How do I invoke a Java static method from a DMN model? (Drools Business Central)

I am utilizing Business Central 7.40.0. When calling the static Java method std from a Drools Business Central DMN project or model, the following error is generated:

DMN: Error compiling Java function 'stdev' on node 'stdev': Error resolving external function as defined by: function(val) external { java: { class: ""com.sample.StandardDeviation"", method signature: ""std(java.lang.Number)"" }}...
Error compiling the referenced FEEL expression

I have:

1. Created Maven jar with static Java method-

package com.sample;

import java.math.BigDecimal;
    
public class StandardDeviation {
    
    public static BigDecimal std(Number val) {  
        return new BigDecimal(val.doubleValue() * 2);
    }
}

2. Imported Jar as Artifacts to Drools Business Central,

3. Added Dependency to DMN project

4. In my DMN model, I am calling static Java method inside 'stdev' BKM (business knowledge model) element. BKM with class and method signature

• class: "com.sample.StandardDeviation"

• method signature: "std(java.lang.Number)"

5. Saving BKM/DMN or building the model gives above error

What could be the issue? Am I doing anything incorrectly? How to check the logs in Drools Business Central?