javac error: "package x does not exist" at "import x"

Question

I'm trying to compile my java file 'check4PrimeTest.java' using the command prompt with the following command:

javac -classpath .:junit.jar check4PrimeTest.java

I get the following error:

error: package junit.framework does not exist import junit.framework.*;

I'm not sure why i get this error as i have import junit.framework.* in my program.

below is my code:

package check4prime;
// check4PrimeTest.java

//Imports 
import junit.framework.*;

public class check4PrimeTest extends TestCase {

    //Initialize a class to work with. 
    private check4Prime check4prime = new check4Prime();

    //constructor 
    public check4PrimeTest (String name) { 
        super(name);
    }

    //Main entry point 
    public static void main(String[] args) {
        System.out.println("Starting test...");
        junit.textui.TestRunner.run(suite());
        System.out.println("Test finished...");
    } // end main() 

    //Test case 1 
    public void testCheckPrime_true() {
        assertTrue(check4prime.primeCheck(3));
    }

    //Test cases 2,3 
    public void testCheckPrime_false() {
        assertFalse(check4prime.primeCheck(0));
        assertFalse(check4prime.primeCheck(1000));
    }

    //Test case 7 
    public void testCheck4Prime_checkArgs_char_input() { 
        try {
            String [] args= new String[1];
            args[0]="r";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        }
    } //end testCheck4Prime_checkArgs_char_input() 

    //Test case 5 
    public void testCheck4Prime_checkArgs_above_upper_bound() {
        try { 
            String [] args= new String[1];
            args[0]="10001";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        }
    } // end testCheck4Prime_checkArgs_upper_bound() 

    //Test case 4 
    public void testCheck4Prime_checkArgs_neg_input() {
        try { 
            String [] args= new String[1];
            args[0]="-1";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        }
    } // end testCheck4Prime_checkArgs_neg_input()

    //Test case 6
    public void testCheck4Prime_checkArgs_2_inputs() {
        try { 
            String [] args= new String[2];
            args[0]="5";
            args[1]="99";
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
         } catch (Exception success) {
            //successful test 
         } 
    } // end testCheck4Prime_checkArgs_2_inputs 

    //Test case 8 
    public void testCheck4Prime_checkArgs_0_inputs() {
        try { 
            String [] args= new String[0];
            check4prime.checkArgs(args);
            fail("Should raise an Exception.");
        } catch (Exception success) { 
            //successful test
        } 
    } // end testCheck4Prime_checkArgs_0_inputs 

    //JUnit required method. 
    public static Test suite() { 
        TestSuite suite = new TestSuite(check4PrimeTest.class);
        return suite;
    } //end suite() 

} //end check4PrimeTest

Answer 1

You are getting this error because you're trying to import a package without telling your system where the package is located. Here are instructions on telling your system where the package is located:

Your javac target doesn't specify anything apart from the source and target directory - it doesn't add any classpath entries; you'll need to add an entry for the appropriate JUnit jar file. See the javac task documentation for more details. You may want to specify the path to JUnit as a classpath attribute, a nested element, or a reference to a path declared elsewhere.

• javac task documentation

Source: problem running JUnit tests with Ant in Eclipse. Beginner question

prompt> javac -classpath .;$JUNIT_HOME\junit4.x.x.jar test.java

EDIT: JUNIT INSTALLATION (from here):

Windows

To install JUnit on Windows, follow these steps:

1. Unzip the junit.zip distribution file to a directory referred to as %JUNIT_HOME%.

2. Add JUnit to the classpath (type the following into a command line shell): `set CLASSPATH=%CLASSPATH%;%JUNIT_HOME%\junit.jar`

Unix (bash)

To install JUnit on Unix, follow these steps:

1. Unzip the junit.zip distribution file to a directory referred to as $JUNIT_HOME.

2. Add JUnit to the classpath (type the following into terminal):

`export CLASSPATH=$CLASSPATH:$JUNIT_HOME/junit.jar`