Question

I have Simple java program named MainController.java. Wehn I try to compile it from the directory where I have stored my MainController.java file by writing javac MAinController.java, it compiles properly and generates MainController.class file in the same directory. Now
1) when I try to run the file by writing “java MainController”, it gives me

Exception in thread "main" java.lang.NoClassDefFoundError: MainController (wrong name: cased/test/MainController)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    Could not find the main class: MainController. Program will exit.
    ragini@ragini-ThinkPad-W500:~/workspace/Test/src/cased/test$ 

I know there is some problem with my classpath. How do I set ? I want that when I run command “java MainController” from the directory where there is Maincontroller.class file, it should run it. I dont want to pass -cp parameter to java command each time I want to run it.

For jvm info I ran “java -version” and it displays following:

java version “1.6.0_22”
OpenJDK Runtime Environment (IcedTea6 1.10.6) (6b22-1.10.6-0ubuntu1)
OpenJDK Server VM (build 20.0-b11, mixed mode)

Please tell me how to set classpath variable and what it to set for above jvm.

Thank you in advance.

Answer 1

You need to add the package name when you execute MainController. From your ~workspace/Test/src directory, execute the following:

javac cased/test/MainController.java
java cased.test.MainController