ECMA TypeError Java class call from Worklight adapter

I saw a number of questions on this issue, but no convincing answers. I find it difficult to call a Java class from my implementation of the Worklight adapter. I replaced my code with the code from the Java Worklight Java Adapter tutorial and it fails the same way. Also, I found an answer on the IBM website that says that the Java 1.7 compiler can cause this problem and use Java 1.6 instead. I have confirmed that my compiler in Eclipse is Java 1.6.

My Java classes start with com (e.g. com.worklight.customcode). I tried using public static methods (using the correct syntax), as well as instantiating the object and calling the method. As mentioned above, I also confirmed that I am using the Java 1.6 compiler.

:

:

function addTwoIntegers(a,b){
    return {
        result: com.worklight.customcode.Calculator1.addTwoIntegers(a,b)
    };
}

Java ( IBM Worklight):    com.worklight.customcode;

import java.util.logging.Logger;

public class Calculator1 {

    private final static Logger logger = Logger.getLogger(Calculator1.class.getName());

    public static int addTwoIntegers(int first, int second){
        logger.info("addTwoIntegers invoked");
        return first + second;
    }

    public int subtractTwoIntegers(int first, int second){
        logger.info("subtractTwoIntegers invoked");
        return first - second;
    }

}

:

TypeError: addTwoIntegers [JavaPackage com.worklight.customcode.Calculator1]. , "". (% 2FUsers% 2Fhome% 2Fdev% 2Fapp% 2Fappprj% 2Fadapters% 2Fadapter/-impl.js # 26)     FWLSE0101E: : null

:

• Ecma: TypeError:
• java
• https://www.ibm.com/developerworks/community/forums/html/topic?id=77777777-0000-0000-0000-000014867695