Can't load class with Class.forName()

Hi, can somebody help me with this problem. I have clas copiled with jdk 1.3.1 (I also test it with jdk 1.4.1). If I try to load a Class instance with Class.forName("package.app.MyClass)") I have a runtime exception:
java.lang.ClassNotFoundException: com.unisys.ebs.all.ispecs.GD130IspecModel
     at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:183)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:115)
     at com.unisys.util.ObjectLoader.load(ObjectLoader.java:60)
     at com.unisys.jellybeans.IspecFactory.getIspec(IspecFactory.java:74)
     at com.unisys.jellybeans.LINCEnvironment.getIspec(LINCEnvironment.java:1012)
     at com.unisys.ebs.middleware.TestLinc.initConnection(TestLinc.java:52)
     at com.unisys.ebs.middleware.TestLinc.main(TestLinc.java:106)
but if instead of this I instantiate the class calling the constructor and writing an import sentence, it works fine. I really need to instantiate this class via Class.forName because it extends a superclass and know the class to instantiate only at runtime. I will appreciate any help. Thanks.
Pablo Antonioletti

I removed the import in the file header and wrote this code:
try{
ispecModel = new com.unisys.ebs.all.ispecs.GD130IspecModel();
Class ispecClass = Class.forName("com.unisys.ebs.all.ispecs.GD130IspecModel.class");
catch(Exception e)
e.printStackTrace();
the new sentence work fine, if write mor code I can access methods and members. When the runtime execute the Class.forName sentence the exception is thrown. I put all in the same file and class to avoid mistakes typing class path.
This is very rare I never seen it before and I developed java application since five years ago.

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