Error: [...HelloWorld] is not a function, it is object

[anoopvarma-2000-p]

In Mirth connect 4.5.0, when I invoke a class from my jar file (from custom-lib folder), getting the following error:

ERROR  (com.mirth.connect.connectors.js.JavaScriptReceiver:195): Error executing JavaScript Reader script 5cd61f28-81d3-4a33-a060-2970b27739f9_JavaScript_Reader.
com.mirth.connect.server.util.javascript.JavaScriptExecutorException: com.mirth.connect.server.MirthJavascriptTransformerException: CHANNEL:
	HelloWorldCONNECTOR:
	SourceSOURCE CODE:
	105: //var hw = new hwClass(); // This will fail if class is not found106: //logger.info(hw.sayHello());107: 108: //logger.info("Engine: " + engine.getFactory().getEngineName());109: 110: var hw = new Packages.com.example.helloworld.HelloWorld();111: logger.info(hw.sayHello());112: 113: 114: //var hwClass1 = Java.type("com.example.helloworld.HelloWorld");LINE NUMBER:
	110DETAILS:
	TypeError: [JavaPackage com.example.helloworld.HelloWorld] is not a function, it is object.
	at 5cd61f28-81d3-4a33-a060-2970b27739f9_JavaScript_Reader:110 (doScript)
	at 5cd61f28-81d3-4a33-a060-2970b27739f9_JavaScript_Reader:126
	at com.mirth.connect.server.util.javascript.JavaScriptUtil.execute(JavaScriptUtil.java:79)
	at com.mirth.connect.connectors.js.JavaScriptReceiver.poll(JavaScriptReceiver.java:161)
	at com.mirth.connect.donkey.server.channel.PollConnectorJob.execute(PollConnectorJob.java:49)
	at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
	at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)Caused by: com.mirth.connect.server.MirthJavascriptTransformerException: CHANNEL:
	HelloWorldCONNECTOR:
	SourceSOURCE CODE:
	105: //var hw = new hwClass(); // This will fail if class is not found106: //logger.info(hw.sayHello());107: 108: //logger.info("Engine: " + engine.getFactory().getEngineName());109: 110: var hw = new Packages.com.example.helloworld.HelloWorld();111: logger.info(hw.sayHello());112: 113: 114: //var hwClass1 = Java.type("com.example.helloworld.HelloWorld");LINE NUMBER:
	110DETAILS:
	TypeError: [JavaPackage com.example.helloworld.HelloWorld] is not a function, it is object.
	at 5cd61f28-81d3-4a33-a060-2970b27739f9_JavaScript_Reader:110 (doScript)
	at 5cd61f28-81d3-4a33-a060-2970b27739f9_JavaScript_Reader:126
	at com.mirth.connect.server.util.javascript.JavaScriptUtil.executeScript(JavaScriptUtil.java:620)
	at com.mirth.connect.connectors.js.JavaScriptReceiver$JavaScriptReceiverTask.doCall(JavaScriptReceiver.java:235)
	at com.mirth.connect.server.util.javascript.JavaScriptTask.call(JavaScriptTask.java:114)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

The code used in the channel (Source: JavaScript Reader):

var hw = new Packages.com.example.helloworld.HelloWorld();
logger.info(hw.sayHello());

The source code of the jar file:

package com.example.helloworld;

public class HelloWorld {
    public HelloWorld() {
    }

    public String sayHello() {
        return "Hello, World!";
    }

    public String sayHello(String name) {
        return "Hello, " + name + "!";
    }

    public String sayHello(String name, String greeting) {
        return greeting + ", " + name + "!";
    }
}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>helloworld</artifactId>
    <version>1.0.4</version>
    <properties>
        <java.version>21</java.version>
        <maven.compiler.source>21</maven.compiler.source>
        <maven.compiler.target>21</maven.compiler.target>
    </properties>
</project>

Additional details:
Mirth Connect is running in a Docker container. The Image: nextgenhealthcare/connect:4.5.0
OpenJDK 21
Mirth Connect v4.5.0
The same setup works fine in a non-docker environment.

Please help to load the class properly, and print Hello World.
Thank you.