NoClassDefFoundError

[nirjari patel]

I have set path variable as "C:\glassfish3\jdk\bin\java" but its not working. SO I am giving complete path on command line. WHen I compile as "C:\>c:\glassfish3\jdk\bin\javac C:\Users\Admin\Desktop\jsp\ReadAndWriteFromFile.java" File is getting compiled and class file getting generated in jsp dir.

Now when I try to run this class file as follows, I am getting error.

C:\>glassfish3\jdk\bin\java Users\Admin\Desktop\jsp\ReadAndWriteFromFile
Exception in thread "main" java.lang.NoClassDefFoundError: Users\Admin\Desktop\j
sp\ReadAndWriteFromFile (wrong name: ReadAndWriteFromFile)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: Users\Admin\Desktop\jsp\ReadAndWriteFromFile.  Program will exit.

Why am I getting such an error ? Why is path variable not getting set ? Whats this glassfish ? Can I not download jdk6 without glassfish ?

Thanks

[Wouter Oet]

I think you're confusing the path and the classpath variables. I would advise you to read about them and not to use the classpath environment variable.

[nirjari patel]

Where does the question of PATH and CLASSATH arise, when I am giving complete path on command line for the class file ?

[Jesper de Jong]

C:\>glassfish3\jdk\bin\java Users\Admin\Desktop\jsp\ReadAndWriteFromFile
Exception in thread "main" java.lang.NoClassDefFoundError: Users\Admin\Desktop\jsp\ReadAndWriteFromFile (wrong name: ReadAndWriteFromFile)

You're using the java command in the wrong way.

With the java command, you have to specify the fully-qualified class name of the class you are running, and not a file path. Use the classpath to specify which directories and JAR files Java must look in to find your class. Try this:

java -cp Users\Admin\Desktop\jsp ReadAndWriteFromFile

Glassfish is Oracle's reference implementation of the Java EE standard. Ofcourse you can download JDK 6 without Glassfish. But if you want to run JSPs, you do need a web container (you can't run JSPs with Java SE 6 alone).

[nirjari patel]

I installed Java EE from sun.java.com with glassfish and then I was trying to open a page which required Java. I was getting error "Java is not installed". I clicked on the link that came alongwith message and it led me to java.com. I installed java from that link again and it started working. SO whats going on over here ? Why is Java EE not getting installed ? If its not getting installed, why am I not getting an error message and instead I am getting message "installation successful" ? How can I install Java EE , if its not working from java.sun.com ?

Thanks