Class.forName() -- class not found, why?


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Thread: Class.forName() -- class not found, why?

  1. #1
    Olivier Béghain Guest

    Class.forName() -- class not found, why?


    Hi,

    I'm actually trying to see how I could invoke instances of classes for which
    I known the name only at runtime. So I thought to use the "forName()" method
    of the "Class" class. Unfortunately, when running my test code, I always
    get an exception saying that the class could not be found. Anyone could give
    me a tip how to use that "forName" method.

    Here's my test code (2 classes):

    class RunMe {
    public static void main(String args[]) {
    try {
    System.out.println("Loading the class");
    Class oClass = Class.forName("LoadedClass.class");
    }
    catch (Exception e) {
    System.out.println(e);
    }
    }
    }


    class LoadedClass {
    public static void main(String args[]) {
    System.out.println("i'm the loaded class");
    }
    }

    I also tried to package the "LoadedClass.class" in a jar file, add it to
    my classpath but I got the same result.

    PS: Sorry if this is a stupid question, I'm starting to really look how to
    program in Java.

    Regards,
    -Olivier.

  2. #2
    Karthikeyan Guest

    Re: Class.forName() -- class not found, why?

    the problem is that you give the ".class" extension also. try without giving
    the extension it will work fine.

    the line should be
    Class oClass = Class.forName("LoadedClass");

    give the name of the class only

    Regards
    Karthikeyan.R

    "Olivier Béghain" <olivier.beghain@be.ibm.com> wrote in message
    news:3f1da343$1@tnews.web.devx.com...
    >
    > Hi,
    >
    > I'm actually trying to see how I could invoke instances of classes for

    which
    > I known the name only at runtime. So I thought to use the "forName()"

    method
    > of the "Class" class. Unfortunately, when running my test code, I always
    > get an exception saying that the class could not be found. Anyone could

    give
    > me a tip how to use that "forName" method.
    >
    > Here's my test code (2 classes):
    >
    > class RunMe {
    > public static void main(String args[]) {
    > try {
    > System.out.println("Loading the class");
    > Class oClass = Class.forName("LoadedClass.class");
    > }
    > catch (Exception e) {
    > System.out.println(e);
    > }
    > }
    > }
    >
    >
    > class LoadedClass {
    > public static void main(String args[]) {
    > System.out.println("i'm the loaded class");
    > }
    > }
    >
    > I also tried to package the "LoadedClass.class" in a jar file, add it to
    > my classpath but I got the same result.
    >
    > PS: Sorry if this is a stupid question, I'm starting to really look how to
    > program in Java.
    >
    > Regards,
    > -Olivier.




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