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Itsik Dangoor
Front End Web Development Techdegree Student 5,330 Points**[solved]** Works good in Eclipse, and treehouse workspace but in Win7 cmd doesn't, WHY?
hi, I change the code to work at Eclipse program and run it successfully there. but I went to the command line in Win7 and tried to run it there and it did not work. javac command run good but executing the program with java command gave me error message:
my adjusted code for Eclipse that work fine:
package n2.usingYourNewTool;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class CodingThePrototype3 {
public static void main(String[] args) {
/* Some terms"
noun = Person, place or thing
verb = An action
adjective = A description used to modified or describe a noun
Enter your amazing code
*/
//__Name__ is a __djective__ __noun__. They are always __adverb__ __verb__.
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String firstName = null;
String adjective = null;
String noun = null;
String adverb = null;
String verb = null;
try {
System.out.println("What is your first name? ");
firstName = reader.readLine();
System.out.println("Enter an adjective: ");
adjective = reader.readLine();
System.out.println("Enter a noun: ");
noun = reader.readLine();
System.out.println("Enter an adverb: ");
adverb = reader.readLine();
System.out.println("Enter a verb ending with -ing: ");
verb = reader.readLine();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.print("Your Tree Story:\n--------------\n");
System.out.format("%s is a very %s %s. ", firstName, adjective, noun);
System.out.printf("They are always %s %s.\n", adverb, verb);
}
}
Thank you
6 Answers
Craig Dennis
Treehouse TeacherAre you in the right directory?
Craig Dennis
Treehouse TeacherTry running from:
cd "C:\Java Workspaces\TreeHouse - Learn Java\Java Basics\src\"
javac n2\usingYourNewTool\CodingThePrototype3.java
java n2.usingYourNewTool.CodingThePrototype3
The classpath will most likely look in the current directory.
Itsik Dangoor
Front End Web Development Techdegree Student 5,330 Pointsyes, I am at the right directory. here is the error message. [alt text](C:/Users/ItsikDangoor/Desktop/forum/1.jpg "error message")
C:\Java Workspaces\TreeHouse - Learn Java\Java Basics\src\n2\usingYourNewTool>javac CodingThePrototype3.java
C:\Java Workspaces\TreeHouse - Learn Java\Java Basics\src\n2\usingYourNewTool>java CodingThePrototype3
Exception in thread "main" java.lang.NoClassDefFoundError: CodingThePrototype3 (wrong name: n2/usingYourNewTool/CodingThePrototype3)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: CodingThePrototype3. Program will exit.
Itsik Dangoor
Front End Web Development Techdegree Student 5,330 Pointstried still the same error: sorry but the site is not uploading the picture of the error message, but this is the same error again: [alt text](C:/Users/ItsikDangoor/Desktop/Tree House/forum/2.jpg "error message")
C:\Java Workspaces\TreeHouse - Learn Java\Java Basics\src>javac CodingThePrototype3.java javac: file not found: CodingThePrototype3.java Usage: javac <options> <source files> use -help for a list of possible options
C:\Java Workspaces\TreeHouse - Learn Java\Java Basics\src>java CodingThePrototype3 Exception in thread "main" java.lang.NoClassDefFoundError: CodingThePrototype3 Caused by: java.lang.ClassNotFoundException: CodingThePrototype3 at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) Could not find the main class: CodingThePrototype3. Program will exit.
Craig Dennis
Treehouse TeacherSorry I updated it...try again
Itsik Dangoor
Front End Web Development Techdegree Student 5,330 Pointsit's working, thanks.
but the interesting 2 things:
- why I should go outside the file code folder to src folder and run the two commands.
- why I have to run the command java class path with period instead of backslash while javac not? (that's also in java language the path is written!)
thank you Craig
Craig Dennis
Treehouse TeacherYou used a package, so it will look in your classpath for n2.usingYourNewTool. Your classpath by default contains the current directory where you are executing your java executable. Because in your original attempt you were outside of the src directory, it couldn't find what you were talking about through normal class loading ways. It will search for those using a directory structure (or JARs, don't worry about this yet).
It's kind of confusing, and we never called java with a dotted name, but that is how you execute a class in a package that has a main method. This is why you don't need to add the .class extension when running the java command, you are really passing it a class name, not a file.
Sorry it's a little confusing, I'm working on a course on running things locally, so I hope to get this clear for everyone here very shortly.
Itsik Dangoor
Front End Web Development Techdegree Student 5,330 Pointsyea it's a bit confusing. it's more technical thing to know how to control , not proper programming. But still it is important to know in order not to get stuck or learn how to manage in general in other systems.
I will look forward for your course in those subjects.
thank you