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Thread: "A Java Exception has occurred"

  1. #1
    Junior Member
    Join Date
    Aug 2014
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    Default "A Java Exception has occurred"

    Hi everyone! I hope you are doing great

    I'm new to both, the forum and JAVA. It's been three or four days since I've started programming in this language (I know C and C++ btw), so I'm a noob/beginner/you name it.

    So far, I've learnt how to make graphic applications among other basic staff. The thing is, I've created a program, A VERY BASIC PROGRAM that does simple math calculations and displays the results in a field text. Fortunately, it works pretty well... Buuuuuuuuuuuut if I build it (using netbeans), and try to run it in another computer, a message pops up saying what the title says... How did I solve this? By installing JDK in every single one.

    There must be a way to make it work without installing the JDK, but I just don't know how :C Please, I beg you, try to explain me how and as detailed as possible.

    Thanks in advance! and sorry if there are too many grammar mistakes, I'm not a native speaker.

    --- Update ---

    This pops up:

    Exception in thread "main" java.lang.NoClassDefFoundError: Calculadora_Porcenta
    Caused by: java.lang.ClassNotFoundException: Calculadora_Porcentajes.jar
    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)
    Could not find the main class: Calculadora_Porcentajes.jar. Program will exit.

    And this is my manifest:

    Manifest-Version: 1.0
    Ant-Version: Apache Ant 1.9.2
    Created-By: 1.8.0_11-b12 (Oracle Corporation)
    X-COMMENT: Main-Class will be added automatically by build
    Main-Class: calculadora_porcentajes.Calculadora_Porcentajes

  2. #2
    Super Moderator
    Join Date
    Jun 2013
    So. Maryland, USA
    My Mood
    Thanked 688 Times in 675 Posts

    Default Re: "A Java Exception has occurred"

    Welcome to the forum! Please read this topic to learn how to post code in code or highlight tags and other useful info for new members.

  3. #3
    Member jdv's Avatar
    Join Date
    Jul 2014
    This Land
    Thanked 5 Times in 5 Posts

    Default Re: "A Java Exception has occurred"

    Show us how you are running this code.

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