Question

I have a java file Test.java (below) which uses Guava’s HashMultiMap (downloaded from http://code.google.com/p/guava-libraries/). I store both .java and .jar file in “C:\Program Files\Java\jdk1.6.0_25\bin” . And then from command prompt, I execute the commands:

javac -cp guava-11.0.2.jar Test.java

and

java -cp guava-11.0.2.jar Test

“javac -cp guava-11.0.2.jar Test.java” is executing and producing a .class file. However,”java -cp guava-11.0.2.jar Test” is not executing and giving following errors. Can anybody help me why this happening or a step by step procedure to run the given code. Thanks.

Error:

Test.java Code:

import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;

public class Test {
    public static void main(String[] args) {
        try {
            String key = "hello";
            Multimap myMap = HashMultimap.create();
            myMap.put(key, 1);
            myMap.put(key, 5000);
            System.out.println(myMap.get(key));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Answer 1

By putting Guava on the classpath, you’ve replaced the current directory as the classpath. Do this:

java -cp guava-11.0.2.jar;. Test

; is used as the path separator on Windows (it would be : on Unix) and . is for the current directory. So this basically says: “Run with a classpath of the Guava jar file and the currently directory, and execute the main method in the class called Test“

EDIT: I hadn’t spotted your second attempt – the problem with that is the use of a colon instead of a semi-colon as the path separator. It would be fine to use .;guava-11.0.2.jar instead.