form. how can i run the from.
    can any body help me pleaSEEE
    thanks
    kamran ahmed                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

    Hi 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?).
    Regards

  • 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
    Hope this helps

  • 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.
    not a big problem, I can reduce it easily after it starts. But does anyone know a way to make it come up in the reduced size it norally comes up in when I run it from my IDE?

  • 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,
    Mihai

    This is really a Linux question, not Java.
    And then it depends on the version of Linux you are using.
    Maybe this will help, otherwise you should try on a forum for your version of Linux.

  • 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
    Any thoughts?

    You need to specify just the name of the class you want to run. So java -classpath /dir1/subdir1 Test

  • 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
            UMFactory.isInitialized() before using UME functionality.
        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
    Somil

    Hi,
    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

Maybe you are looking for