Dear Geertjan, OK, I've read up on modules and written my first Hello World program which compiles and runs fine using NetBeans. However, it doesn't run from a command line, even after I've removed the mistakes in the Ant-generated suggestion:
D:\>"C:\Program Files\Java\jdk-12.0.1/bin/java" --module-path D:\Peter\Netbeans\TestModules1\build\modules com.ptoye.greetings.Main Picked up _JAVA_OPTIONS: -Djava.net.preferIPv4Stack=true Error: Could not find or load main class com.ptoye.greetings.Main Caused by: java.lang.ClassNotFoundException: com.ptoye.greetings.Main The main class is: package com.ptoye.greetings; ????import com.ptoye.astro.World; ??public class Main {?? public static void main(String[] args) { ?? System.out.format("Greetings %s!%n", World.name()); ?? } ??}?? Where does one go from here? I'm using the Oracle version of Java, Would OpenJDK make any difference? AFAICS it's the same. Thanks for the mailing list link. I looked at them but they all seem to be oriented towards people developing OpenJDK rather than users. There isn't a "support" or "help" link on the OpenJDK site. Best regards, Peter mailto:netbe...@ptoye.com www.ptoye.com ------------------------- Monday, October 14, 2019, 10:18:27 AM, you wrote: On Mon, Oct 14, 2019 at 11:16 AM Peter Toye <netbe...@ptoye.com> wrote: Dear Geertjan, I agree that the "java" command has nothing to do with Netbeans. I'll try to be more explicit: I have a project which dates back to about 2006 and has a main class which I'll call A. This uses a separate class B which I developed separately. I included B as a library using A's project properties. Using Netbeans 8 (and earlier) it was possible to run the project using a command line like java -jar A.jar and the program ran. The Java version was 1.8. The path to the Java executable is in my PATH. Earlier this year I wanted to develop it further, and decided to move to the latest version of NetBeans (11.1) and Java (12). Now the command line as given in the build output is C:\Program Files\Java\jdk-12.0.1/bin/java -cp directory\A.jar;directory\B.jar classpath.A My main point is that I don't understand how or why this has changed. https://openjdk.java.net/projects/jigsaw/ There is now a module system in Java, meaning that there is now a module path and a class path. That was not there in JDK 8 and is now there since then. Can you join the Java mailing lists and discuss further there: https://mail.openjdk.java.net/mailman/listinfo Gj