Page 1 of 2 12 LastLast
Results 1 to 20 of 40
Like Tree1Likes

Thread: Could not find the main class, program will exit.

  1. #1
    aryubi is offline Member
    Join Date
    Jul 2007
    Location
    in Hamburg, Germany
    Posts
    4
    Rep Power
    0

    Default Could not find the main class, program will exit.

    hello everybody,

    I have a problem:
    1. I install jdk 6 update 2 and jre 6 update 2
    2. I enter "C:\Program Files\Java\jdk1.6.0_02\bin" in path of systemvarible
    3. I wrot Hello.java as follow:

    Java Code:
    /* Hello.java */
    
    public class Hello
    {
    public static void main(String[] args)
    {
    System.out.println("Hello, world");
    }
    }
    4. I change in the Hello.java directory in Dos Window under Windows XP
    5. I type java -version and every things ok but as i type javaw Hello.java
    I got this message from Java Virtual Machine Launcher:
    Cold not find the main class, program will exit.
    can somebody help me?
    thanks
    Last edited by levent; 07-26-2007 at 07:15 PM. Reason: Code placed inside [code] tag.

  2. #2
    levent Guest

    Default

    4.1. Run "javac Hello.java" to obtain Hello.class file. (Compiling step)
    5. Instead of typing "javaw Hello.java", try "java Hello"

    Note: And please place your code inside [code] tag next time!

  3. #3
    Sircedric88 is offline Member
    Join Date
    Jul 2007
    Location
    Las Vegas
    Posts
    14
    Rep Power
    0

    Default

    You should use Eclipse
    Eclipse.org

  4. #4
    aryubi is offline Member
    Join Date
    Jul 2007
    Location
    in Hamburg, Germany
    Posts
    4
    Rep Power
    0

    Default

    thanks, I change the comand javac with javac. it works.

  5. #5
    aryubi is offline Member
    Join Date
    Jul 2007
    Location
    in Hamburg, Germany
    Posts
    4
    Rep Power
    0

    Default

    I mean javac with javaw naturly

  6. #6
    cruxblack is offline Senior Member
    Join Date
    Jul 2007
    Posts
    130
    Rep Power
    0

    Default

    Java Code:
    You should use Eclipse
    Eclipse.org
    Thats not a solution u know, is this supposed to be some kinda ads?
    It's not very helpful for begginers to use an IDE without understanding concept

    @Aryubi, compile with javac first, then run it using java
    Last edited by cruxblack; 07-27-2007 at 09:41 AM.
    Josep_16 likes this.

  7. #7
    Sircedric88 is offline Member
    Join Date
    Jul 2007
    Location
    Las Vegas
    Posts
    14
    Rep Power
    0

    Default

    Haha, well are you just running your programs from the command prompt?
    Cuz, I find that to not debug well, it doesn't help you out and is not very organized.

    Go to Eclipse.org, and if you want, I could walk you through the steps of installing the program and the IDE

  8. #8
    cruxblack is offline Senior Member
    Join Date
    Jul 2007
    Posts
    130
    Rep Power
    0

    Default

    Maybe u should poll in this thread, check it out

    Notepad or IDE?

    Running from command prompt does help me from being to spoiled with all the helpful tools though, helps me code more organized, and the trial and error debug makes me realize not only the errors i made, but also the errors i might made
    Btw, i had a netbeans, but still, cmd works well for now thank u:cool:

  9. #9
    brianhks is offline Senior Member
    Join Date
    Jul 2007
    Posts
    135
    Rep Power
    0

    Default

    I'm not certain this was answered well. Here are the steps:
    >javac Hello.java
    >java -cp . Hello

    The -cp . tells the JVM that the current directory is in the classpath.

  10. #10
    rajesh2732 is offline Member
    Join Date
    Apr 2008
    Posts
    1
    Rep Power
    0

    Default hi

    hi
    while try to access borland star team
    i got the error message like colud find the main call. program will exit
    can any body help me in this

  11. #11
    brianhks is offline Senior Member
    Join Date
    Jul 2007
    Posts
    135
    Rep Power
    0

    Default More detail please

    Please give us some more detail as to what you are doing? Like: sample of your main class. any commands you are using to build/run your application?

  12. #12
    Eranga's Avatar
    Eranga is offline Moderator
    Join Date
    Jul 2007
    Location
    Colombo, Sri Lanka
    Posts
    11,372
    Blog Entries
    1
    Rep Power
    20

    Default

    Hi rajesh2732,

    Welcome to our community. :)

    When you ask a question next time please provide enough details. So others can give a help to you easily. I think at the same time better to read our FAQ page before posting next.

    Best of luck with our community.

  13. #13
    Zosden's Avatar
    Zosden is offline Senior Member
    Join Date
    Apr 2008
    Posts
    384
    Rep Power
    7

    Default

    For beginners, I recommend writing everything in notepad. This helps for you to learn the basics, and once again I'm going to recommend my java tutorial its not complete, but it will last you about a week if you read it all. My webpage
    please give back some helpful feedback if you can.
    My IP address is 127.0.0.1

  14. #14
    GhosT's Avatar
    GhosT is offline Member
    Join Date
    Sep 2008
    Location
    Dhaka, Bangladesh
    Posts
    37
    Rep Power
    0

    Default

    make a batch file and place it in the same directory of your program...

    Java Code:
    cd\
    M:             \\Replace it by the drive ur file is in ie C:
    cd YourJavaFilePath
    javac FileName.java
    java FileName>results.txt
    so all u need to do is open the text file and check the results...once u make a batch file u can copy paste it to make others...

    example: this batch runs M:\JavaServerClientProgram\LocalScan.java and gives output in results.txt
    Java Code:
    cd\
    M:
    cd JavaServerClientProgram
    javac LocalScan.java
    java LocalScan>results.txt
    Last edited by GhosT; 09-29-2008 at 11:13 PM.

  15. #15
    jgcube is offline Member
    Join Date
    Dec 2008
    Posts
    5
    Rep Power
    0

    Default

    I had the same error today, when im trying to debug my application with (Run as Java Application) they are giving me the error : ''Could not find the main class. The program will exit.'' This error is applied to every applications I had (and always worked before) and all these application have a Main Class. I didnt change the settings or my Eclipse version. :confused:
    Give me some feedback plz.

  16. #16
    xcallmejudasx's Avatar
    xcallmejudasx is offline Senior Member
    Join Date
    Oct 2008
    Location
    Houston, TX & Flint, MI
    Posts
    609
    Rep Power
    6

    Default

    It might have something to do with the workspace. Are you 100% positive the workspace is the same as before? I loaded a project on a flash drive into eclipse and it changed my workspace to the flashdrive so no programs stored on my harddrive would run even though it said the workspace was my harddrive.

  17. #17
    jgcube is offline Member
    Join Date
    Dec 2008
    Posts
    5
    Rep Power
    0

    Default

    Yes I am sure im in the good workspace. I think the whole error description could help you to find my problem, and I think this is an Eclipse version problem.
    There's the error description :

    java.lang.UnsupportedClassVersionError: Bad version number in .class file
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknow n Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClassInternal(Unknown Source)

  18. #18
    xcallmejudasx's Avatar
    xcallmejudasx is offline Senior Member
    Join Date
    Oct 2008
    Location
    Houston, TX & Flint, MI
    Posts
    609
    Rep Power
    6

    Default

    I have never even heard of an UnsupportedClassVersionError.

    Try deleting all the .class files and just recompiling. Go oldschool and break out javac if it still doesn't work.

    What version of Eclipse are you using? Have you tested it on a newer or older version?

  19. #19
    jgcube is offline Member
    Join Date
    Dec 2008
    Posts
    5
    Rep Power
    0

    Default

    Im using the compiler version 1.6

  20. #20
    jgcube is offline Member
    Join Date
    Dec 2008
    Posts
    5
    Rep Power
    0

    Default

    Recompiling the .class file doesnt work and I cant either create a new project with a single class with a main without this error.
    Should I uninstall then install a new eclispe?

Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 2
    Last Post: 09-22-2011, 09:48 PM
  2. Replies: 8
    Last Post: 04-22-2008, 03:21 AM
  3. Replies: 1
    Last Post: 08-07-2007, 06:16 AM
  4. problems to find the main method
    By christina in forum Eclipse
    Replies: 2
    Last Post: 08-06-2007, 07:51 PM
  5. How to exit the program..
    By coco in forum New To Java
    Replies: 1
    Last Post: 08-01-2007, 05:56 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •