Matlab - Build JAR for `javaclasspath`

After following several of examples like this Example 1 and Example 2, i am still unable to build my own JAR Java file for MATLAB (R2014).

For the Example 2, I can successfully create classes from the given JAR after adding myHelloArchive.jar it to the javaclasspath.

myHelloArchive.jar

javaclasspath

But from the given code for HelloWorld.java:

HelloWorld.java

// HelloWorld.java
public class HelloWorld{
public HelloWorld(){
setVersion(0);
}
public static void main(String args){
System.out.println("Hello World!");
}
public void setVersion(int aVersion){
if( aVersion < 0 ){
System.err.println("Improper version specified.");
}
else{
version = aVersion;
}
}
public int getVersion(){
return version;
}
private int version;
}


by running these system commands successfully, having both javac.exe and jar.exe in the system command path, and having HelloWorld.* in the current MATLAB folder:

javac.exe

jar.exe

HelloWorld.*

javac HelloWorld.java
jar cf HelloWorld.jar HelloWorld.class
>> javaaddpath('HelloWorld.jar')


I cannot create a class:

>> HelloWorld
Undefined function or variable 'HelloWorld'.


The running system command always works for the default main():

main()

java -jar HelloWorld.jar
HelloWorld!


Why the provided JAR suceeds and the JAR file I compile from the given code nor my own JARs do not work?

I am positive I built a JAR file previously from the Eclipse IDE, but for some reason I neither can reproduce that.

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