Below is what I tried in linux terminal: compiled Test.java, run Test.class, and got an error. Then, I tried the same command with "-classpath ." option and "-cp ." option, but also failed.
/testpackage$ cat Test.java
package testpackage;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("May I take your order?");
}
}
/testpackage$ javac Test.java
/testpackage$ java testpackage.Test
Exception in thread "main" java.lang.NoClassDefFoundError: testpackage/Test
Caused by: java.lang.ClassNotFoundException: testpackage.Test
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: testpackage.Test. Program will exit.
/testpackage$ java -cp . testpackage.Test
Exception in thread "main" java.lang.NoClassDefFoundError: testpackage/Test
Caused by: java.lang.ClassNotFoundException: testpackage.Test
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: testpackage.Test. Program will exit.
/testpackage$ java -classpath . testpackage.Test
Exception in thread "main" java.lang.NoClassDefFoundError: testpackage/Test
Caused by: java.lang.ClassNotFoundException: testpackage.Test
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: testpackage.Test. Program will exit.
/testpackage$
But if I remove the package "testpackage" and recompile the source code, the resulting class file is executed well.
/testpackage$ cat Test.java
//package testpackage;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("May I take your order?");
}
}
/testpackage$ javac Test.java
/testpackage$ java Test
May I take your order?
/testpackage$
What's wrong with my code, or execution command? Please help me. Thank you. :)
You need to run the commands from one directory higher.
A class in package foo
must live in directory foo
. Package foo.bar
must be in directory foo/bar
and so on.
So, your structure should have a file called /path/to/code/testpackage/Test.java
and your working directory should be /path/to/code
. You can then run:
javac testpackage/Test.java
java -cp . testpackage.Test
and everything should work.