Setup linux and java

I have a simple project in eclipse, and it is structure as follows



ApplicationTest
|
bin src
|
mainPkg
|
sampleTest.java


In the ApplicationTest directory I did the following command
javac -d bin -sourcepath src src/mainPkg/sampleTest.java

And it compiles

Then I execute
java /bin/mainPkg/sampleTest


And I get this...


Exception in thread "main" java.lang.NoClassDefFoundError: bin/mainPkg/sampleTest (wrong name: mainPkg/sampleTest)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java :800)
at java.security.SecureClassLoader.defineClass(Secure ClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader .java:449)
at java.net.URLClassLoader.access$100(URLClassLoader. java:71)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 361)
at java.net.URLClassLoader$1.run(URLClassLoader.java: 355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.j ava:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:4 25)
at sun.misc.Launcher$AppClassLoader.loadClass(Launche r.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:3 58)
at sun.launcher.LauncherHelper.checkAndLoadMain(Launc herHelper.java:482)


Then I specified the -cp flag, but I'm not sure which folder from the jdk directory the class path should point to.

I did this...

java -cp /home/user/My-Files/libraries/jdk1.7.0_45/bin/ bin/mainPkg/sampleTest

Then I get this

Error: Could not find or load main class bin.mainPkg.sampleTest

It's a different error, does that mean that I specified the classpath correctly??

Thanks a lot for your help.

If your class is "sampleTest" in a "mainPkg" package (which means sampleTest.java contains "package mainPkg;") after the compile you should end up with a file bin/mainPkg/sampleTest.class.

And to invoke it from the command line, the classpath should point to the "bin" directory and you designate the class as mainPkg.sampleTest, ie:

Code:

---

java -cp bin mainPkg.sampleTest

---

In other words:

• the class path items are the directories (or jar) just above the "root" packages
• class are designated by their full path, replacing directory separators by dots
• the package in the class should match its position

For instance if you have the following directory/file structure: a/b/c/d/e/Foo.class

• if Foo has no package then the classpath should include the directory a/b/c/d/e and the class is just "Foo"
• if Foo is declared in package "d.e" then the classpath should include the directory a/b/c and the class is d.e.Foo