Command line runs it, Eclipse does not :-(

[Prosenjit Banerjee]

Happy New Year JavaRanchars,
I am not new in Java, but very new in Eclipse.

I am facing a problem that seems to be very simple and common. But for last 3 days it driving me nuts. Kindly get me off the bottle neck.

I have a directory structure as follows

   c:\
    |
    --> abcd
         |
         --> efgh
              |
              --> PbandPackage

Under PbandPackage I put one file called Tools.java having code as follows:

package PbandPackage ;
 
import java.awt.* ;
import javax.swing.* ;
import java.security.* ;
import java.util.* ;
 
public class Tools
{
public static int getRandom(int l, int u)
{
return (int) ((u - l+ 1) * Math.random() + l) ;
}
 
public static String justTest()
{
return "Just Test" ;
}
}

Now I have anther file named Test.java under path c:\JavaProgs havng code as follows:-

import PbandPackage.* ;
 
public class Test
{
    public static void main(String[] args)
    {
       System.out.println(Tools.justTest()) ;
    }
}

By the way, eclipse underlines the word Tools with red.

I have added the following build path to my project in eclipse: c:\abcd\efgh

But even doing so I cannot run the Test.java from eclipse. The following error occurs:

Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
Tools cannot be resolved
 
at Test.main(Test.java:7)

But I can run the file from writing the following commands:

> javac -classpath "c:\abcd\efgh;.;" Test.java
> java Test.java

But surprisingly enough the fact is that, just after succesfully run from command if I hit the run button from eclipse the folloing error comes:

Errors exist in required project(s)
<project name>
Proceed with launch?

If proceed now then I get the correct output.

Kindly tell me just where I am going wrong. Please.

[Manoj Agnihotri]

This errors is just because your class path is not configured correctly.

import PbandPackage.* ;
 
public class Test
{
    public static void main(String[] args)
    {
       System.out.println(Tools.justTest()) ;
    }
}

This code means PbandPackage must be at same level as Test Class.
Means :
-Test.class
-PbandPackage-Tools.class

or you can include class files in Project Class path :
Project Properties -> Build Path -> Libraries -> Add Class Folder
and Select Folder where you PbandPackage contains class file.

and now run your Tools.java file.



..........



But in case of Eclipse its very easy to create a Java Project.
1. Create a new Java Project
2. Create src folder for your project.
3. Create packages.
4. Import required classes by Pressing Ctrl + O
5. run your programs.

[Prosenjit Banerjee]

Originally posted by Prosenjit Banerjee:

I have added the following build path to my project in eclipse: c:\abcd\efgh

But even doing so I cannot run the Test.java from eclipse.

So, as I told, I added the path in the Build path. Still it does not run. Please tell me where am I going wrong.